Initial commit

.gitignore

@@ -0,0 +1,141 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+.DS_Store
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.*
+!.env.example
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Sveltekit cache directory
+.svelte-kit/
+
+# vitepress build output
+**/.vitepress/dist
+
+# vitepress cache directory
+**/.vitepress/cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# Firebase cache directory
+.firebase/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v3
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Vite logs files
+vite.config.js.timestamp-*
+vite.config.ts.timestamp-*

LICENSE

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+This program is offered under a commercial and under the AGPL license.
+You can be released from the requirements of the AGPL license by purchasing
+a commercial license. Buying such a license is mandatory as soon as you
+develop commercial activities involving Zen by Aikido software without
+disclosing the source code of your own applications. These activities include
+but are not limited to: offering paid services to customers in a web application
+or shipping Aikido with a closed source product.
+
+For more information, please contact Aikido Security at this
+address: support@aikido.dev or create an account at https://app.aikido.dev.
+
+For AGPL licensing, see below.
+
+GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
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+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
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+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
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+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
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+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
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+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
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+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
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+code of the modified version.
+
+  An older license, called the Affero General Public License and
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+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1 +1,70 @@
-# safe-chain
+# Aikido Safe Chain
+
+The Aikido Safe Chain **prevents developers from installing malware** on their workstations through npm, npx, or yarn.
+
+The Aikido Safe Chain wraps around the [npm cli](https://github.com/npm/cli), [npx](https://github.com/npm/cli/blob/latest/docs/content/commands/npx.md), and [yarn](https://yarnpkg.com/) to provide extra checks before installing new packages. This tool will detect when a package contains malware and prompt you to exit, preventing npm, npx, or yarn from downloading or running the malware.
+
+![demo](https://aikido-production-staticfiles-public.s3.eu-west-1.amazonaws.com/safe-pkg.gif)
+
+Aikido Safe Chain works on Node.js version 18 and above and supports the following package managers:
+
+- ✅ **npm**
+- ✅ **npx**
+- ✅ **yarn**
+- 🚧 **pnpm** Coming soon
+
+# Usage
+
+## Installation
+
+Installing the Aikido Safe Chain is easy. You just need 3 simple steps:
+
+1. **Install the Aikido Safe Chain package globally** using npm:
+   ```shell
+   npm install -g @aikidosec/safe-chain
+   ```
+2. **Setup the shell integration** by running:
+   ```shell
+   safe-chain setup
+   ```
+3. **❗Restart your terminal** to start using the Aikido Safe Chain.
+   - This step is crucial as it ensures that the shell aliases for npm, npx, and yarn are loaded correctly. If you do not restart your terminal, the aliases will not be available.
+4. **Verify the installation** by running:
+   ```shell
+   npm install eslint-js
+   ```
+   - The output should show that Aikido Safe Chain is blocking the installation of this package as it is flagged as malware.
+
+When running `npm`, `npx`, or `yarn` commands, the Aikido Safe Chain will automatically check for malware in the packages you are trying to install. If any malware is detected, it will prompt you to exit the command.
+
+## How it works
+
+The Aikido Safe Chain works by intercepting the npm, npx, and yarn commands and verifying the packages against **[Aikido Intel - Open Sources Threat Intelligence](https://intel.aikido.dev/?tab=malware)**.
+
+The Aikido Safe Chain integrates with your shell to provide a seamless experience when using npm, npx, and yarn commands. It sets up aliases for these commands so that they are wrapped by the Aikido Safe Chain commands, which perform malware checks before executing the original commands. We currently support:
+
+- ✅ **Bash**
+- ✅ **Zsh**
+- ✅ **Fish**
+- ✅ **PowerShell**
+- ✅ **PowerShell Core**
+
+More information about the shell integration can be found in the [shell integration documentation](docs/shell-integration.md).
+
+## Uninstallation
+
+To uninstall the Aikido Safe Chain, you can run the following command:
+
+1. **Remove all aliases from your shell** by running:
+   ```shell
+   safe-chain teardown
+   ```
+2. **Uninstall the Aikido Safe Chain package** using npm:
+   ```shell
+   npm uninstall -g @aikidosec/safe-chain
+   ```
+3. **❗Restart your terminal** to remove the aliases.
+
+# Usage in CI/CD
+
+🚧 Support for CI/CD environments is coming soon...

bin/aikido-npm.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+import { main } from "../src/main.js";
+import { initializePackageManager } from "../src/packagemanager/currentPackageManager.js";
+
+const packageManagerName = "npm";
+initializePackageManager(packageManagerName, process.versions.node);
+await main(process.argv.slice(2));

bin/aikido-npx.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+import { main } from "../src/main.js";
+import { initializePackageManager } from "../src/packagemanager/currentPackageManager.js";
+
+const packageManagerName = "npx";
+initializePackageManager(packageManagerName, process.versions.node);
+await main(process.argv.slice(2));

bin/aikido-yarn.js

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+
+import { main } from "../src/main.js";
+import { initializePackageManager } from "../src/packagemanager/currentPackageManager.js";
+
+const packageManagerName = "yarn";
+initializePackageManager(packageManagerName, process.versions.node);
+await main(process.argv.slice(2));

bin/safe-chain.js

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+
+import chalk from "chalk";
+import { ui } from "../src/environment/userInteraction.js";
+import { setup } from "../src/shell-integration/setup.js";
+import { teardown } from "../src/shell-integration/teardown.js";
+
+if (process.argv.length < 3) {
+  ui.writeError("No command provided. Please provide a command to execute.");
+  ui.emptyLine();
+  writeHelp();
+  process.exit(1);
+}
+
+const command = process.argv[2];
+
+if (command === "help" || command === "--help" || command === "-h") {
+  writeHelp();
+  process.exit(0);
+}
+
+if (command === "setup") {
+  setup();
+} else if (command === "teardown") {
+  teardown();
+} else {
+  ui.writeError(`Unknown command: ${command}.`);
+  ui.emptyLine();
+
+  writeHelp();
+
+  process.exit(1);
+}
+
+function writeHelp() {
+  ui.writeInformation(
+    chalk.bold("Usage: ") + chalk.cyan("safe-chain <command>")
+  );
+  ui.emptyLine();
+  ui.writeInformation(
+    `Available commands: ${chalk.cyan("setup")}, ${chalk.cyan(
+      "teardown"
+    )}, ${chalk.cyan("help")}`
+  );
+  ui.emptyLine();
+  ui.writeInformation(
+    `- ${chalk.cyan(
+      "safe-chain setup"
+    )}: This will setup your shell to wrap safe-chain around npm, npx and yarn.`
+  );
+  ui.writeInformation(
+    `- ${chalk.cyan(
+      "safe-chain teardown"
+    )}: This will remove safe-chain aliases from your shell configuration.`
+  );
+  ui.emptyLine();
+}

docs/shell-integration.md

@@ -0,0 +1,108 @@
+# Shell Integration
+
+## Overview
+
+The shell integration automatically wraps common package manager commands (`npm`, `npx`, `yarn`) with Aikido's security scanning functionality. This is achieved by adding shell aliases that redirect these commands to their Aikido-wrapped equivalents.
+
+## Supported Shells
+
+Aikido Safe Chain supports integration with the following shells.
+
+| Shell                  | Startup File                 | Alias Format               |
+| ---------------------- | ---------------------------- | -------------------------- |
+| **Bash**               | `~/.bashrc`                  | `alias npm='aikido-npm'`   |
+| **Zsh**                | `~/.zshrc`                   | `alias npm='aikido-npm'`   |
+| **Fish**               | `~/.config/fish/config.fish` | `alias npm "aikido-npm"`   |
+| **PowerShell Core**    | `$PROFILE`                   | `Set-Alias npm aikido-npm` |
+| **Windows PowerShell** | `$PROFILE`                   | `Set-Alias npm aikido-npm` |
+
+## Commands
+
+### Setup Shell Integration
+
+```bash
+safe-chain setup
+```
+
+This command:
+
+- Detects all supported shells on your system
+- Adds aliases for `npm`, `npx`, and `yarn` to each shell's startup file
+
+❗ After running this command, **you must restart your terminal** for the changes to take effect. This ensures that the aliases are loaded correctly.
+
+### Remove Shell Integration
+
+```bash
+safe-chain teardown
+```
+
+This command:
+
+- Detects all supported shells on your system
+- Removes Aikido aliases from each shell's startup file
+
+❗ After running this command, **you must restart your terminal** to restore the original commands.
+
+## File Locations
+
+The system modifies the following files based on your shell configuration:
+
+### Unix/Linux/macOS
+
+- **Bash**: `~/.bashrc`
+- **Zsh**: `~/.zshrc`
+- **Fish**: `~/.config/fish/config.fish`
+- **PowerShell Core**: `$PROFILE` (usually `~/.config/powershell/profile.ps1`)
+
+### Windows
+
+- **PowerShell**: Determined by `$PROFILE` variable
+- **PowerShell Core**: Also determined by `$PROFILE` variable
+
+## Troubleshooting
+
+### Common Issues
+
+**Aliases not working after setup:**
+
+- Make sure to restart your terminal
+- Check that the startup file was actually modified
+- Verify your shell is reading the correct startup file
+
+**Getting 'command not found: aikido-npm' error:**
+
+This means the aliases are working but the Aikido commands aren't installed or available in your PATH:
+
+- Make sure Aikido Safe Chain is properly installed on your system
+- Verify the `aikido-npm`, `aikido-npx`, and `aikido-yarn` commands exist
+- Check that these commands are in your system's PATH
+
+### Manual Verification
+
+To verify the integration is working, follow these steps:
+
+1. **Check if aliases were added to your shell startup file:**
+
+   - **For Bash**: Open `~/.bashrc` in your text editor
+   - **For Zsh**: Open `~/.zshrc` in your text editor
+   - **For Fish**: Open `~/.config/fish/config.fish` in your text editor
+   - **For PowerShell**: Open your PowerShell profile file (run `$PROFILE` in PowerShell to see the path)
+
+   Look for lines like:
+
+   - `alias npm='aikido-npm'` (Bash/Zsh)
+   - `alias npm "aikido-npm"` (Fish)
+   - `Set-Alias npm aikido-npm` (PowerShell)
+
+2. **Test that aliases are active in your terminal:**
+
+   After restarting your terminal, run these commands:
+
+   - `which npm` - Should show the path to `aikido-npm` instead of the original npm
+   - `npm --version` - Should show output from the Aikido-wrapped version
+   - `type npm` - Alternative way to check what command `npm` resolves to
+
+3. **If you need to remove aliases manually:**
+
+   Edit the same startup file from step 1 and delete any lines containing `aikido-npm`, `aikido-npx`, or `aikido-yarn`.

eslint.config.js

@@ -0,0 +1,25 @@
+import js from "@eslint/js";
+import { defineConfig } from "@eslint/config-helpers";
+import globals from "globals";
+import importPlugin from "eslint-plugin-import";
+
+export default defineConfig([
+  {
+    files: ["**/*.{js,mjs,cjs,ts}"],
+    plugins: { js },
+    extends: ["js/recommended"],
+  },
+  {
+    files: ["**/*.{js,mjs,cjs,ts}"],
+    languageOptions: { globals: globals.node },
+  },
+  importPlugin.flatConfigs.recommended,
+  {
+    files: ["**/*.{js,mjs,cjs}"],
+    languageOptions: {
+      ecmaVersion: "latest",
+      sourceType: "module",
+    },
+    rules: {},
+  },
+]);

package.json

@@ -0,0 +1,44 @@
+{
+  "name": "@aikidosec/safe-chain",
+  "version": "1.0.0",
+  "scripts": {
+    "test": "node --test --experimental-test-module-mocks **/*.spec.js",
+    "test:watch": "node --test --watch --experimental-test-module-mocks **/*.spec.js",
+    "lint": "eslint ."
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/AikidoSec/safe-chain.git"
+  },
+  "bin": {
+    "aikido-npm": "bin/aikido-npm.js",
+    "aikido-npx": "bin/aikido-npx.js",
+    "aikido-yarn": "bin/aikido-yarn.js",
+    "safe-chain": "bin/safe-chain.js"
+  },
+  "type": "module",
+  "keywords": [],
+  "author": "Aikido Security",
+  "license": "AGPL-3.0-or-later",
+  "description": "The Aikido Safe Chain wraps around the [npm cli](https://github.com/npm/cli), [npx](https://github.com/npm/cli/blob/latest/docs/content/commands/npx.md), [yarn](https://yarnpkg.com/), [pnpm](https://pnpm.io/), and [pnpx](https://pnpm.io/cli/dlx) to provide extra checks before installing new packages. This tool will detect when a package contains malware and prompt you to exit, preventing npm, npx, yarn, pnpm, or pnpx from downloading or running the malware.",
+  "dependencies": {
+    "@inquirer/prompts": "^7.4.1",
+    "abbrev": "^3.0.1",
+    "chalk": "^5.4.1",
+    "npm-registry-fetch": "^18.0.2",
+    "ora": "^8.2.0",
+    "semver": "^7.7.2"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.26.0",
+    "eslint": "^9.26.0",
+    "eslint-plugin-import": "^2.31.0",
+    "globals": "^16.1.0",
+    "typescript-eslint": "^8.32.0"
+  },
+  "main": "eslint.config.js",
+  "bugs": {
+    "url": "https://github.com/AikidoSec/safe-chain/issues"
+  },
+  "homepage": "https://github.com/AikidoSec/safe-chain#readme"
+}

