fix: skip update notifier file if not requested

Author: lukekarrys

lib/utils/update-notifier.js

@@ -11,6 +11,8 @@ const stat = promisify(require('fs').stat)
 const writeFile = promisify(require('fs').writeFile)
 const { resolve } = require('path')
 
+const SKIP = Symbol('SKIP')
+
 const isGlobalNpmUpdate = npm => {
   return npm.flatOptions.global &&
     ['install', 'update'].includes(npm.command) &&
@@ -38,7 +40,7 @@ const updateNotifier = async (npm, spec = 'latest') => {
   if (!npm.config.get('update-notifier') ||
       isGlobalNpmUpdate(npm) ||
       ciDetect()) {
-    return null
+    return SKIP
   }
 
   // if we're on a prerelease train, then updates are coming fast
@@ -118,6 +120,12 @@ const updateNotifier = async (npm, spec = 'latest') => {
 // only update the notification timeout if we actually finished checking
 module.exports = async npm => {
   const notification = await updateNotifier(npm)
+
+  // dont write the file if we skipped checking altogether
+  if (notification === SKIP) {
+    return null
+  }
+
   // intentional.  do not await this.  it's a best-effort update.  if this
   // fails, it's ok.  might be using /dev/null as the cache or something weird
   // like that.