[Angular 9.0.4] Building throws `ERROR in Error when flattening the source-map "[...].d.ts.map" for "[...].d.ts": Maximum call stack size exceeded`

🐞 bug report

Affected Package

Probably @angular/cli, but I was asked to open the issue here.

Is this a regression?

Yes. The issue does not occur with Angular 9.0.2. Version 9.0.3 causes a different RangeError: Maximum call stack size exceeded error, tracked here: https://github.com/angular/angular-cli/issues/17106.

Description

Building and serving both fail consistently with a bunch of the following messages:

ERROR in Error when flattening the source-map "[/path/to/file1].d.ts.map" for "[/path/to/file1].d.ts": RangeError: Maximum call stack size exceeded
ERROR in Error when flattening the source-map "[/path/to/file2].d.ts.map" for "[/path/to/file2].d.ts": RangeError: Maximum call stack size exceeded
...
ERROR in Error when flattening the source-map "[/path/to/fileN].d.ts.map" for "[/path/to/fileN].d.ts": RangeError: Maximum call stack size exceeded

The issue seems similar to the above mentioned one and deleting node_modules does not fix it.

My setup is an Angular workspace with two projects: an app and a lib. The source-maps being “flattened” when the error occurs belong to the lib. The error occurs when attempting to build (--prod or otherwise) or serve the app.

🌍 Your Environment

Angular Version:

Angular CLI: 9.0.4
Node: 13.9.0
OS: linux x64

Angular: 9.0.4
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                            Version
------------------------------------------------------------
@angular-devkit/architect          0.900.4
@angular-devkit/build-angular      0.900.4
@angular-devkit/build-ng-packagr   0.900.4
@angular-devkit/build-optimizer    0.900.4
@angular-devkit/build-webpack      0.900.4
@angular-devkit/core               9.0.4
@angular-devkit/schematics         9.0.4
@angular/cdk                       9.1.0
@ngtools/webpack                   9.0.4
@schematics/angular                9.0.4
@schematics/update                 0.900.4
ng-packagr                         9.0.2
rxjs                               6.5.4
typescript                         3.7.5
webpack                            4.41.2

[jonstelly]

I was getting this after an upgrade from 9.0.2 -> 9.0.4. Deleting node_modules didn’t fix it, but deleting both node_modules and dist folders then npm ci and rebuild/re-serve did the trick.

I’ve got a slightly odd layout, a framework workspace and a separate application workspace that uses tsconfig.json paths to reference the framework packages out of their built dist folders.

[stephanecot]

with angular 9, there is a incremental build process which is in the /dist folder.