src/api/aikido.js

@@ -0,0 +1,31 @@
+const malwareDatabaseUrl =
+  "https://malware-list.aikido.dev/malware_predictions.json";
+
+export async function fetchMalwareDatabase() {
+  const response = await fetch(malwareDatabaseUrl);
+  if (!response.ok) {
+    throw new Error(`Error fetching malware database: ${response.statusText}`);
+  }
+
+  try {
+    let malwareDatabase = await response.json();
+    return {
+      malwareDatabase: malwareDatabase,
+      version: response.headers.get("etag") || undefined,
+    };
+  } catch (error) {
+    throw new Error(`Error parsing malware database: ${error.message}`);
+  }
+}
+
+export async function fetchMalwareDatabaseVersion() {
+  const response = await fetch(malwareDatabaseUrl, {
+    method: "HEAD",
+  });
+  if (!response.ok) {
+    throw new Error(
+      `Error fetching malware database version: ${response.statusText}`
+    );
+  }
+  return response.headers.get("etag") || undefined;
+}

src/api/npmApi.js

@@ -0,0 +1,46 @@
+import * as semver from "semver";
+import * as npmFetch from "npm-registry-fetch";
+
+export async function resolvePackageVersion(packageName, versionRange) {
+  if (!versionRange) {
+    versionRange = "latest";
+  }
+
+  if (semver.valid(versionRange)) {
+    // The version is a fixed version, no need to resolve
+    return versionRange;
+  }
+
+  const packageInfo = await getPackageInfo(packageName);
+  if (!packageInfo) {
+    // It is possible that no version is found (could be a private package, or a package that doesn't exist)
+    // In this case, we return null to indicate that we couldn't resolve the version
+    return null;
+  }
+
+  const distTags = packageInfo["dist-tags"];
+  if (distTags && distTags[versionRange]) {
+    // If the version range is a dist-tag, return the version associated with that tag
+    // e.g., "latest", "next", etc.
+    return distTags[versionRange];
+  }
+
+  // If the version range is not a dist-tag, we need to resolve the highest version matching the range.
+  // This is useful for ranges like "^1.0.0" or "~2.3.4".
+  const availableVersions = Object.keys(packageInfo.versions);
+  const resolvedVersion = semver.maxSatisfying(availableVersions, versionRange);
+  if (resolvedVersion) {
+    return resolvedVersion;
+  }
+
+  // Nothing matched the range, return null
+  return null;
+}
+
+async function getPackageInfo(packageName) {
+  try {
+    return await npmFetch.json(packageName);
+  } catch {
+    return null;
+  }
+}

src/config/configFile.js

@@ -0,0 +1,91 @@
+import fs from "fs";
+import path from "path";
+import os from "os";
+import { ui } from "../environment/userInteraction.js";
+
+export function getScanTimeout() {
+  const config = readConfigFile();
+  return (
+    parseInt(process.env.AIKIDO_SCAN_TIMEOUT_MS) || config.scanTimeout || 10000 // Default to 10 seconds
+  );
+}
+
+export function writeDatabaseToLocalCache(data, version) {
+  try {
+    const databasePath = getDatabasePath();
+    const versionPath = getDatabaseVersionPath();
+
+    fs.writeFileSync(databasePath, JSON.stringify(data));
+    fs.writeFileSync(versionPath, version.toString());
+  } catch {
+    ui.writeWarning(
+      "Failed to write malware database to local cache, next time the database will be fetched from the server again."
+    );
+  }
+}
+
+export function readDatabaseFromLocalCache() {
+  try {
+    const databasePath = getDatabasePath();
+    if (!fs.existsSync(databasePath)) {
+      return {
+        malwareDatabase: null,
+        version: null,
+      };
+    }
+    const data = fs.readFileSync(databasePath, "utf8");
+    const malwareDatabase = JSON.parse(data);
+    const versionPath = getDatabaseVersionPath();
+    let version = null;
+    if (fs.existsSync(versionPath)) {
+      version = fs.readFileSync(versionPath, "utf8").trim();
+    }
+    return {
+      malwareDatabase: malwareDatabase,
+      version: version,
+    };
+  } catch {
+    ui.writeWarning(
+      "Failed to read malware database from local cache. Continuing without local cache."
+    );
+    return {
+      malwareDatabase: null,
+      version: null,
+    };
+  }
+}
+
+function readConfigFile() {
+  const configFilePath = getConfigFilePath();
+
+  if (!fs.existsSync(configFilePath)) {
+    return {};
+  }
+
+  const data = fs.readFileSync(configFilePath, "utf8");
+  return JSON.parse(data);
+}
+
+function getDatabasePath() {
+  const aikidoDir = getAikidoDirectory();
+  return path.join(aikidoDir, "malwareDatabase.json");
+}
+
+function getDatabaseVersionPath() {
+  const aikidoDir = getAikidoDirectory();
+  return path.join(aikidoDir, "version.txt");
+}
+
+function getConfigFilePath() {
+  return path.join(getAikidoDirectory(), "config.json");
+}
+
+function getAikidoDirectory() {
+  const homeDir = os.homedir();
+  const aikidoDir = path.join(homeDir, ".aikido");
+
+  if (!fs.existsSync(aikidoDir)) {
+    fs.mkdirSync(aikidoDir, { recursive: true });
+  }
+  return aikidoDir;
+}

src/environment/environment.js

@@ -0,0 +1,14 @@
+export function isCi() {
+  const ciEnvironments = [
+    "CI",
+    "TF_BUILD", // Azure devops does not set CI, but TF_BUILD
+  ];
+
+  for (const env of ciEnvironments) {
+    if (process.env[env]) {
+      return true;
+    }
+  }
+
+  return false;
+}

src/environment/userInteraction.js

@@ -0,0 +1,79 @@
+import chalk from "chalk";
+import ora from "ora";
+import { confirm as inquirerConfirm } from "@inquirer/prompts";
+import { isCi } from "./environment.js";
+
+function emptyLine() {
+  writeInformation("");
+}
+
+function writeInformation(message, ...optionalParams) {
+  console.log(message, ...optionalParams);
+}
+
+function writeWarning(message, ...optionalParams) {
+  if (!isCi()) {
+    message = chalk.yellow(message);
+  }
+  console.warn(message, ...optionalParams);
+}
+
+function writeError(message, ...optionalParams) {
+  if (!isCi()) {
+    message = chalk.red(message);
+  }
+  console.error(message, ...optionalParams);
+}
+
+function startProcess(message) {
+  if (isCi()) {
+    return {
+      succeed: (message) => {
+        writeInformation(message);
+      },
+      fail: (message) => {
+        writeError(message);
+      },
+      stop: () => {},
+      setText: (message) => {
+        writeInformation(message);
+      },
+    };
+  } else {
+    const spinner = ora(message).start();
+    return {
+      succeed: (message) => {
+        spinner.succeed(message);
+      },
+      fail: (message) => {
+        spinner.fail(message);
+      },
+      stop: () => {
+        spinner.stop();
+      },
+      setText: (message) => {
+        spinner.text = message;
+      },
+    };
+  }
+}
+
+async function confirm(config) {
+  if (isCi()) {
+    return Promise.resolve(config.default);
+  } else {
+    return inquirerConfirm({
+      message: config.message,
+      default: config.default,
+    });
+  }
+}
+
+export const ui = {
+  writeInformation,
+  writeWarning,
+  writeError,
+  emptyLine,
+  startProcess,
+  confirm,
+};

src/main.js

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+
+import { scanCommand, shouldScanCommand } from "./scanning/index.js";
+import { ui } from "./environment/userInteraction.js";
+import { getPackageManager } from "./packagemanager/currentPackageManager.js";
+
+export async function main(args) {
+  try {
+    if (shouldScanCommand(args)) {
+      await scanCommand(args);
+    }
+  } catch (error) {
+    ui.writeError("Failed to check for malicious packages:", error.message);
+  }
+
+  var result = getPackageManager().runCommand(args);
+  process.exit(result.status);
+}

src/packagemanager/currentPackageManager.js

@@ -0,0 +1,28 @@
+import { createNpmPackageManager } from "./npm/createPackageManager.js";
+import { createNpxPackageManager } from "./npx/createPackageManager.js";
+import { createYarnPackageManager } from "./yarn/createPackageManager.js";
+
+const state = {
+  packageManagerName: null,
+};
+
+export function initializePackageManager(packageManagerName, version) {
+  if (packageManagerName === "npm") {
+    state.packageManagerName = createNpmPackageManager(version);
+  } else if (packageManagerName === "npx") {
+    state.packageManagerName = createNpxPackageManager();
+  } else if (packageManagerName === "yarn") {
+    state.packageManagerName = createYarnPackageManager();
+  } else {
+    throw new Error("Unsupported package manager: " + packageManagerName);
+  }
+
+  return state.packageManagerName;
+}
+
+export function getPackageManager() {
+  if (!state.packageManagerName) {
+    throw new Error("Package manager not initialized.");
+  }
+  return state.packageManagerName;
+}

src/packagemanager/npm/createPackageManager.js

@@ -0,0 +1,83 @@
+import { commandArgumentScanner } from "./dependencyScanner/commandArgumentScanner.js";
+import { dryRunScanner } from "./dependencyScanner/dryRunScanner.js";
+import { nullScanner } from "./dependencyScanner/nullScanner.js";
+import { runNpm } from "./runNpmCommand.js";
+import {
+  getNpmCommandForArgs,
+  npmInstallCommand,
+  npmCiCommand,
+  npmInstallTestCommand,
+  npmInstallCiTestCommand,
+  npmUpdateCommand,
+  npmAuditCommand,
+  npmExecCommand,
+} from "./utils/npmCommands.js";
+
+export function createNpmPackageManager(version) {
+  const supportedScanners =
+    getMajorVersion(version) >= 22
+      ? npm22AndAboveSupportedScanners
+      : npm21AndBelowSupportedScanners;
+
+  function isSupportedCommand(args) {
+    const scanner = findDependencyScannerForCommand(supportedScanners, args);
+    return scanner.shouldScan(args);
+  }
+
+  function getDependencyUpdatesForCommand(args) {
+    const scanner = findDependencyScannerForCommand(supportedScanners, args);
+    return scanner.scan(args);
+  }
+
+  return {
+    getWarningMessage: () => warnForLimitedSupport(version),
+    runCommand: runNpm,
+    isSupportedCommand,
+    getDependencyUpdatesForCommand,
+  };
+}
+
+const npm22AndAboveSupportedScanners = {
+  [npmInstallCommand]: dryRunScanner(),
+  [npmUpdateCommand]: dryRunScanner(),
+  [npmCiCommand]: dryRunScanner(),
+  [npmAuditCommand]: dryRunScanner({
+    skipScanWhen: (args) => !args.includes("fix"),
+  }),
+  [npmExecCommand]: commandArgumentScanner({ ignoreDryRun: true }), // exec command doesn't support dry-run
+
+  // Running dry-run on install-test and install-ci-test will install & run tests.
+  // We only want to know if there are changes in the dependencies.
+  // So we run change the dry-run command to only check the install.
+  [npmInstallTestCommand]: dryRunScanner({ dryRunCommand: npmInstallCommand }),
+  [npmInstallCiTestCommand]: dryRunScanner({ dryRunCommand: npmCiCommand }),
+};
+
+const npm21AndBelowSupportedScanners = {
+  [npmInstallCommand]: commandArgumentScanner(),
+  [npmUpdateCommand]: commandArgumentScanner(),
+  [npmExecCommand]: commandArgumentScanner({ ignoreDryRun: true }), // exec command doesn't support dry-run
+};
+
+function warnForLimitedSupport(version) {
+  if (getMajorVersion(version) >= 22) {
+    return null;
+  }
+
+  return `Aikido-npm will only scan the arguments of the install command for Node.js version prior to version 22.
+Please update your Node.js version to 22 or higher for full coverage. Current version: v${version}`;
+}
+
+function getMajorVersion(version) {
+  return parseInt(version.split(".")[0]);
+}
+
+function findDependencyScannerForCommand(scanners, args) {
+  const command = getNpmCommandForArgs(args);
+  if (!command) {
+    return nullScanner();
+  }
+
+  const scanner = scanners[command];
+  return scanner ? scanner : nullScanner();
+}

src/packagemanager/npm/dependencyScanner/commandArgumentScanner.js

@@ -0,0 +1,37 @@
+import { resolvePackageVersion } from "../../../api/npmApi.js";
+import { parsePackagesFromInstallArgs } from "../parsing/parsePackagesFromInstallArgs.js";
+import { hasDryRunArg } from "../utils/npmCommands.js";
+
+export function commandArgumentScanner(opts) {
+  const ignoreDryRun = opts?.ignoreDryRun ?? false;
+
+  return {
+    scan: (args) => scanDependencies(args),
+    shouldScan: (args) => shouldScanDependencies(args, ignoreDryRun),
+  };
+}
+function scanDependencies(args) {
+  return checkChangesFromArgs(args);
+}
+
+function shouldScanDependencies(args, ignoreDryRun) {
+  return ignoreDryRun || !hasDryRunArg(args);
+}
+
+export async function checkChangesFromArgs(args) {
+  const changes = [];
+  const packageUpdates = parsePackagesFromInstallArgs(args);
+
+  for (const packageUpdate of packageUpdates) {
+    var exactVersion = await resolvePackageVersion(
+      packageUpdate.name,
+      packageUpdate.version
+    );
+    if (exactVersion) {
+      packageUpdate.version = exactVersion;
+    }
+
+    changes.push({ ...packageUpdate, type: "add" });
+  }
+  return changes;
+}

