Automatically run npm install when running npm start (#35283)

Co-authored-by: Robert Sese <734194+rsese@users.noreply.github.com>

script/cmp-files.js

@@ -0,0 +1,31 @@
+#!/usr/bin/env node
+
+// [start-readme]
+//
+// Given N files. Exit 0 if they all exist and are identical in content.
+//
+// [end-readme]
+
+import fs from 'fs'
+
+import { program } from 'commander'
+
+program.description('Compare N files').arguments('[files...]', '').parse(process.argv)
+
+main(program.args)
+
+function main(files) {
+  if (files.length < 2) throw new Error('Must be at least 2 files')
+  try {
+    const contents = files.map((file) => fs.readFileSync(file, 'utf-8'))
+    if (new Set(contents).size > 1) {
+      process.exit(1)
+    }
+  } catch (error) {
+    if (error.code === 'ENOENT') {
+      process.exit(1)
+    } else {
+      throw error
+    }
+  }
+}