add postinstall script to add the safe npm alias

lib/utils/safe-npm.js

@@ -0,0 +1,72 @@
+import { exec } from 'child_process'
+import fs from 'fs'
+import homedir from 'os'
+import readline from 'readline'
+
+console.log(`
+ _____         _       _
+|   __|___ ___| |_ ___| |_
+|__   | . |  _| '_| -_|  _|
+|_____|___|___|_,_|___|_|
+
+`)
+
+/**
+ * @param {string} query
+ * @returns {void}
+ */
+const installSafeNpm = (query) => {
+  const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+  })
+  return askQuestion(rl, query)
+}
+
+/**
+ * @param {any} rl
+ * @param {string} query
+ * @returns {void}
+ */
+const askQuestion = (rl, query) => {
+  rl.question(query, (/** @type {string} */ ans) => {
+    if (ans.toLowerCase() === 'y') {
+      const bashFile = `${homedir.homedir()}/.bashrc`
+      const zshBashFile = `${homedir.homedir()}/.zshrc`
+
+      try {
+        if (fs.existsSync(bashFile)) {
+          addAlias(bashFile)
+        } else if (fs.existsSync(zshBashFile)) {
+          addAlias(zshBashFile)
+        }
+      } catch (e) {
+        throw new Error('There was an issue setting up the alias.', { cause: e })
+      }
+      rl.close()
+    } else if (ans.toLowerCase() !== 'n') {
+      askQuestion(rl, 'Incorrect input: please enter either y (yes) or n (no): ')
+    } else {
+      rl.close()
+    }
+  })
+}
+
+/**
+ * @param {string} file
+ * @returns {void}
+ */
+const addAlias = (file) => {
+  exec(`echo "alias npm='socket npm' \nalias npx='socket npx'" >> ${file}`, (err, _, stderr) => {
+    if (err) {
+      return new Error(`There was an error setting up the alias: ${stderr}`)
+    }
+    console.log(`The alias was added to ${file}. Running 'npm install' will now be wrapped in Socket's "safe npm" 🎉`)
+  })
+}
+
+installSafeNpm(`The Socket CLI is now successfully installed! 🎉
+
+To better protect yourself against supply-chain attacks, our "safe npm" wrapper can warn you about malicious packages whenever you run 'npm install'.
+
+Do you want to install "safe npm" (this will create an alias to the socket-npm command)? (y/n)`)

package.json

@@ -40,7 +40,8 @@
     "prepare": "husky install",
     "test:unit": "c8 --reporter=lcov --reporter text node --test",
     "test-ci": "run-s test:*",
-    "test": "run-s check test:*"
+    "test": "run-s check test:*",
+    "postinstall": "node lib/utils/safe-npm.js"
   },
   "devDependencies": {
     "@socketsecurity/eslint-config": "^3.0.1",