src/packagemanager/npm/dependencyScanner/dryRunScanner.js

@@ -0,0 +1,50 @@
+import { ui } from "../../../environment/userInteraction.js";
+import { parseDryRunOutput } from "../parsing/parseNpmInstallDryRunOutput.js";
+import { dryRunNpmCommandAndOutput } from "../runNpmCommand.js";
+import { hasDryRunArg } from "../utils/npmCommands.js";
+
+export function dryRunScanner(scannerOptions) {
+  return {
+    scan: (args) => scanDependencies(scannerOptions, args),
+    shouldScan: (args) => shouldScanDependencies(scannerOptions, args),
+  };
+}
+function scanDependencies(scannerOptions, args) {
+  let dryRunArgs = args;
+
+  if (scannerOptions?.dryRunCommand) {
+    // Replace the first argument with the dryRunCommand (eg: "install" instead of "install-test")
+    dryRunArgs = [scannerOptions.dryRunCommand, ...args.slice(1)];
+  }
+
+  return checkChangesWithDryRun(dryRunArgs);
+}
+
+function shouldScanDependencies(scannerOptions, args) {
+  if (hasDryRunArg(args)) {
+    return false;
+  }
+
+  if (scannerOptions?.skipScanWhen && scannerOptions.skipScanWhen(args)) {
+    return false;
+  }
+
+  return true;
+}
+
+function checkChangesWithDryRun(args) {
+  const dryRunOutput = dryRunNpmCommandAndOutput(args);
+
+  // Dry-run can return a non-zero status code in some cases
+  //  e.g., when running "npm audit fix --dry-run", it returns exit code 1
+  //  when there are vulnurabilities that can be fixed.
+  if (dryRunOutput.status !== 0 && !dryRunOutput.output) {
+    ui.writeError("Detecting changes failed.");
+    return [];
+  }
+
+  const parsedOutput = parseDryRunOutput(dryRunOutput.output);
+
+  // reverse the array to have the top-level packages first
+  return parsedOutput.reverse();
+}

src/packagemanager/npm/dependencyScanner/nullScanner.js

@@ -0,0 +1,6 @@
+export function nullScanner() {
+  return {
+    scan: () => [],
+    shouldScan: () => false,
+  };
+}

src/packagemanager/npm/parsing/parseNpmInstallDryRunOutput.js

@@ -0,0 +1,57 @@
+export function parseDryRunOutput(output) {
+  const lines = output.split(/\r?\n/);
+  const packageChanges = [];
+
+  for (const line of lines) {
+    if (line.startsWith("add ")) {
+      packageChanges.push(parseAdd(line));
+    } else if (line.startsWith("remove ")) {
+      packageChanges.push(parseRemove(line));
+    } else if (line.startsWith("change ")) {
+      packageChanges.push(parseChange(line));
+    }
+  }
+
+  return packageChanges;
+}
+
+function parseAdd(line) {
+  const splitLine = getLineParts(line);
+  const packageName = splitLine[1];
+  const packageVersion = splitLine[splitLine.length - 1];
+  return addedPackage(packageName, packageVersion);
+}
+
+function addedPackage(name, version) {
+  return { type: "add", name, version };
+}
+
+function parseRemove(line) {
+  const splitLine = getLineParts(line);
+  const packageName = splitLine[1];
+  const packageVersion = splitLine[splitLine.length - 1];
+  return removedPackage(packageName, packageVersion);
+}
+
+function removedPackage(name, version) {
+  return { type: "remove", name, version };
+}
+
+function parseChange(line) {
+  const splitLine = getLineParts(line);
+  const packageName = splitLine[1];
+  const packageVersion = splitLine[splitLine.length - 1];
+  const oldVersion = splitLine[2];
+  return changedPackage(packageName, packageVersion, oldVersion);
+}
+
+function getLineParts(line) {
+  return line
+    .split(" ")
+    .map((part) => part.trim())
+    .filter((part) => part !== "");
+}
+
+function changedPackage(name, version, oldVersion) {
+  return { type: "change", name, version, oldVersion };
+}

src/packagemanager/npm/parsing/parseNpmInstallDryRunOutput.spec.js

@@ -0,0 +1,134 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { parseDryRunOutput } from "./parseNpmInstallDryRunOutput.js";
+
+describe("parseNpmInstallDryRunOutput", () => {
+  it("should parse added packages", () => {
+    const output = `
+add @jest/transform 29.7.0
+add @jest/test-result 29.7.0
+add @jest/reporters 29.7.0
+add @jest/console 29.7.0
+add jest-cli 29.7.0
+add import-local 3.2.0
+add @jest/types 29.6.3
+add @jest/core 29.7.0
+add jest 29.7.0
+
+added 267 packages in 831ms
+
+32 packages are looking for funding
+  run \`npm fund\` for details`;
+
+    const expected = [
+      { name: "@jest/transform", version: "29.7.0", type: "add" },
+      { name: "@jest/test-result", version: "29.7.0", type: "add" },
+      { name: "@jest/reporters", version: "29.7.0", type: "add" },
+      { name: "@jest/console", version: "29.7.0", type: "add" },
+      { name: "jest-cli", version: "29.7.0", type: "add" },
+      { name: "import-local", version: "3.2.0", type: "add" },
+      { name: "@jest/types", version: "29.6.3", type: "add" },
+      { name: "@jest/core", version: "29.7.0", type: "add" },
+      { name: "jest", version: "29.7.0", type: "add" },
+    ];
+
+    const result = parseDryRunOutput(output);
+
+    assert.deepEqual(result, expected);
+  });
+
+  it("should parse removed packages", () => {
+    const output = `
+remove react 19.1.0
+
+    removed 1 package in 115ms`;
+
+    const expected = [{ name: "react", version: "19.1.0", type: "remove" }];
+
+    const result = parseDryRunOutput(output);
+
+    assert.deepEqual(result, expected);
+  });
+
+  it("should parse changed packages", () => {
+    const output = `
+change react 19.0.0 => 19.1.0
+
+changed 1 package in 204ms`;
+
+    const expected = [
+      {
+        name: "react",
+        version: "19.1.0",
+        oldVersion: "19.0.0",
+        type: "change",
+      },
+    ];
+
+    const result = parseDryRunOutput(output);
+
+    assert.deepEqual(result, expected);
+  });
+
+  it("should parse mixed package changes", () => {
+    const output = `
+add @jest/transform 29.7.0
+add @jest/test-result 29.7.0
+add @jest/reporters 29.7.0
+add @jest/console 29.7.0
+add jest-cli 29.7.0
+add import-local 3.2.0
+add @jest/types 29.6.3
+add @jest/core 29.7.0
+add jest 29.7.0
+remove react 19.1.0
+change lodash 4.17.0 => 4.18.0
+
+removed 1 package in 115ms`;
+
+    const expected = [
+      { name: "@jest/transform", version: "29.7.0", type: "add" },
+      { name: "@jest/test-result", version: "29.7.0", type: "add" },
+      { name: "@jest/reporters", version: "29.7.0", type: "add" },
+      { name: "@jest/console", version: "29.7.0", type: "add" },
+      { name: "jest-cli", version: "29.7.0", type: "add" },
+      { name: "import-local", version: "3.2.0", type: "add" },
+      { name: "@jest/types", version: "29.6.3", type: "add" },
+      { name: "@jest/core", version: "29.7.0", type: "add" },
+      { name: "jest", version: "29.7.0", type: "add" },
+      { name: "react", version: "19.1.0", type: "remove" },
+      {
+        name: "lodash",
+        version: "4.18.0",
+        oldVersion: "4.17.0",
+        type: "change",
+      },
+    ];
+
+    const result = parseDryRunOutput(output);
+
+    assert.deepEqual(result, expected);
+  });
+
+  it("should work with npm v22.0.0", () => {
+    const output = `
+add  @jest/types                                        29.6.3
+add  @jest/core                                         29.7.0
+add  jest                                               29.7.0
+
+added 257 packages in 791ms
+
+44 packages are looking for funding
+    run \`npm fund\` for details`;
+
+    const expected = [
+      { name: "@jest/types", version: "29.6.3", type: "add" },
+      { name: "@jest/core", version: "29.7.0", type: "add" },
+      { name: "jest", version: "29.7.0", type: "add" },
+    ];
+
+    const result = parseDryRunOutput(output);
+
+    assert.deepEqual(result, expected);
+  });
+});

src/packagemanager/npm/parsing/parsePackagesFromInstallArgs.js

@@ -0,0 +1,109 @@
+export function parsePackagesFromInstallArgs(args) {
+  const changes = [];
+  let defaultTag = "latest";
+
+  // Skip first argument (install command)
+  for (let i = 1; i < args.length; i++) {
+    const arg = args[i];
+    const npmOption = getNpmOption(arg);
+
+    if (npmOption) {
+      // If the option has a parameter, skip the next argument as well
+      i += npmOption.numberOfParameters;
+
+      // it a tag is specified, set the default tag
+      if (npmOption.name === "--tag") {
+        defaultTag = args[i];
+      }
+
+      continue;
+    }
+
+    const packageDetails = parsePackagename(arg);
+    if (packageDetails) {
+      changes.push(packageDetails);
+      continue;
+    }
+  }
+
+  for (const change of changes) {
+    if (!change.version) {
+      change.version = defaultTag;
+    }
+  }
+
+  return changes;
+}
+
+function getNpmOption(arg) {
+  if (isNpmOptionWithParameter(arg)) {
+    return {
+      name: arg,
+      numberOfParameters: 1,
+    };
+  }
+
+  // Arguments starting with "-" or "--" are considered npm options
+  if (arg.startsWith("-")) {
+    return {
+      name: arg,
+      numberOfParameters: 0,
+    };
+  }
+
+  return undefined;
+}
+
+function isNpmOptionWithParameter(arg) {
+  const optionsWithParameters = [
+    "--access",
+    "--auth-type",
+    "--cache",
+    "--fetch-retries",
+    "--fetch-retry-mintimeout",
+    "--fetch-retry-maxtimeout",
+    "--fetch-retry-factor",
+    "--fetch-timeout",
+    "--https-proxy",
+    "--include",
+    "--location",
+    "--lockfile-version",
+    "--loglevel",
+    "--omit",
+    "--proxy",
+    "--registry",
+    "--replace-registry-host",
+    "--tag",
+    "--user-config",
+    "--workspace",
+  ];
+
+  return optionsWithParameters.includes(arg);
+}
+
+function parsePackagename(arg) {
+  arg = removeAlias(arg);
+  const lastAtIndex = arg.lastIndexOf("@");
+
+  let name, version;
+  if (lastAtIndex !== -1) {
+    name = arg.slice(0, lastAtIndex);
+    version = arg.slice(lastAtIndex + 1);
+  } else {
+    name = arg;
+    version = null;
+  }
+
+  return {
+    name,
+    version,
+  };
+}
+
+function removeAlias(arg) {
+  const aliasIndex = arg.indexOf("@npm:");
+  if (aliasIndex !== -1) {
+    return arg.slice(aliasIndex + 5);
+  }
+  return arg;
+}

src/packagemanager/npm/parsing/parsePackagesFromInstallArgs.spec.js

@@ -0,0 +1,176 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { parsePackagesFromInstallArgs } from "./parsePackagesFromInstallArgs.js";
+
+describe("parsePackagesFromInstallArgs", () => {
+  it("should return an empty array for no changes", () => {
+    const args = ["install"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, []);
+  });
+
+  it("should return an array of changes for one package", () => {
+    const args = ["install", "@jest/transform@29.7.0"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "@jest/transform", version: "29.7.0" }]);
+  });
+
+  it("should return an array of changes for multiple packages", () => {
+    const args = ["install", "express@4.17.1", "lodash@4.17.21"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "4.17.1" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should ignore options and return an array of changes", () => {
+    const args = [
+      "install",
+      "--save-dev",
+      "express@4.17.1",
+      "--save-exact",
+      "lodash@4.17.21",
+    ];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "4.17.1" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should ignore options with parameters and return an array of changes", () => {
+    const args = [
+      "install",
+      "--save-dev",
+      "express@4.17.1",
+      "--loglevel",
+      "error",
+      "lodash@4.17.21",
+    ];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "4.17.1" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should not ignore the next argument if it is passed directly with the option", () => {
+    const args = [
+      "install",
+      "--save-dev",
+      "express@4.17.1",
+      "--loglevel=error",
+      "lodash@4.17.21",
+    ];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "4.17.1" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should set the default tag for packages", () => {
+    const args = ["install", "express", "lodash@4.17.21"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "latest" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should set the default tag for packages with a specific tag", () => {
+    const args = ["install", "express", "lodash@4.17.21", "--tag", "beta"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "express", version: "beta" },
+      { name: "lodash", version: "4.17.21" },
+    ]);
+  });
+
+  it("should ignore alias", () => {
+    const args = ["install", "express@npm:express@4.17.1"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "express", version: "4.17.1" }]);
+  });
+
+  it("should parse version even for aliased packages", () => {
+    const args = ["install", "express@npm:express@4.17.1"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "express", version: "4.17.1" }]);
+  });
+
+  it("should parse scoped packages", () => {
+    const args = ["install", "@scope/package@1.0.0"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "@scope/package", version: "1.0.0" }]);
+  });
+
+  it("should parse packages with version ranges", () => {
+    const args = ["install", "express@^4.17.1"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "express", version: "^4.17.1" }]);
+  });
+
+  it("should parse package folders", () => {
+    const args = ["install", "./local-package"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [{ name: "./local-package", version: "latest" }]);
+  });
+
+  it("should parse tarballs", () => {
+    const args = ["install", "file:./local-package.tgz"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "file:./local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse tarball URLs", () => {
+    const args = ["install", "https://example.com/local-package.tgz"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "https://example.com/local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse git URLs", () => {
+    const args = ["install", "git://github.com/npm/cli.git"];
+
+    const result = parsePackagesFromInstallArgs(args);
+
+    assert.deepEqual(result, [
+      { name: "git://github.com/npm/cli.git", version: "latest" },
+    ]);
+  });
+});

