Error: Angular JIT compilation failed: '@angular/compiler' not loaded!

🐞 bug report

Affected Package

Not sure, but maybe @angular/compiler or @angular/cli

Is this a regression?

Yes it was working with angular 8 and I think angular 9. (I’ve migrated both in a row after doing some test in V9 to check it was working. But maybe I’ve missed something in my tests) I’m trying to complete migration, no compilation error, apps run in browser as long as I don’t set optimization build option in angular.json

Description

If I set "optimization": true in angular.json I have the following error in my browser (no compilation error even with AOT)

main-es2015.83cd1a7f2902ea042a79.js:1 Error: Angular JIT compilation failed: '@angular/compiler' not loaded!
  - JIT compilation is discouraged for production use-cases! Consider AOT mode instead.
  - Did you bootstrap using '@angular/platform-browser-dynamic' or '@angular/platform-server'?
  - Alternatively provide the compiler with 'import "@angular/compiler";' before bootstrapping.

🔬 Minimal Reproduction

Currently don’t manage to isolate where the issue comes from so I’m not able to create a reproduction sample repo. I know I have some custom bootstraping pre-process, but I don’t think that’s the issue Ivy is on (wasn’t in V8 and V9), OAT is and was on, optimization was on too when I was in V8

🔥 Exception or Error

main-es2015.83cd1a7f2902ea042a79.js:1 Error: Angular JIT compilation failed: '@angular/compiler' not loaded!
  - JIT compilation is discouraged for production use-cases! Consider AOT mode instead.
  - Did you bootstrap using '@angular/platform-browser-dynamic' or '@angular/platform-server'?
  - Alternatively provide the compiler with 'import "@angular/compiler";' before bootstrapping.
    at z (main-es2015.83cd1a7f2902ea042a79.js:1)
    at Function.get (main-es2015.83cd1a7f2902ea042a79.js:1)
    at We (main-es2015.83cd1a7f2902ea042a79.js:1)
    at cs (main-es2015.83cd1a7f2902ea042a79.js:1)
    at main-es2015.83cd1a7f2902ea042a79.js:1
    at os.processProvider (main-es2015.83cd1a7f2902ea042a79.js:1)
    at main-es2015.83cd1a7f2902ea042a79.js:1
    at main-es2015.83cd1a7f2902ea042a79.js:1
    at Array.forEach (<anonymous>)
    at we (main-es2015.83cd1a7f2902ea042a79.js:1)

🌍 Your Environment

Angular Version:

Angular CLI: 10.0.5
Node: 14.8.0
OS: win32 x64

Angular: 10.0.8
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.1000.5
@angular-devkit/build-angular      0.1000.5
@angular-devkit/build-ng-packagr   0.1000.5
@angular-devkit/build-optimizer    0.1000.5
@angular-devkit/build-webpack      0.1000.5
@angular-devkit/core               10.0.5
@angular-devkit/schematics         10.0.5
@angular-devkit/schematics-cli     0.1000.5
@angular/cdk                       10.1.3
@angular/cli                       10.0.5
@angular/flex-layout               10.0.0-beta.32
@angular/http                      7.2.16
@angular/material                  10.1.3
@angular/material-moment-adapter   10.1.3
@angular/pwa                       0.1000.5
@ngtools/webpack                   10.0.5
@schematics/angular                10.0.5
@schematics/schematics             0.1000.5
@schematics/update                 0.1000.5
ng-packagr                         10.0.3
rxjs                               6.6.2
typescript                         3.9.7
webpack                            4.43.0

Anything else relevant?

[petebacondarwin]

@no-more - could you provide a runnable reproduction of this issue? It is very hard to debug just from the error message.

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