Compilation crash: `Error: Content and Map of this Source is not available (only size() is supported)`

🐞 Bug report

Command (mark with an x)

• build
• serve

Is this a regression?

Yes, didn’t see this with Angular 12.

Description

I’m running into Error: Content and Map of this Source is not available (only size() is supported) with Angular.

This seems to have been reported in various other places recently: stackoverflow.com/questions/70066980/angular-12-content-and-map-of-this-source-is-not-available-only-size-is-suppo

I’m not sure if this is an Angular or Webpack issue, I also crossposted this to webpack: https://github.com/webpack/webpack/issues/14840

🔬 Minimal Reproduction

I don’t have a clear reproduction, however I was able to add some logs in emitAsset here, which is part of the stack trace: https://github.com/webpack/webpack/blob/14582fc41504595b04f01561ea19d27391d6b9ac/lib/Compilation.js#L4171-L4176

I added:

	emitAsset(file, source, assetInfo = {}) {
		if (this.assets[file]) {
			try {
				!isSourceEqual(this.assets[file], source);
			} catch (err) {
				console.error(file, this.assets[file], source);
				throw err;
			}

The output before the crash is:

fontawesome-webfont.eot SizeOnlySource { _size: 165742 } RawSource {
  _valueIsBuffer: true,
  _value: <Buffer 6e 87 02 00 ac 86 02 00 01 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 90 01 00 00 00 00 4c 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ... 165692 more bytes>,
  _valueAsBuffer: <Buffer 6e 87 02 00 ac 86 02 00 01 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00 90 01 00 00 00 00 4c 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ... 165692 more bytes>,
  _valueAsString: undefined
}

It always seems to crash on the same eot file. Notice that this.assets[file] for this file is a SizeOnlySource.

🔥 Exception or Error

.../node_modules/webpack-sources/lib/SizeOnlySource.js:16
                return new Error(
                       ^

Error: Content and Map of this Source is not available (only size() is supported)
    at SizeOnlySource._error (.../node_modules/webpack-sources/lib/SizeOnlySource.js:16:10)
    at SizeOnlySource.buffer (.../node_modules/webpack-sources/lib/SizeOnlySource.js:30:14)
    at _isSourceEqual (.../node_modules/webpack/lib/util/source.js:21:51)
    at isSourceEqual (.../node_modules/webpack/lib/util/source.js:43:17)
    at Compilation.emitAsset (.../node_modules/webpack/lib/Compilation.js:4155:9)
    at .../node_modules/webpack/lib/Compiler.js:546:28
    at .../node_modules/webpack/lib/Compiler.js:1127:17
    at eval (eval at create (.../node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:13:1)
The terminal process "zsh '-c', 'yarn run start'" terminated with exit code: 1.

🌍 Your Environment

Angular CLI: 13.0.2
Node: 16.13.0
Package Manager: yarn 3.1.0
OS: darwin arm64

Angular: 13.0.1
... animations, cdk, common, compiler, compiler-cli, core, forms
... language-service, material, platform-browser
... platform-browser-dynamic, router, service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1300.2
@angular-devkit/build-angular   13.0.2
@angular-devkit/core            13.0.2
@angular-devkit/schematics      13.0.2
@angular/cli                    13.0.2
@angular/flex-layout            12.0.0-beta.35
@schematics/angular             13.0.2
rxjs                            7.4.0
typescript                      4.4.4```

**Anything else relevant?**

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[lalo-mx]

@alan-agius4 The issue is not reproducible for us anymore. It has has been stable for more than a month now.

[alan-agius4]

@alan-agius4 Not 100% sure if is the same error but it crashes similarly sample-angular-13.zip

Updating to latest @angular/cli and @angular/core to 13.1.0 version appears to fix it, i will run more tests.

npm run start-fast

@lalo-mx, I downloaded the project, but I wasn’t able to reproduce the error.