src/packagemanager/npm/runNpmCommand.js

@@ -0,0 +1,33 @@
+import { execSync } from "child_process";
+import { ui } from "../../environment/userInteraction.js";
+
+export function runNpm(args) {
+  try {
+    const npmCommand = `npm ${args.join(" ")}`;
+    execSync(npmCommand, { stdio: "inherit" });
+  } catch (error) {
+    if (error.status) {
+      return { status: error.status };
+    } else {
+      ui.writeError("Error executing command:", error.message);
+      return { status: 1 };
+    }
+  }
+  return { status: 0 };
+}
+
+export function dryRunNpmCommandAndOutput(args) {
+  try {
+    const npmCommand = `npm ${args.join(" ")} --dry-run`;
+    const output = execSync(npmCommand, { stdio: "pipe" });
+    return { status: 0, output: output.toString() };
+  } catch (error) {
+    if (error.status) {
+      const output = error.stdout ? error.stdout.toString() : "";
+      return { status: error.status, output };
+    } else {
+      ui.writeError("Error executing command:", error.message);
+      return { status: 1 };
+    }
+  }
+}

src/packagemanager/npm/utils/cmd-list.js

@@ -0,0 +1,171 @@
+// Based on https://github.com/npm/cli/blob/latest/lib/utils/cmd-list.js
+
+import abbrev from "abbrev";
+
+const commands = [
+  "access",
+  "adduser",
+  "audit",
+  "bugs",
+  "cache",
+  "ci",
+  "completion",
+  "config",
+  "dedupe",
+  "deprecate",
+  "diff",
+  "dist-tag",
+  "docs",
+  "doctor",
+  "edit",
+  "exec",
+  "explain",
+  "explore",
+  "find-dupes",
+  "fund",
+  "get",
+  "help",
+  "help-search",
+  "init",
+  "install",
+  "install-ci-test",
+  "install-test",
+  "link",
+  "ll",
+  "login",
+  "logout",
+  "ls",
+  "org",
+  "outdated",
+  "owner",
+  "pack",
+  "ping",
+  "pkg",
+  "prefix",
+  "profile",
+  "prune",
+  "publish",
+  "query",
+  "rebuild",
+  "repo",
+  "restart",
+  "root",
+  "run",
+  "sbom",
+  "search",
+  "set",
+  "shrinkwrap",
+  "star",
+  "stars",
+  "start",
+  "stop",
+  "team",
+  "test",
+  "token",
+  "undeprecate",
+  "uninstall",
+  "unpublish",
+  "unstar",
+  "update",
+  "version",
+  "view",
+  "whoami",
+];
+
+// These must resolve to an entry in commands
+const aliases = {
+  // aliases
+  author: "owner",
+  home: "docs",
+  issues: "bugs",
+  info: "view",
+  show: "view",
+  find: "search",
+  add: "install",
+  unlink: "uninstall",
+  remove: "uninstall",
+  rm: "uninstall",
+  r: "uninstall",
+
+  // short names for common things
+  un: "uninstall",
+  rb: "rebuild",
+  list: "ls",
+  ln: "link",
+  create: "init",
+  i: "install",
+  it: "install-test",
+  cit: "install-ci-test",
+  up: "update",
+  c: "config",
+  s: "search",
+  se: "search",
+  tst: "test",
+  t: "test",
+  ddp: "dedupe",
+  v: "view",
+  "run-script": "run",
+  "clean-install": "ci",
+  "clean-install-test": "install-ci-test",
+  x: "exec",
+  why: "explain",
+  la: "ll",
+  verison: "version",
+  ic: "ci",
+
+  // typos
+  innit: "init",
+  // manually abbrev so that install-test doesn't make insta stop working
+  in: "install",
+  ins: "install",
+  inst: "install",
+  insta: "install",
+  instal: "install",
+  isnt: "install",
+  isnta: "install",
+  isntal: "install",
+  isntall: "install",
+  "install-clean": "ci",
+  "isntall-clean": "ci",
+  hlep: "help",
+  "dist-tags": "dist-tag",
+  upgrade: "update",
+  udpate: "update",
+  rum: "run",
+  sit: "install-ci-test",
+  urn: "run",
+  ogr: "org",
+  "add-user": "adduser",
+};
+
+export function deref(c) {
+  if (!c) {
+    return;
+  }
+
+  // Translate camelCase to snake-case (i.e. installTest to install-test)
+  if (c.match(/[A-Z]/)) {
+    c = c.replace(/([A-Z])/g, (m) => "-" + m.toLowerCase());
+  }
+
+  // if they asked for something exactly we are done
+  if (commands.includes(c)) {
+    return c;
+  }
+
+  // if they asked for a direct alias
+  if (aliases[c]) {
+    return aliases[c];
+  }
+
+  const abbrevs = abbrev(commands.concat(Object.keys(aliases)));
+
+  // first deref the abbrev, if there is one
+  // then resolve any aliases
+  // so `npm install-cl` will resolve to `install-clean` then to `ci`
+  let a = abbrevs[c];
+  while (aliases[a]) {
+    a = aliases[a];
+  }
+  return a;
+}

src/packagemanager/npm/utils/npmCommands.js

@@ -0,0 +1,26 @@
+import { deref } from "./cmd-list.js";
+
+export function getNpmCommandForArgs(args) {
+  if (args.length === 0) {
+    return null;
+  }
+
+  const argCommand = deref(args[0]);
+  if (!argCommand) {
+    return null;
+  }
+
+  return argCommand;
+}
+
+export function hasDryRunArg(args) {
+  return args.some((arg) => arg === "--dry-run");
+}
+
+export const npmInstallCommand = "install";
+export const npmCiCommand = "ci";
+export const npmInstallTestCommand = "install-test";
+export const npmInstallCiTestCommand = "install-ci-test";
+export const npmUpdateCommand = "update";
+export const npmAuditCommand = "audit";
+export const npmExecCommand = "exec";

src/packagemanager/npx/createPackageManager.js

@@ -0,0 +1,13 @@
+import { commandArgumentScanner } from "./dependencyScanner/commandArgumentScanner.js";
+import { runNpx } from "./runNpxCommand.js";
+
+export function createNpxPackageManager() {
+  const scanner = commandArgumentScanner();
+
+  return {
+    getWarningMessage: () => null,
+    runCommand: runNpx,
+    isSupportedCommand: (args) => scanner.shouldScan(args),
+    getDependencyUpdatesForCommand: (args) => scanner.scan(args),
+  };
+}

src/packagemanager/npx/dependencyScanner/commandArgumentScanner.js

@@ -0,0 +1,31 @@
+import { resolvePackageVersion } from "../../../api/npmApi.js";
+import { parsePackagesFromArguments } from "../parsing/parsePackagesFromArguments.js";
+
+export function commandArgumentScanner() {
+  return {
+    scan: (args) => scanDependencies(args),
+    shouldScan: () => true, // all npx commands need to be scanned, npx doesn't have dry-run
+  };
+}
+function scanDependencies(args) {
+  return checkChangesFromArgs(args);
+}
+
+export async function checkChangesFromArgs(args) {
+  const changes = [];
+  const packageUpdates = parsePackagesFromArguments(args);
+
+  for (const packageUpdate of packageUpdates) {
+    var exactVersion = await resolvePackageVersion(
+      packageUpdate.name,
+      packageUpdate.version
+    );
+    if (exactVersion) {
+      packageUpdate.version = exactVersion;
+    }
+
+    changes.push({ ...packageUpdate, type: "add" });
+  }
+
+  return changes;
+}

src/packagemanager/npx/parsing/parsePackagesFromArguments.js

@@ -0,0 +1,106 @@
+export function parsePackagesFromArguments(args) {
+  let defaultTag = "latest";
+
+  for (let i = 0; i < args.length; i++) {
+    const arg = args[i];
+    const option = getOption(arg);
+
+    if (option) {
+      // If the option has a parameter, skip the next argument as well
+      i += option.numberOfParameters;
+
+      continue;
+    }
+
+    const packageDetails = parsePackagename(arg, defaultTag);
+    if (packageDetails) {
+      return [packageDetails];
+    }
+  }
+
+  return [];
+}
+
+function getOption(arg) {
+  if (isOptionWithParameter(arg)) {
+    return {
+      name: arg,
+      numberOfParameters: 1,
+    };
+  }
+
+  // Arguments starting with "-" or "--" are considered options
+  // except for "--package=" which contains the package name
+  if (arg.startsWith("-") && !arg.startsWith("--package=")) {
+    return {
+      name: arg,
+      numberOfParameters: 0,
+    };
+  }
+
+  return undefined;
+}
+
+function isOptionWithParameter(arg) {
+  const optionsWithParameters = [
+    "--access",
+    "--auth-type",
+    "--cache",
+    "--fetch-retries",
+    "--fetch-retry-mintimeout",
+    "--fetch-retry-maxtimeout",
+    "--fetch-retry-factor",
+    "--fetch-timeout",
+    "--https-proxy",
+    "--include",
+    "--location",
+    "--lockfile-version",
+    "--loglevel",
+    "--omit",
+    "--proxy",
+    "--registry",
+    "--replace-registry-host",
+    "--tag",
+    "--user-config",
+    "--workspace",
+  ];
+
+  return optionsWithParameters.includes(arg);
+}
+
+function parsePackagename(arg, defaultTag) {
+  // format can be --package=name@version
+  // in that case, we need to remove the --package= part
+  if (arg.startsWith("--package=")) {
+    arg = arg.slice(10);
+  }
+
+  arg = removeAlias(arg);
+
+  // Split at the last "@" to separate the package name and version
+  const lastAtIndex = arg.lastIndexOf("@");
+
+  let name, version;
+  if (lastAtIndex !== -1) {
+    name = arg.slice(0, lastAtIndex);
+    version = arg.slice(lastAtIndex + 1);
+  } else {
+    name = arg;
+    version = defaultTag; // No tag specified (eg: "http-server"), use the default tag
+  }
+
+  return {
+    name,
+    version,
+  };
+}
+
+function removeAlias(arg) {
+  // removes the alias.
+  // Eg.: server@npm:http-server@latest becomes http-server@latest
+  const aliasIndex = arg.indexOf("@npm:");
+  if (aliasIndex !== -1) {
+    return arg.slice(aliasIndex + 5);
+  }
+  return arg;
+}

src/packagemanager/npx/parsing/parsePackagesFromArguments.spec.js

@@ -0,0 +1,147 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { parsePackagesFromArguments } from "./parsePackagesFromArguments.js";
+
+describe("parsePackagesFromArguments", () => {
+  it("should return an empty array for no changes", () => {
+    const args = [];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, []);
+  });
+
+  it("should return an array of changes for one package", () => {
+    const args = ["http-server@14.1.1"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "14.1.1" }]);
+  });
+
+  it("should return the package with latest tag if absent", () => {
+    const args = ["http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should ignore double --", () => {
+    const args = ["--", "http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should only return the first package", () => {
+    const args = ["http-server", "jest"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should return package with -p option", () => {
+    const args = ["-p", "http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should return package with --package option", () => {
+    const args = ["--package", "http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should return package with --package=x option", () => {
+    const args = ["--package=http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "latest" }]);
+  });
+
+  it("should return package with --package=x@version option", () => {
+    const args = ["--package=http-server@1.0.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "1.0.0" }]);
+  });
+
+  it("should ignore options with parameters and return an array of changes", () => {
+    const args = ["--loglevel", "error", "http-server@14.1.1"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "14.1.1" }]);
+  });
+
+  it("should parse version even for aliased packages", () => {
+    const args = ["server@npm:http-server@14.1.1"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "14.1.1" }]);
+  });
+
+  it("should parse scoped packages", () => {
+    const args = ["@scope/package@1.0.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "@scope/package", version: "1.0.0" }]);
+  });
+
+  it("should parse packages with version ranges", () => {
+    const args = ["http-server@^14.1.1"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "http-server", version: "^14.1.1" }]);
+  });
+
+  it("should parse package folders", () => {
+    const args = ["./local-package"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "./local-package", version: "latest" }]);
+  });
+
+  it("should parse tarballs", () => {
+    const args = ["file:./local-package.tgz"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "file:./local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse tarball URLs", () => {
+    const args = ["https://example.com/local-package.tgz"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "https://example.com/local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse git URLs", () => {
+    const args = ["git://github.com/http-party/http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "git://github.com/http-party/http-server", version: "latest" },
+    ]);
+  });
+});

