Angular 5 - Unprepared ReferenceError: req not defined

Question

I recently upgraded the current project from Angular 4.4.3 to Angular5. I upgraded all Angular packages to Angular 5.0.0 in accordance with the upgrade guide.

Plus, I also updated the Angular CLI to 1.5.0. Since then, I get below console errors:

polyfills.b8a5e5b….bundle.js:1 Uncaught ReferenceError: req is not defined
    at polyfills.b8a5e5b….bundle.js:1
    at polyfills.b8a5e5b….bundle.js:1
    at polyfills.b8a5e5b….bundle.js:1
    at Function.r.__load_patch (polyfills.b8a5e5b….bundle.js:1)
    at polyfills.b8a5e5b….bundle.js:1
    at c (polyfills.b8a5e5b….bundle.js:1)
    at Object.<anonymous> (polyfills.b8a5e5b….bundle.js:1)
    at Object.eFQL (polyfills.b8a5e5b….bundle.js:1)
    at n (inline.904a54f….bundle.js:1)
    at Object.TU+8 (polyfills.b8a5e5b….bundle.js:1)

Am I missing something?

Answer 1

Remove node_modulesand run npm install.

This works for me.

Answer 2

This is actually just a mistake with uglify-es. Upgrade uglify-esyour project to >3.1.8until it is fixed in the CLI. Got a response from here

Answer 3

, CLI uglify-es. CLI 1.4.9.

:

• node_modules .

• npm install

• Ctrl+Windows → %appdata% → npm → node_modules → @angular

• cli

• CLI npm install -g @angular/cli@1.4.9

Answer 4

• npm (npm cache clear --force)
• node_modules
• (npm install)
• uglify-es (npm install uglify-es@latest)
• 1.6.0-beta.0 @angular/cli ( , [npm install @angular/cli@1.6.0-beta.0])
• , npm, Angular 5
• ,

, 5, .