ngcc generate inline sourcemaps in .d.ts files and break completely DX

[tonivj5]

🐞 bug report

Affected Package

The issue is caused by package @angular/ALL

Is this a regression?

I think yes, the previous version in which this bug was not present was: I don't know, maybe 8.x.x.

Description

When ngcc run it appends a massive source-map at the end of definition files (.d.ts) in every angular package, and it gets stuck my code editor (vscode). I have to restart vscode to kill the tsserver, and avoid to enter to any angular's file definition.

🔬 Minimal Reproduction

ng new ..., npm run start (to run ngcc) and follow, for example, Component definition to its .d.ts file at @angular/core. VSCode and ng-language-service take a lot of time to process the file and consume a lot of CPU.

🔥 Exception or Error

🌍 Your Environment

Angular Version:

Angular CLI: 9.1.6
Node: 13.7.0
OS: linux x64

Angular: 9.1.9
... animations, common, compiler, compiler-cli, core, forms
... localize, platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.901.6
@angular-devkit/build-optimizer   0.901.6
@angular-devkit/build-webpack     0.901.6
@angular-devkit/core              8.3.25
@angular-devkit/schematics        8.3.25
@angular/cdk                      9.2.4
@angular/cli                      9.1.6
@ngtools/webpack                  9.1.6
@schematics/angular               9.1.6
@schematics/update                0.901.6
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0
    
Done in 0.58s.

Anything else relevant?

[petebacondarwin]

Currently ngcc tries to guess whether to add source-mapping inline or as an external file.
It does seem strange that the d.ts files are getting inline source-maps since the originals do not have one...

[tonivj5]

As a workaround (meanwhile it's fixed), I'm removing source-maps by hand... but it's a pain 😓

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