src/packagemanager/npx/runNpxCommand.js

@@ -0,0 +1,17 @@
+import { execSync } from "child_process";
+import { ui } from "../../environment/userInteraction.js";
+
+export function runNpx(args) {
+  try {
+    const npxCommand = `npx ${args.join(" ")}`;
+    execSync(npxCommand, { stdio: "inherit" });
+  } catch (error) {
+    if (error.status) {
+      return { status: error.status };
+    } else {
+      ui.writeError("Error executing command:", error.message);
+      return { status: 1 };
+    }
+  }
+  return { status: 0 };
+}

src/packagemanager/yarn/createPackageManager.js

@@ -0,0 +1,34 @@
+import { commandArgumentScanner } from "./dependencyScanner/commandArgumentScanner.js";
+import { runYarnCommand } from "./runYarnCommand.js";
+
+const scanner = commandArgumentScanner();
+
+export function createYarnPackageManager() {
+  return {
+    getWarningMessage: () => null,
+    runCommand: runYarnCommand,
+    isSupportedCommand: (args) =>
+      matchesCommand(args, "add") ||
+      matchesCommand(args, "global", "add") ||
+      matchesCommand(args, "install") ||
+      matchesCommand(args, "up") ||
+      matchesCommand(args, "upgrade") ||
+      matchesCommand(args, "global", "upgrade") ||
+      matchesCommand(args, "dlx"),
+    getDependencyUpdatesForCommand: (args) => scanner.scan(args),
+  };
+}
+
+function matchesCommand(args, ...commandArgs) {
+  if (args.length < commandArgs.length) {
+    return false;
+  }
+
+  for (var i = 0; i < commandArgs.length; i++) {
+    if (args[i].toLowerCase() !== commandArgs[i].toLowerCase()) {
+      return false;
+    }
+  }
+
+  return true;
+}

src/packagemanager/yarn/dependencyScanner/commandArgumentScanner.js

@@ -0,0 +1,28 @@
+import { resolvePackageVersion } from "../../../api/npmApi.js";
+import { parsePackagesFromArguments } from "../parsing/parsePackagesFromArguments.js";
+
+export function commandArgumentScanner() {
+  return {
+    scan: (args) => scanDependencies(args),
+    shouldScan: () => true, // There's no dry run for yarn, so we always scan
+  };
+}
+
+async function scanDependencies(args) {
+  const changes = [];
+  const packageUpdates = parsePackagesFromArguments(args);
+
+  for (const packageUpdate of packageUpdates) {
+    var exactVersion = await resolvePackageVersion(
+      packageUpdate.name,
+      packageUpdate.version
+    );
+    if (exactVersion) {
+      packageUpdate.version = exactVersion;
+    }
+
+    changes.push({ ...packageUpdate, type: "add" });
+  }
+
+  return changes;
+}

src/packagemanager/yarn/parsing/parsePackagesFromArguments.js

@@ -0,0 +1,102 @@
+export function parsePackagesFromArguments(args) {
+  const changes = [];
+  let defaultTag = "latest";
+
+  for (let i = 1; i < args.length; i++) {
+    const arg = args[i];
+    const option = getOption(arg);
+
+    if (option) {
+      // If the option has a parameter, skip the next argument as well
+      i += option.numberOfParameters;
+
+      continue;
+    }
+
+    const packageDetails = parsePackagename(arg, defaultTag);
+    if (packageDetails) {
+      changes.push(packageDetails);
+    }
+  }
+
+  return changes;
+}
+
+function getOption(arg) {
+  if (isOptionWithParameter(arg)) {
+    return {
+      name: arg,
+      numberOfParameters: 1,
+    };
+  }
+
+  // Arguments starting with "-" or "--" are considered options
+  // except for "--package=" which contains the package name
+  if (arg.startsWith("-")) {
+    return {
+      name: arg,
+      numberOfParameters: 0,
+    };
+  }
+
+  return undefined;
+}
+
+function isOptionWithParameter(arg) {
+  const optionsWithParameters = [
+    "--use-yarnrc",
+    "--link-folder",
+    "--global-folder",
+    "--modules-folder",
+    "--preferred-cache-folder",
+    "--cache-folder",
+    "--mutex",
+    "--cwd",
+    "--proxy",
+    "--https-proxy",
+    "--registry",
+    "--network-concurrency",
+    "--network-timeout",
+    "--scripts-prepend-node-path",
+    "--otp",
+  ];
+
+  return optionsWithParameters.includes(arg);
+}
+
+function parsePackagename(arg, defaultTag) {
+  // format can be --package=name@version
+  // in that case, we need to remove the --package= part
+  if (arg.startsWith("--package=")) {
+    arg = arg.slice(10);
+  }
+
+  arg = removeAlias(arg);
+
+  // Split at the last "@" to separate the package name and version
+  const lastAtIndex = arg.lastIndexOf("@");
+
+  let name, version;
+  if (lastAtIndex !== -1) {
+    name = arg.slice(0, lastAtIndex);
+    version = arg.slice(lastAtIndex + 1);
+  } else {
+    name = arg;
+    version = defaultTag; // No tag specified (eg: "http-server"), use the default tag
+  }
+
+  return {
+    name,
+    version,
+  };
+}
+
+function removeAlias(arg) {
+  // removes the alias.
+  // Eg.: server@npm:http-server@latest becomes http-server@latest
+  const aliasIndex = arg.indexOf("@npm:");
+  if (aliasIndex !== -1) {
+    return arg.slice(aliasIndex + 5);
+  }
+  return arg;
+}

src/packagemanager/yarn/parsing/parsePackagesFromArguments.spec.js

@@ -0,0 +1,126 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { parsePackagesFromArguments } from "./parsePackagesFromArguments.js";
+
+describe("standardYarnArgumentParser", () => {
+  it("should return an empty array for no changes", () => {
+    const args = ["add"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, []);
+  });
+
+  it("should return an array of changes for one package", () => {
+    const args = ["add", "axios@1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "1.9.0" }]);
+  });
+
+  it("should return the package with latest tag if absent", () => {
+    const args = ["add", "axios"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "latest" }]);
+  });
+
+  it("should only return all packages", () => {
+    const args = ["add", "axios", "jest"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "axios", version: "latest" },
+      { name: "jest", version: "latest" },
+    ]);
+  });
+
+  it("should ignore options with parameters and return an array of changes", () => {
+    const args = ["add", "--proxy", "http://localhost", "axios@1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "1.9.0" }]);
+  });
+
+  it("should parse version even for aliased packages", () => {
+    const args = ["add", "server@npm:axios@1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "1.9.0" }]);
+  });
+
+  it("should parse scoped packages", () => {
+    const args = ["add", "@scope/package@1.0.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "@scope/package", version: "1.0.0" }]);
+  });
+
+  it("should parse packages with version ranges", () => {
+    const args = ["add", "axios@^1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "^1.9.0" }]);
+  });
+
+  it("should parse package folders", () => {
+    const args = ["add", "./local-package"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "./local-package", version: "latest" }]);
+  });
+
+  it("should parse tarballs", () => {
+    const args = ["add", "file:./local-package.tgz"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "file:./local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse tarball URLs", () => {
+    const args = ["add", "https://example.com/local-package.tgz"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "https://example.com/local-package.tgz", version: "latest" },
+    ]);
+  });
+
+  it("should parse git URLs", () => {
+    const args = ["add", "git://github.com/http-party/http-server"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [
+      { name: "git://github.com/http-party/http-server", version: "latest" },
+    ]);
+  });
+
+  it("should parse packages with -p {packageName}", () => {
+    const args = ["dlx", "-p", "axios@1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "1.9.0" }]);
+  });
+
+  it("should parse packages with --package {packageName}", () => {
+    const args = ["dlx", "--package", "axios@1.9.0"];
+
+    const result = parsePackagesFromArguments(args);
+
+    assert.deepEqual(result, [{ name: "axios", version: "1.9.0" }]);
+  });
+});

src/packagemanager/yarn/runYarnCommand.js

@@ -0,0 +1,17 @@
+import { execSync } from "child_process";
+import { ui } from "../../environment/userInteraction.js";
+
+export function runYarnCommand(args) {
+  try {
+    const npxCommand = `yarn ${args.join(" ")}`;
+    execSync(npxCommand, { stdio: "inherit" });
+  } catch (error) {
+    if (error.status) {
+      return { status: error.status };
+    } else {
+      ui.writeError("Error executing command:", error.message);
+      return { status: 1 };
+    }
+  }
+  return { status: 0 };
+}

src/scanning/audit/index.js

@@ -0,0 +1,56 @@
+import {
+  MALWARE_STATUS_MALWARE,
+  openMalwareDatabase,
+} from "../malwareDatabase.js";
+
+export async function auditChanges(changes) {
+  const allowedChanges = [];
+  const disallowedChanges = [];
+
+  var malwarePackages = await getPackagesWithMalware(
+    changes.filter(
+      (change) => change.type === "add" || change.type === "change"
+    )
+  );
+
+  for (const change of changes) {
+    const malwarePackage = malwarePackages.find(
+      (pkg) => pkg.name === change.name && pkg.version === change.version
+    );
+
+    if (malwarePackage) {
+      disallowedChanges.push({ ...change, reason: malwarePackage.status });
+    } else {
+      allowedChanges.push(change);
+    }
+  }
+
+  const auditResults = {
+    allowedChanges,
+    disallowedChanges,
+    isAllowed: disallowedChanges.length === 0,
+  };
+
+  return auditResults;
+}
+
+async function getPackagesWithMalware(changes) {
+  if (changes.length === 0) {
+    return [];
+  }
+
+  const malwareDb = await openMalwareDatabase();
+  let allVulnerablePackages = [];
+
+  for (const change of changes) {
+    if (malwareDb.isMalware(change.name, change.version)) {
+      allVulnerablePackages.push({
+        name: change.name,
+        version: change.version,
+        status: MALWARE_STATUS_MALWARE,
+      });
+    }
+  }
+
+  return allVulnerablePackages;
+}

src/scanning/index.js

@@ -0,0 +1,92 @@
+import { auditChanges } from "./audit/index.js";
+import { getScanTimeout } from "../config/configFile.js";
+import { setTimeout } from "timers/promises";
+import chalk from "chalk";
+import { getPackageManager } from "../packagemanager/currentPackageManager.js";
+import { ui } from "../environment/userInteraction.js";
+
+export function shouldScanCommand(args) {
+  if (!args || args.length === 0) {
+    return false;
+  }
+
+  return getPackageManager().isSupportedCommand(args);
+}
+
+export async function scanCommand(args) {
+  if (!shouldScanCommand(args)) {
+    return [];
+  }
+
+  let timedOut = false;
+
+  const spinner = ui.startProcess("Scanning for malicious packages...");
+  let audit;
+
+  await Promise.race([
+    (async () => {
+      try {
+        const packageManager = getPackageManager();
+        const changes = await packageManager.getDependencyUpdatesForCommand(
+          args
+        );
+
+        if (timedOut) {
+          return;
+        }
+
+        if (changes.length > 0) {
+          spinner.setText(`Scanning ${changes.length} package(s)...`);
+        }
+
+        audit = await auditChanges(changes);
+      } catch (error) {
+        spinner.fail(`Error while scanning: ${error.message}`);
+        throw error;
+      }
+    })(),
+    setTimeout(getScanTimeout()).then(() => {
+      timedOut = true;
+    }),
+  ]);
+
+  if (timedOut) {
+    spinner.fail("Timeout exceeded while scanning.");
+    throw new Error("Timeout exceeded while scanning npm install command.");
+  }
+
+  if (!audit || audit.isAllowed) {
+    spinner.succeed("No malicious packages detected.");
+  } else {
+    printMaliciousChanges(audit.disallowedChanges, spinner);
+    await acceptRiskOrExit(
+      "Do you want to continue with the installation despite the risks?",
+      false
+    );
+  }
+}
+
+function printMaliciousChanges(changes, spinner) {
+  spinner.fail(chalk.bold("Malicious changes detected:"));
+
+  for (const change of changes) {
+    ui.writeInformation(` - ${change.name}@${change.version}`);
+  }
+}
+
+async function acceptRiskOrExit(message, defaultValue) {
+  ui.emptyLine();
+  const continueInstall = await ui.confirm({
+    message: message,
+    default: defaultValue,
+  });
+
+  if (continueInstall) {
+    ui.writeInformation("Continuing with the installation...");
+    return;
+  }
+
+  ui.writeInformation("Exiting without installing packages.");
+  ui.emptyLine();
+  process.exit(1);
+}

