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

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

.gitignore

@@ -32,3 +32,4 @@ user-code/
 # Logs from scripts
 script/logs/
 external-link-checker-db.json
+.installed.package-lock.json

.npmrc

@@ -1,2 +1,7 @@
 # skip installing optional dependencies to avoid issues with troublesome `fsevents` module
 omit=optional
+
+# For 15-25% faster npm install
+# https://www.peterbe.com/plog/benchmarking-npm-install-with-or-without-audit
+# Also we have Dependabot alerts configured in the GitHub repo.
+audit=false

package.json

@@ -198,6 +198,7 @@
     "prevent-pushes-to-main": "node script/prevent-pushes-to-main.js",
     "rest-dev": "src/rest/scripts/update-files.js",
     "show-action-deps": "echo 'Action Dependencies:' && rg '^[\\s|-]*(uses:.*)$' .github -I -N --no-heading -r '$1$2' | sort | uniq | cut -c 7-",
+    "prestart": "script/cmp-files.js package-lock.json .installed.package-lock.json || npm install && cp package-lock.json .installed.package-lock.json",
     "start": "cross-env NODE_ENV=development ENABLED_LANGUAGES=en nodemon server.js",
     "start-all-languages": "cross-env NODE_ENV=development nodemon server.js",
     "sync-search": "cross-env NODE_OPTIONS='--max_old_space_size=8192' start-server-and-test sync-search-server 4002 sync-search-indices",

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
+    }
+  }
+}