Remove @ts-expect-error suppressions

packages/safe-chain/src/registryProxy/mitmRequestHandler.js

@@ -5,7 +5,7 @@ import { ui } from "../environment/userInteraction.js";
 
 /**
  * @param {import("http").IncomingMessage} req
- * @param {import("net").Socket} clientSocket
+ * @param {import("http").ServerResponse} clientSocket
  * @param {(target: string) => Promise<boolean>} isAllowed
  */
 export function mitmConnect(req, clientSocket, isAllowed) {
@@ -25,7 +25,6 @@ export function mitmConnect(req, clientSocket, isAllowed) {
 
   server.on("error", (err) => {
     ui.writeError(`Safe-chain: HTTPS server error: ${err.message}`);
-    // @ts-expect-error Property 'headersSent' does not exist on type 'Socket'
     if (!clientSocket.headersSent) {
       clientSocket.end("HTTP/1.1 502 Bad Gateway\r\n\r\n");
     } else if (clientSocket.writable) {
@@ -55,7 +54,13 @@ function createHttpsServer(hostname, isAllowed) {
    * @returns {Promise<void>}
    */
   async function handleRequest(req, res) {
-    // @ts-expect-error req.url might be undefined
+    if (!req.url) {
+      ui.writeError("Safe-chain: Request missing URL");
+      res.writeHead(400, "Bad Request");
+      res.end("Bad Request: Missing URL");
+      return;
+    }
+
     const pathAndQuery = getRequestPathAndQuery(req.url);
     const targetUrl = `https://${hostname}${pathAndQuery}`;
 
@@ -163,7 +168,13 @@ function createProxyRequest(hostname, req, res) {
       }
     });
 
-    // @ts-expect-error statusCode might be undefined
+    if (!proxyRes.statusCode) {
+      ui.writeError("Safe-chain: Proxy response missing status code");
+      res.writeHead(500);
+      res.end("Internal Server Error");
+      return;
+    }
+
     res.writeHead(proxyRes.statusCode, proxyRes.headers);
     proxyRes.pipe(res);
   });

packages/safe-chain/src/registryProxy/plainHttpProxy.js

@@ -1,5 +1,6 @@
 import * as http from "http";
 import * as https from "https";
+import { ui } from "../environment/userInteraction.js";
 
 /**
  * @param {import("http").IncomingMessage} req
@@ -8,7 +9,13 @@ import * as https from "https";
  * @returns {void}
  */
 export function handleHttpProxyRequest(req, res) {
-  // @ts-expect-error req.url might be undefined
+  if (!req.url) {
+    ui.writeError("Safe-chain: Request missing URL");
+    res.writeHead(400, "Bad Request");
+    res.end("Bad Request: Missing URL");
+    return;
+  }
+
   const url = new URL(req.url);
 
   // The protocol for the plainHttpProxy should usually only be http:
@@ -27,11 +34,16 @@ export function handleHttpProxyRequest(req, res) {
 
   const proxyRequest = protocol
     .request(
-      // @ts-expect-error req.url might be undefined
       req.url,
       { method: req.method, headers: req.headers },
       (proxyRes) => {
-        // @ts-expect-error statusCode might be undefined
+        if (!proxyRes.statusCode) {
+          ui.writeError("Safe-chain: Proxy response missing status code");
+          res.writeHead(500);
+          res.end("Internal Server Error");
+          return;
+        }
+
         res.writeHead(proxyRes.statusCode, proxyRes.headers);
         proxyRes.pipe(res);
 

packages/safe-chain/src/registryProxy/registryProxy.js

@@ -43,7 +43,7 @@ function getSafeChainProxyEnvironmentVariables() {
 }
 
 /**
- * @param {Record<string, string>} env
+ * @param {Record<string, string | undefined>} env
  *
  * @returns {Record<string, string>}
  */
@@ -56,7 +56,7 @@ export function mergeSafeChainProxyEnvironmentVariables(env) {
     // So we only copy the variable if it's not already set in a different case
     const upperKey = key.toUpperCase();
 
-    if (!proxyEnv[upperKey]) {
+    if (!proxyEnv[upperKey] && env[key]) {
       proxyEnv[key] = env[key];
     }
   }
@@ -122,7 +122,7 @@ function stopServer(server) {
 
 /**
  * @param {import("http").IncomingMessage} req
- * @param {import("net").Socket} clientSocket
+ * @param {import("http").ServerResponse} clientSocket
  * @param {Buffer} head
  *
  * @returns {void}
@@ -130,9 +130,9 @@ function stopServer(server) {
 function handleConnect(req, clientSocket, head) {
   // CONNECT method is used for HTTPS requests
   // It establishes a tunnel to the server identified by the request URL
+  const url = req.url;
 
-  // @ts-expect-error req.url might be undefined
-  if (knownRegistries.some((reg) => req.url.includes(reg))) {
+  if (url && knownRegistries.some((reg) => url.includes(reg))) {
     // For npm and yarn registries, we want to intercept and inspect the traffic
     // so we can block packages with malware
     mitmConnect(req, clientSocket, isAllowedUrl);

packages/safe-chain/src/registryProxy/tunnelRequestHandler.js

@@ -3,7 +3,7 @@ import { ui } from "../environment/userInteraction.js";
 
 /**
  * @param {import("http").IncomingMessage} req
- * @param {import("net").Socket} clientSocket
+ * @param {import("http").ServerResponse} clientSocket
  * @param {Buffer} head
  *
  * @returns {void}
@@ -30,7 +30,7 @@ export function tunnelRequest(req, clientSocket, head) {
 
 /**
  * @param {import("http").IncomingMessage} req
- * @param {import("net").Socket} clientSocket
+ * @param {import("http").ServerResponse} clientSocket
  * @param {Buffer} head
  *
  * @returns {void}
@@ -38,13 +38,16 @@ export function tunnelRequest(req, clientSocket, head) {
 function tunnelRequestToDestination(req, clientSocket, head) {
   const { port, hostname } = new URL(`http://${req.url}`);
 
-  // @ts-expect-error port from URL is a string but net.connect accepts number
-  const serverSocket = net.connect(port || 443, hostname, () => {
-    clientSocket.write("HTTP/1.1 200 Connection Established\r\n\r\n");
-    serverSocket.write(head);
-    serverSocket.pipe(clientSocket);
-    clientSocket.pipe(serverSocket);
-  });
+  const serverSocket = net.connect(
+    Number.parseInt(port) || 443,
+    hostname,
+    () => {
+      clientSocket.write("HTTP/1.1 200 Connection Established\r\n\r\n");
+      serverSocket.write(head);
+      serverSocket.pipe(clientSocket);
+      clientSocket.pipe(serverSocket);
+    }
+  );
 
   clientSocket.on("error", () => {
     // This can happen if the client TCP socket sends RST instead of FIN.
@@ -66,7 +69,7 @@ function tunnelRequestToDestination(req, clientSocket, head) {
 
 /**
  * @param {import("http").IncomingMessage} req
- * @param {import("net").Socket} clientSocket
+ * @param {import("http").ServerResponse} clientSocket
  * @param {Buffer} head
  * @param {string} proxyUrl
  */
@@ -75,10 +78,9 @@ function tunnelRequestViaProxy(req, clientSocket, head, proxyUrl) {
   const proxy = new URL(proxyUrl);
 
   // Connect to proxy server
-  // @ts-expect-error net.connect wants port as number but proxy.port is string
   const proxySocket = net.connect({
     host: proxy.hostname,
-    port: proxy.port,
+    port: Number.parseInt(proxy.port) || 80,
   });
 
   proxySocket.on("connect", () => {