src/scanning/index.scanCommand.spec.js

@@ -0,0 +1,180 @@
+import assert from "node:assert/strict";
+import { describe, it, mock } from "node:test";
+import { setTimeout } from "node:timers/promises";
+
+describe("scanCommand", async () => {
+  const getScanTimeoutMock = mock.fn(() => 1000);
+  const mockGetDependencyUpdatesForCommand = mock.fn();
+  const mockStartProcess = mock.fn(() => ({
+    setText: () => {},
+    succeed: () => {},
+    fail: () => {},
+  }));
+  const mockConfirm = mock.fn(() => true);
+
+  // import { getPackageManager } from "../packagemanager/currentPackageManager.js";
+  mock.module("../packagemanager/currentPackageManager.js", {
+    namedExports: {
+      getPackageManager: () => {
+        return {
+          isSupportedCommand: () => true,
+          getDependencyUpdatesForCommand: mockGetDependencyUpdatesForCommand,
+        };
+      },
+    },
+  });
+
+  // import { getScanTimeout } from "../config/configFile.js";
+  mock.module("../config/configFile.js", {
+    namedExports: {
+      getScanTimeout: getScanTimeoutMock,
+      getBaseUrl: () => undefined,
+    },
+  });
+
+  // import { ui } from "../environment/userInteraction.js";
+  mock.module("../environment/userInteraction.js", {
+    namedExports: {
+      ui: {
+        startProcess: mockStartProcess,
+        writeError: () => {},
+        writeInformation: () => {},
+        writeWarning: () => {},
+        emptyLine: () => {},
+        confirm: mockConfirm,
+      },
+    },
+  });
+
+  // import { auditChanges, MAX_LENGTH_EXCEEDED } from "./audit/index.js";
+  mock.module("./audit/index.js", {
+    namedExports: {
+      auditChanges: (changes) => {
+        const malisciousChangeName = "malicious";
+        const allowedChanges = changes.filter(
+          (change) => change.name !== malisciousChangeName
+        );
+        const disallowedChanges = changes
+          .filter((change) => change.name === malisciousChangeName)
+          .map((change) => ({
+            ...change,
+            reason: "malicious",
+          }));
+        const auditResults = {
+          allowedChanges,
+          disallowedChanges,
+          isAllowed: disallowedChanges.length === 0,
+        };
+
+        return auditResults;
+      },
+      MAX_LENGTH_EXCEEDED: "MAX_LENGTH_EXCEEDED",
+    },
+  });
+
+  const { scanCommand } = await import("./index.js");
+
+  it("should succeed when there are no changes", async () => {
+    let successMessageWasSet = false;
+    mockStartProcess.mock.mockImplementationOnce(() => ({
+      setText: () => {},
+      succeed: () => {
+        successMessageWasSet = true;
+      },
+      fail: () => {},
+    }));
+    mockGetDependencyUpdatesForCommand.mock.mockImplementation(() => []);
+
+    await scanCommand(["install", "lodash"]);
+
+    assert.equal(successMessageWasSet, true);
+  });
+
+  it("should succeed when changes are not malicious", async () => {
+    let successMessageWasSet = false;
+    mockStartProcess.mock.mockImplementationOnce(() => ({
+      setText: () => {},
+      succeed: () => {
+        successMessageWasSet = true;
+      },
+      fail: () => {},
+    }));
+    mockGetDependencyUpdatesForCommand.mock.mockImplementation(() => [
+      { name: "lodash", version: "4.17.21" },
+    ]);
+
+    await scanCommand(["install", "lodash"]);
+
+    assert.equal(successMessageWasSet, true);
+  });
+
+  it("should throw an error when timing out", async () => {
+    let failureMessageWasSet = false;
+    mockStartProcess.mock.mockImplementationOnce(() => ({
+      setText: () => {},
+      succeed: () => {},
+      fail: () => {
+        failureMessageWasSet = true;
+      },
+    }));
+    getScanTimeoutMock.mock.mockImplementationOnce(() => 100);
+    mockGetDependencyUpdatesForCommand.mock.mockImplementation(async () => {
+      await setTimeout(150);
+      return [{ name: "lodash", version: "4.17.21" }];
+    });
+
+    await assert.rejects(scanCommand(["install", "lodash"]));
+
+    assert.equal(failureMessageWasSet, true);
+  });
+
+  it("should fail and prompt the user when malicious changes are detected", async () => {
+    let failureMessageWasSet = false;
+    mockStartProcess.mock.mockImplementationOnce(() => ({
+      setText: () => {},
+      succeed: () => {},
+      fail: () => {
+        failureMessageWasSet = true;
+      },
+    }));
+    mockGetDependencyUpdatesForCommand.mock.mockImplementation(() => [
+      { name: "malicious", version: "1.0.0" },
+    ]);
+    let userWasPrompted = false;
+    mockConfirm.mock.mockImplementationOnce(() => {
+      userWasPrompted = true;
+      return true; // Simulate user accepting the risk, otherwise the process would exit
+    });
+
+    await scanCommand(["install", "malicious"]);
+
+    assert.equal(failureMessageWasSet, true);
+    assert.equal(userWasPrompted, true);
+  });
+
+  it("should not report a timeout when the user takes a long time to respond (it should not affect the timeout)", async () => {
+    let failureMessages = [];
+    mockStartProcess.mock.mockImplementationOnce(() => ({
+      setText: () => {},
+      succeed: () => {},
+      fail: (message) => {
+        failureMessages.push(message);
+      },
+    }));
+    getScanTimeoutMock.mock.mockImplementationOnce(() => 100);
+    mockGetDependencyUpdatesForCommand.mock.mockImplementation(async () => {
+      return [{ name: "malicious", version: "4.17.21" }];
+    });
+    mockConfirm.mock.mockImplementationOnce(async () => {
+      await setTimeout(200);
+      return true; // Simulate user accepting the risk, otherwise the process would exit
+    });
+
+    await scanCommand(["install", "malicious"]);
+
+    assert.equal(failureMessages.length, 1);
+    const failureMessage = failureMessages[0];
+    assert.equal(failureMessage.toLowerCase().includes("timeout"), false);
+    assert.equal(failureMessage.toLowerCase().includes("malicious"), true);
+  });
+});

src/scanning/index.shouldScanCommand.spec.js

@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import { describe, it, mock } from "node:test";
+
+describe("shouldScanCommand", async () => {
+  const isSupportedCommandMock = mock.fn(() => undefined);
+
+  mock.module("../packagemanager/currentPackageManager.js", {
+    namedExports: {
+      getPackageManager: () => {
+        return {
+          isSupportedCommand: isSupportedCommandMock,
+          getDependencyUpdatesForCommand: () => [],
+        };
+      },
+    },
+  });
+
+  const { shouldScanCommand } = await import("./index.js");
+
+  it("should return false if the argument is an empty array", () => {
+    const result = shouldScanCommand([]);
+
+    assert.strictEqual(result, false);
+  });
+
+  it("should return false if the argument is undefined", () => {
+    const result = shouldScanCommand(undefined);
+
+    assert.strictEqual(result, false);
+  });
+
+  it("should return true if the package manager supports the command", () => {
+    isSupportedCommandMock.mock.mockImplementation(() => true);
+
+    const result = shouldScanCommand(["install", "lodash"]);
+
+    assert.strictEqual(result, true);
+  });
+
+  it("should return false if the package manager does not support the command", () => {
+    isSupportedCommandMock.mock.mockImplementation(() => false);
+
+    const result = shouldScanCommand(["unknown", "command"]);
+
+    assert.strictEqual(result, false);
+  });
+});

src/scanning/malwareDatabase.js

@@ -0,0 +1,72 @@
+import {
+  fetchMalwareDatabase,
+  fetchMalwareDatabaseVersion,
+} from "../api/aikido.js";
+import {
+  readDatabaseFromLocalCache,
+  writeDatabaseToLocalCache,
+} from "../config/configFile.js";
+import { ui } from "../environment/userInteraction.js";
+
+export async function openMalwareDatabase() {
+  const malwareDatabase = await getMalwareDatabase();
+
+  function getPackageStatus(name, version) {
+    const packageData = malwareDatabase.find(
+      (pkg) =>
+        pkg.package_name === name &&
+        (pkg.version === version || pkg.version === "*")
+    );
+
+    if (!packageData) {
+      return MALWARE_STATUS_OK;
+    }
+
+    return packageData.reason;
+  }
+
+  return {
+    getPackageStatus,
+    isMalware: (name, version) => {
+      const status = getPackageStatus(name, version);
+      return isMalwareStatus(status);
+    },
+  };
+}
+
+async function getMalwareDatabase() {
+  const { malwareDatabase: cachedDatabase, version: cachedVersion } =
+    readDatabaseFromLocalCache();
+
+  try {
+    if (cachedDatabase) {
+      const currentVersion = await fetchMalwareDatabaseVersion();
+      if (cachedVersion === currentVersion) {
+        return cachedDatabase;
+      }
+    }
+
+    const { malwareDatabase, version } = await fetchMalwareDatabase();
+    writeDatabaseToLocalCache(malwareDatabase, version);
+
+    return malwareDatabase;
+  } catch (error) {
+    if (cachedDatabase) {
+      ui.writeWarning(
+        "Failed to fetch the latest malware database. Using cached version."
+      );
+      return cachedDatabase;
+    }
+    throw error;
+  }
+}
+
+function isMalwareStatus(status) {
+  let malwareStatus = status.toUpperCase();
+  return malwareStatus === MALWARE_STATUS_MALWARE;
+}
+
+export const MALWARE_STATUS_OK = "OK";
+export const MALWARE_STATUS_MALWARE = "MALWARE";
+export const MALWARE_STATUS_TELEMETRY = "TELEMETRY";
+export const MALWARE_STATUS_PROTESTWARE = "PROTESTWARE";

src/shell-integration/helpers.js

@@ -0,0 +1,44 @@
+const knownAikidoTools = [
+  { tool: "npm", aikidoCommand: "aikido-npm" },
+  { tool: "npx", aikidoCommand: "aikido-npx" },
+  { tool: "yarn", aikidoCommand: "aikido-yarn" },
+  // When adding a new tool here, also update the expected alias in the tests (shellIntegration.spec.js)
+  // and add the documentation for the new tool in the README.md
+];
+
+export function getAliases(fileName) {
+  const fileExtension = fileName.split(".").pop().toLowerCase();
+
+  let createAlias = pickCreateAliasFunction(fileExtension);
+
+  const aliases = knownAikidoTools.map(({ tool, aikidoCommand }) =>
+    createAlias(tool, aikidoCommand)
+  );
+
+  return aliases;
+}
+
+function pickCreateAliasFunction(fileExtension) {
+  let createAlias;
+  switch (fileExtension) {
+    case "ps1":
+      createAlias = createGeneralPowershellAlias;
+      break;
+    case "fish":
+      createAlias = createGeneralFishAlias;
+      break;
+    default:
+      createAlias = createGeneralPosixAlias;
+  }
+  return createAlias;
+}
+
+function createGeneralPosixAlias(tool, aikidoCommand) {
+  return `alias ${tool}='${aikidoCommand}'`;
+}
+function createGeneralPowershellAlias(tool, aikidoCommand) {
+  return `Set-Alias ${tool} ${aikidoCommand}`;
+}
+function createGeneralFishAlias(tool, aikidoCommand) {
+  return `alias ${tool} "${aikidoCommand}"`;
+}

src/shell-integration/setup.js

@@ -0,0 +1,151 @@
+import chalk from "chalk";
+import { ui } from "../environment/userInteraction.js";
+import { detectShells } from "./shellDetection.js";
+import { getAliases } from "./helpers.js";
+import fs from "fs";
+import { EOL } from "os";
+
+export async function setup() {
+  ui.writeInformation(
+    chalk.bold("Setting up shell aliases.") +
+      " This will wrap safe-chain around npm, npx, and yarn commands."
+  );
+  ui.emptyLine();
+
+  try {
+    const shells = detectShells();
+    if (shells.length === 0) {
+      ui.writeError("No supported shells detected. Cannot set up aliases.");
+      return;
+    }
+
+    ui.writeInformation(
+      `Detected ${shells.length} supported shell(s): ${shells
+        .map((shell) => chalk.bold(shell.name))
+        .join(", ")}.`
+    );
+
+    let updatedCount = 0;
+    for (const shell of shells) {
+      if (setupAliasesForShell(shell)) {
+        updatedCount++;
+      }
+    }
+
+    if (updatedCount > 0) {
+      ui.emptyLine();
+      ui.writeInformation(`Please restart your terminal to apply the changes.`);
+    }
+  } catch (error) {
+    ui.writeError(
+      `Failed to set up shell aliases: ${error.message}. Please check your shell configuration.`
+    );
+    return;
+  }
+}
+
+/**
+ * This function sets up aliases for the given shell.
+ * It reads the shell's startup file (eg ~/.bashrc, ~/.zshrc, etc.),
+ * and then appends the aliases for npm, npx, and yarn commands.
+ * If the aliases already exist, it will not add them again.
+ * If the startup file does not exist, it will create it.
+ *
+ * The shell startup script is loaded by the respective shell when it starts.
+ * This means that the aliases will be available in the shell after it is restarted.
+ */
+function setupAliasesForShell(shell) {
+  if (!shell.startupFile) {
+    ui.writeError(
+      `- ${chalk.bold(
+        shell.name
+      )}: no startup file found. Cannot set up aliases.`
+    );
+    return false;
+  }
+
+  const aliases = getAliases(shell.startupFile);
+
+  if (aliases.length === 0) {
+    ui.writeError(`- ${chalk.bold(shell.name)}: could not generate aliases.`);
+    return false;
+  }
+
+  const fileContent = readOrCreateStartupFile(shell.startupFile);
+  const { addedCount, existingCount, failedCount } = appendAliasesToFile(
+    aliases,
+    fileContent,
+    shell.startupFile
+  );
+
+  let summary = "- " + chalk.bold(shell.name) + ": ";
+
+  if (addedCount > 0) {
+    summary += chalk.green(`${addedCount} aliases were added`);
+  }
+  if (existingCount > 0) {
+    if (addedCount > 0) {
+      summary += ", ";
+    }
+    summary += chalk.yellow(`${existingCount} aliases were already present`);
+  }
+  if (failedCount > 0) {
+    if (addedCount > 0 || existingCount > 0) {
+      summary += ", ";
+    }
+    summary += chalk.red(`${failedCount} aliases failed to add`);
+  }
+
+  // write summary in a single line
+  ui.writeInformation(summary);
+
+  return true;
+}
+
+/**
+ * This reads the content of the startup file.
+ * If the file does not exist, it creates an empty file and returns an empty string.
+ * The startup file is the shell's startup script (eg: ~/.bashrc, ~/.zshrc, etc.).
+ * It is used to set up the shell environment when it starts.
+ * Some shells may not have a startup file, in which case this function will create one.
+ */
+export function readOrCreateStartupFile(filePath) {
+  if (!fs.existsSync(filePath)) {
+    fs.writeFileSync(filePath, "", "utf-8");
+    ui.writeInformation(`File ${filePath} created.`);
+  }
+  return fs.readFileSync(filePath, "utf-8");
+}
+
+/**
+ * This function appends the aliases to the startup file.
+ *  eg: for bash it will append 'alias npm="aikido-npm"' for npm to ~/.bashrc
+ * @returns an object with the counts of added, existing, and failed aliases.
+ */
+export function appendAliasesToFile(aliases, fileContent, startupFilePath) {
+  let addedCount = 0;
+  let existingCount = 0;
+  let failedCount = 0;
+
+  for (const alias of aliases) {
+    try {
+      if (fileContent.includes(alias)) {
+        existingCount++;
+        continue;
+      }
+
+      fs.appendFileSync(startupFilePath, `${EOL}${alias}`, "utf-8");
+
+      addedCount++;
+    } catch {
+      failedCount++;
+      continue;
+    }
+  }
+
+  return {
+    addedCount,
+    existingCount,
+    failedCount,
+  };
+}

src/shell-integration/setup.spec.js

@@ -0,0 +1,304 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { EOL, tmpdir } from "node:os";
+import fs from "node:fs";
+import { getAliases } from "./helpers.js";
+import { readOrCreateStartupFile, appendAliasesToFile } from "./setup.js";
+
+describe("setupShell", () => {
+  function runSetupTestsForEnvironment(shell, startupExtension, expectedAliases) {
+    describe(`${shell} shell setup`, () => {
+      it(`should add aliases to ${shell} file`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, "", "alias cls='clear'"];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = appendAliasesToFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.addedCount, 3, "Should add 3 aliases");
+        assert.strictEqual(result.existingCount, 0, "Should find no existing aliases");
+        assert.strictEqual(result.failedCount, 0, "Should have no failed aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.ok(updatedContent.includes(alias), `Alias "${alias}" should be added`);
+        }
+        assert.ok(updatedContent.includes("alias cls='clear'"), "Original aliases should remain");
+      });
+
+      it(`should not add aliases if they already exist in ${shell} file`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, "", ...expectedAliases];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = appendAliasesToFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.addedCount, 0, "Should add 0 aliases");
+        assert.strictEqual(result.existingCount, 3, "Should find 3 existing aliases");
+        assert.strictEqual(result.failedCount, 0, "Should have no failed aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        // Count occurrences to ensure no duplicates were added
+        for (const alias of expectedAliases) {
+          assert.strictEqual(countOccurrences(updatedContent, alias), 1, `Alias "${alias}" should appear exactly once`);
+        }
+      });
+
+      it(`should create file and add aliases if file does not exist for ${shell}`, () => {
+        const randomName = Math.random().toString(36).substring(2, 15);
+        const filePath = `${tmpdir()}/nonexistent-${randomName}${startupExtension}`;
+        if (fs.existsSync(filePath)) {
+          fs.rmSync(filePath, { force: true });
+        }
+        
+        // Test readOrCreateStartupFile function
+        const fileContent = readOrCreateStartupFile(filePath);
+        assert.strictEqual(fileContent, "", "Should return empty string for new file");
+        assert.ok(fs.existsSync(filePath), "File should be created");
+        
+        // Test adding aliases to the newly created file
+        const aliases = getAliases(filePath);
+        const result = appendAliasesToFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.addedCount, 3, "Should add 3 aliases");
+        assert.strictEqual(result.existingCount, 0, "Should find no existing aliases");
+        assert.strictEqual(result.failedCount, 0, "Should have no failed aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.ok(updatedContent.includes(alias), `Alias "${alias}" should be added`);
+        }
+      });
+
+      it(`should add aliases only once when called multiple times for ${shell}`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, ""];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        
+        // First call - should add aliases
+        let fileContent = fs.readFileSync(filePath, "utf-8");
+        const result1 = appendAliasesToFile(aliases, fileContent, filePath);
+        assert.strictEqual(result1.addedCount, 3, "First call should add 3 aliases");
+        
+        // Second call - should detect existing aliases
+        fileContent = fs.readFileSync(filePath, "utf-8");
+        const result2 = appendAliasesToFile(aliases, fileContent, filePath);
+        assert.strictEqual(result2.addedCount, 0, "Second call should add 0 aliases");
+        assert.strictEqual(result2.existingCount, 3, "Second call should find 3 existing aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.strictEqual(countOccurrences(updatedContent, alias), 1, `Alias "${alias}" should appear exactly once`);
+        }
+      });
+
+      it(`should use real getAliases() for ${shell} file`, () => {
+        const filePath = `${tmpdir()}/test${startupExtension}`;
+        const aliases = getAliases(filePath);
+        
+        // Verify we get the expected aliases for this shell type
+        assert.strictEqual(aliases.length, 3, "Should get 3 aliases (npm, npx, yarn)");
+        for (let i = 0; i < aliases.length; i++) {
+          assert.strictEqual(aliases[i], expectedAliases[i], `Alias ${i} should match expected format`);
+        }
+      });
+
+      it(`should handle mixed scenario - some existing, some new for ${shell}`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, "", expectedAliases[0], "alias other='command'"];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = appendAliasesToFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.addedCount, 2, "Should add 2 new aliases");
+        assert.strictEqual(result.existingCount, 1, "Should find 1 existing alias");
+        assert.strictEqual(result.failedCount, 0, "Should have no failed aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.ok(updatedContent.includes(alias), `Alias "${alias}" should be present`);
+        }
+        assert.ok(updatedContent.includes("alias other='command'"), "Other aliases should remain");
+      });
+    });
+  }
+
+  // Test for each shell type using real getAliases() output
+  runSetupTestsForEnvironment("bash", ".bashrc", [
+    "alias npm='aikido-npm'",
+    "alias npx='aikido-npx'",
+    "alias yarn='aikido-yarn'"
+  ]);
+
+  runSetupTestsForEnvironment("zsh", ".zshrc", [
+    "alias npm='aikido-npm'",
+    "alias npx='aikido-npx'",
+    "alias yarn='aikido-yarn'"
+  ]);
+
+  runSetupTestsForEnvironment("fish", ".fish", [
+    'alias npm "aikido-npm"',
+    'alias npx "aikido-npx"',
+    'alias yarn "aikido-yarn"'
+  ]);
+
+  runSetupTestsForEnvironment("pwsh", ".ps1", [
+    "Set-Alias npm aikido-npm",
+    "Set-Alias npx aikido-npx",
+    "Set-Alias yarn aikido-yarn"
+  ]);
+
+  describe("readOrCreateStartupFile", () => {
+    it("should read existing file content", () => {
+      const lines = ["#!/usr/bin/env bash", "", "alias test='echo test'"];
+      const filePath = createShellStartupScript(lines, ".bashrc");
+      
+      const content = readOrCreateStartupFile(filePath);
+      
+      assert.ok(content.includes("#!/usr/bin/env bash"), "Should contain shebang");
+      assert.ok(content.includes("alias test='echo test'"), "Should contain existing aliases");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+
+    it("should create file if it doesn't exist", () => {
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      if (fs.existsSync(filePath)) {
+        fs.rmSync(filePath, { force: true });
+      }
+      
+      const content = readOrCreateStartupFile(filePath);
+      
+      assert.strictEqual(content, "", "Should return empty string for new file");
+      assert.ok(fs.existsSync(filePath), "File should be created");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+
+    it("should handle empty existing file", () => {
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      fs.writeFileSync(filePath, "", "utf-8");
+      
+      const content = readOrCreateStartupFile(filePath);
+      
+      assert.strictEqual(content, "", "Should return empty string for empty file");
+      assert.ok(fs.existsSync(filePath), "File should still exist");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+  });
+
+  describe("appendAliasesToFile edge cases", () => {
+    it("should handle empty aliases array", () => {
+      const lines = ["#!/usr/bin/env bash", "", "alias test='echo test'"];
+      const filePath = createShellStartupScript(lines, ".bashrc");
+      const fileContent = fs.readFileSync(filePath, "utf-8");
+      
+      const result = appendAliasesToFile([], fileContent, filePath);
+      
+      assert.strictEqual(result.addedCount, 0, "Should add 0 aliases");
+      assert.strictEqual(result.existingCount, 0, "Should find 0 existing aliases");
+      assert.strictEqual(result.failedCount, 0, "Should have 0 failed aliases");
+      
+      const updatedContent = readAndDeleteFile(filePath);
+      assert.ok(updatedContent.includes("alias test='echo test'"), "Original content should remain");
+    });
+
+    it("should handle partial substring matches correctly", () => {
+      const lines = [
+        "#!/usr/bin/env bash",
+        "",
+        "alias npmx='some-other-command'", // Contains 'npm' but shouldn't match 'alias npm='
+        "alias test='echo test'"
+      ];
+      const filePath = createShellStartupScript(lines, ".bashrc");
+      const fileContent = fs.readFileSync(filePath, "utf-8");
+      
+      const aliases = ["alias npm='aikido-npm'"];
+      const result = appendAliasesToFile(aliases, fileContent, filePath);
+      
+      assert.strictEqual(result.addedCount, 1, "Should add 1 alias (npm)");
+      assert.strictEqual(result.existingCount, 0, "Should find 0 existing aliases");
+      assert.strictEqual(result.failedCount, 0, "Should have 0 failed aliases");
+      
+      const updatedContent = readAndDeleteFile(filePath);
+      assert.ok(updatedContent.includes("alias npm='aikido-npm'"), "npm alias should be added");
+      assert.ok(updatedContent.includes("alias npmx='some-other-command'"), "npmx alias should remain");
+    });
+
+    it("should handle file with only whitespace", () => {
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      const fileContent = `${EOL}${EOL}   ${EOL}`;
+      fs.writeFileSync(filePath, fileContent, "utf-8");
+      
+      const aliases = ["alias npm='aikido-npm'"];
+      const result = appendAliasesToFile(aliases, fileContent, filePath);
+      
+      assert.strictEqual(result.addedCount, 1, "Should add 1 alias");
+      assert.strictEqual(result.existingCount, 0, "Should find 0 existing aliases");
+      assert.strictEqual(result.failedCount, 0, "Should have 0 failed aliases");
+      
+      const updatedContent = fs.readFileSync(filePath, "utf-8");
+      assert.ok(updatedContent.includes("alias npm='aikido-npm'"), "Alias should be added");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+  });
+
+  describe("appendAliasesToFile error handling", () => {
+    it("should handle file permission errors gracefully", () => {
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      fs.writeFileSync(filePath, "#!/usr/bin/env bash", "utf-8");
+      
+      // Make file read-only to simulate permission error
+      fs.chmodSync(filePath, 0o444);
+      
+      const aliases = ["alias npm='aikido-npm'"];
+      const fileContent = fs.readFileSync(filePath, "utf-8");
+      
+      const result = appendAliasesToFile(aliases, fileContent, filePath);
+      
+      assert.strictEqual(result.addedCount, 0, "Should add 0 aliases due to permission error");
+      assert.strictEqual(result.existingCount, 0, "Should find 0 existing aliases");
+      assert.strictEqual(result.failedCount, 1, "Should have 1 failed alias");
+      
+      // Restore permissions and cleanup
+      fs.chmodSync(filePath, 0o644);
+      fs.rmSync(filePath, { force: true });
+    });
+  });
+});
+
+function createShellStartupScript(lines, fileExtension) {
+  const randomFileName = Math.random().toString(36).substring(2, 15);
+  const filePath = `${tmpdir()}/${randomFileName}${fileExtension}`;
+  fs.writeFileSync(filePath, lines.join(EOL), "utf-8");
+  return filePath;
+}
+
+function readAndDeleteFile(filePath) {
+  const fileContent = fs.readFileSync(filePath, "utf-8");
+  fs.rmSync(filePath, { force: true });
+  return fileContent.split(EOL);
+}
+
+function countOccurrences(lines, searchString) {
+  let count = 0;
+  for (const line of lines) {
+    if (line.includes(searchString)) {
+      count++;
+    }
+  }
+  return count;
+}

src/shell-integration/shellDetection.js

@@ -0,0 +1,75 @@
+import * as os from "os";
+import { execSync } from "child_process";
+
+const shellList = {
+  bash: {
+    name: "Bash",
+    executable: "bash",
+    getStartupFileCommand: "echo ~/.bashrc",
+  },
+  zsh: {
+    name: "Zsh",
+    executable: "zsh",
+    getStartupFileCommand: "echo ${ZDOTDIR:-$HOME}/.zshrc",
+  },
+  fish: {
+    name: "Fish",
+    executable: "fish",
+    getStartupFileCommand: "echo ~/.config/fish/config.fish",
+  },
+  powershell: {
+    name: "PowerShell Core",
+    executable: "pwsh",
+    getStartupFileCommand: "echo $PROFILE",
+  },
+  windowsPowerShell: {
+    name: "Windows PowerShell",
+    executable: "powershell",
+    getStartupFileCommand: "echo $PROFILE",
+  },
+};
+
+export function detectShells() {
+  let availableShells = [];
+
+  for (const shellName of Object.keys(shellList)) {
+    const shell = shellList[shellName];
+
+    if (isShellAvailable(shell)) {
+      const startupFile = getShellStartupFile(shell);
+      availableShells.push({
+        name: shell.name,
+        executable: shell.executable,
+        startupFile: startupFile || null,
+      });
+    }
+  }
+
+  return availableShells;
+}
+
+function isShellAvailable(shell) {
+  try {
+    if (os.platform() === "win32") {
+      execSync(`where ${shell.executable}`, { stdio: "ignore" });
+    } else {
+      execSync(`which ${shell.executable}`, { stdio: "ignore" });
+    }
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function getShellStartupFile(shell) {
+  try {
+    const command = shell.getStartupFileCommand;
+    const output = execSync(command, {
+      encoding: "utf8",
+      shell: shell.executable,
+    }).trim();
+    return output;
+  } catch {
+    return null;
+  }
+}

src/shell-integration/teardown.js

@@ -0,0 +1,140 @@
+import chalk from "chalk";
+import { ui } from "../environment/userInteraction.js";
+import { detectShells } from "./shellDetection.js";
+import { getAliases } from "./helpers.js";
+import fs from "fs";
+import { EOL } from "os";
+
+export async function teardown() {
+  ui.writeInformation(
+    chalk.bold("Removing shell aliases.") +
+      " This will remove safe-chain aliases for npm, npx, and yarn commands."
+  );
+  ui.emptyLine();
+
+  try {
+    const shells = detectShells();
+    if (shells.length === 0) {
+      ui.writeError("No supported shells detected. Cannot remove aliases.");
+      return;
+    }
+
+    ui.writeInformation(
+      `Detected ${shells.length} supported shell(s): ${shells
+        .map((shell) => chalk.bold(shell.name))
+        .join(", ")}.`
+    );
+
+    let updatedCount = 0;
+    for (const shell of shells) {
+      if (removeAliasesForShell(shell)) {
+        updatedCount++;
+      }
+    }
+
+    if (updatedCount > 0) {
+      ui.emptyLine();
+      ui.writeInformation(`Please restart your terminal to apply the changes.`);
+    }
+  } catch (error) {
+    ui.writeError(
+      `Failed to remove shell aliases: ${error.message}. Please check your shell configuration.`
+    );
+    return;
+  }
+}
+
+/**
+ * This function removes aliases for the given shell.
+ * It reads the shell's startup file (eg ~/.bashrc, ~/.zshrc, etc.),
+ * and then removes the aliases for npm, npx, and yarn commands.
+ * If the aliases don't exist, it will report that they were not found.
+ * If the startup file does not exist, it will report that no aliases need to be removed.
+ *
+ * The shell startup script is loaded by the respective shell when it starts.
+ * This means that the aliases will be removed from the shell after it is restarted.
+ */
+function removeAliasesForShell(shell) {
+  if (!shell.startupFile) {
+    ui.writeError(
+      `- ${chalk.bold(
+        shell.name
+      )}: no startup file found. Cannot remove aliases.`
+    );
+    return false;
+  }
+
+  if (!fs.existsSync(shell.startupFile)) {
+    ui.writeInformation(
+      `- ${chalk.bold(
+        shell.name
+      )}: startup file does not exist. No aliases to remove.`
+    );
+    return false;
+  }
+
+  const aliases = getAliases(shell.startupFile);
+  const fileContent = fs.readFileSync(shell.startupFile, "utf-8");
+  const { removedCount, notFoundCount } = removeAliasesFromFile(
+    aliases,
+    fileContent,
+    shell.startupFile
+  );
+
+  let summary = "- " + chalk.bold(shell.name) + ": ";
+
+  if (removedCount > 0) {
+    summary += chalk.green(`${removedCount} aliases were removed`);
+  }
+  if (notFoundCount > 0) {
+    if (removedCount > 0) {
+      summary += ", ";
+    }
+    summary += chalk.yellow(`${notFoundCount} aliases were not found`);
+  }
+  if (removedCount === 0 && notFoundCount === 0) {
+    summary += chalk.yellow("no aliases found to remove");
+  }
+
+  ui.writeInformation(summary);
+  return removedCount > 0;
+}
+
+/**
+ * This function removes the aliases from the startup file.
+ * It searches for exact matches of each alias line and removes them.
+ * eg: for bash it will remove 'alias npm="aikido-npm"' for npm from ~/.bashrc
+ * @returns an object with the counts of removed and not found aliases.
+ */
+export function removeAliasesFromFile(aliases, fileContent, startupFilePath) {
+  let removedCount = 0;
+  let notFoundCount = 0;
+  let updatedContent = fileContent;
+
+  for (const alias of aliases) {
+    const lines = updatedContent.split(EOL);
+    let aliasLineIndex = lines.findIndex((line) => line.trim() === alias);
+
+    if (aliasLineIndex !== -1) {
+      removedCount++;
+
+      // Remove all occurrences of the alias line, in case it appears multiple times
+      while (aliasLineIndex !== -1) {
+        lines.splice(aliasLineIndex, 1);
+        aliasLineIndex = lines.findIndex((line) => line.trim() === alias);
+      }
+      updatedContent = lines.join(EOL);
+    } else {
+      notFoundCount++;
+    }
+  }
+
+  if (removedCount > 0) {
+    fs.writeFileSync(startupFilePath, updatedContent, "utf-8");
+  }
+
+  return {
+    removedCount,
+    notFoundCount,
+  };
+}

src/shell-integration/teardown.spec.js

@@ -0,0 +1,177 @@
+import { describe, it } from "node:test";
+import assert from "node:assert";
+import { EOL, tmpdir } from "node:os";
+import fs from "node:fs";
+import { getAliases } from "./helpers.js";
+import { removeAliasesFromFile } from "./teardown.js";
+
+describe("teardown", () => {
+  function runRemovalTestsForEnvironment(shell, startupExtension, expectedAliases) {
+    describe(`${shell} shell removal`, () => {
+      it(`should remove aliases from ${shell} file`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, "", ...expectedAliases, ""];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        // Test the removeAliasesFromFile function directly
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = removeAliasesFromFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.removedCount, 3, "Should remove 3 aliases");
+        assert.strictEqual(result.notFoundCount, 0, "Should find all aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.ok(!updatedContent.includes(alias), `Alias "${alias}" should be removed`);
+        }
+      });
+
+      it(`should handle file with no aliases for ${shell}`, () => {
+        const lines = [`#!/usr/bin/env ${shell}`, "", "alias other='command'", ""];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = removeAliasesFromFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.removedCount, 0, "Should remove 0 aliases");
+        assert.strictEqual(result.notFoundCount, 3, "Should report 3 aliases not found");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        assert.ok(updatedContent.includes("alias other='command'"), "Other aliases should remain unchanged");
+      });
+
+      it(`should remove duplicate aliases from ${shell} file`, () => {
+        const lines = [
+          `#!/usr/bin/env ${shell}`,
+          "",
+          ...expectedAliases,
+          "alias other='command'",
+          ...expectedAliases, // duplicates
+          ""
+        ];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = removeAliasesFromFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.removedCount, 3, "Should remove 3 aliases (counting duplicates as single removal)");
+        assert.strictEqual(result.notFoundCount, 0, "Should find all aliases");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        for (const alias of expectedAliases) {
+          assert.ok(!updatedContent.includes(alias), `Alias "${alias}" should be completely removed`);
+        }
+        assert.ok(updatedContent.includes("alias other='command'"), "Other aliases should remain");
+      });
+
+      it(`should use real getAliases() for ${shell} file`, () => {
+        const filePath = `${tmpdir()}/test${startupExtension}`;
+        const aliases = getAliases(filePath);
+        
+        // Verify we get the expected aliases for this shell type
+        assert.strictEqual(aliases.length, 3, "Should get 3 aliases (npm, npx, yarn)");
+        for (let i = 0; i < aliases.length; i++) {
+          assert.strictEqual(aliases[i], expectedAliases[i], `Alias ${i} should match expected format`);
+        }
+      });
+
+      it(`should handle partial alias matches for ${shell}`, () => {
+        const lines = [
+          `#!/usr/bin/env ${shell}`,
+          "",
+          expectedAliases[0], // Only first alias
+          "alias other='command'",
+          ""
+        ];
+        const filePath = createShellStartupScript(lines, startupExtension);
+        
+        const aliases = getAliases(filePath);
+        const fileContent = fs.readFileSync(filePath, "utf-8");
+        
+        const result = removeAliasesFromFile(aliases, fileContent, filePath);
+        
+        assert.strictEqual(result.removedCount, 1, "Should remove 1 alias");
+        assert.strictEqual(result.notFoundCount, 2, "Should report 2 aliases not found");
+        
+        const updatedContent = readAndDeleteFile(filePath);
+        assert.ok(!updatedContent.includes(expectedAliases[0]), "First alias should be removed");
+        assert.ok(updatedContent.includes("alias other='command'"), "Other aliases should remain");
+      });
+    });
+  }
+
+  // Test for each shell type using real getAliases() output
+  runRemovalTestsForEnvironment("bash", ".bashrc", [
+    "alias npm='aikido-npm'",
+    "alias npx='aikido-npx'",
+    "alias yarn='aikido-yarn'"
+  ]);
+
+  runRemovalTestsForEnvironment("zsh", ".zshrc", [
+    "alias npm='aikido-npm'",
+    "alias npx='aikido-npx'",
+    "alias yarn='aikido-yarn'"
+  ]);
+
+  runRemovalTestsForEnvironment("fish", ".fish", [
+    'alias npm "aikido-npm"',
+    'alias npx "aikido-npx"',
+    'alias yarn "aikido-yarn"'
+  ]);
+
+  runRemovalTestsForEnvironment("pwsh", ".ps1", [
+    "Set-Alias npm aikido-npm",
+    "Set-Alias npx aikido-npx",
+    "Set-Alias yarn aikido-yarn"
+  ]);
+
+  describe("removeAliasesFromFile edge cases", () => {
+    it("should handle empty file", () => {
+      const aliases = ["alias npm='aikido-npm'"];
+      const fileContent = "";
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      fs.writeFileSync(filePath, fileContent, "utf-8");
+      
+      const result = removeAliasesFromFile(aliases, fileContent, filePath);
+      
+      assert.strictEqual(result.removedCount, 0, "Should remove 0 aliases from empty file");
+      assert.strictEqual(result.notFoundCount, 1, "Should report 1 alias not found");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+
+    it("should handle file with only whitespace", () => {
+      const aliases = ["alias npm='aikido-npm'"];
+      const fileContent = `${EOL}${EOL}   ${EOL}`;
+      const filePath = `${tmpdir()}/test-${Math.random().toString(36).substring(2, 15)}.bashrc`;
+      fs.writeFileSync(filePath, fileContent, "utf-8");
+      
+      const result = removeAliasesFromFile(aliases, fileContent, filePath);
+      
+      assert.strictEqual(result.removedCount, 0, "Should remove 0 aliases from whitespace-only file");
+      assert.strictEqual(result.notFoundCount, 1, "Should report 1 alias not found");
+      
+      // Cleanup
+      fs.rmSync(filePath, { force: true });
+    });
+  });
+});
+
+function createShellStartupScript(lines, fileExtension) {
+  const randomFileName = Math.random().toString(36).substring(2, 15);
+  const filePath = `${tmpdir()}/${randomFileName}${fileExtension}`;
+  fs.writeFileSync(filePath, lines.join(EOL), "utf-8");
+  return filePath;
+}
+
+function readAndDeleteFile(filePath) {
+  const fileContent = fs.readFileSync(filePath, "utf-8");
+  fs.rmSync(filePath, { force: true });
+  return fileContent.split(EOL);
+}