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Dependency resolution is broken with 'yarn --pnp' (Yarn Plug 'n' Play)

See original GitHub issue

Bug Report or Feature Request (mark with an `x`)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Command (mark with an `x`)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Versions

ng: 6.0.0 yarn: 1.12.0 (RC) node: v8.11.3 os: OSX 10.13.6

Repro steps

Install yarn RC 1.12.0
clone https://github.com/samsieber/ng-demo
go in the cloned repo
run yarn --pnp (switches it to pnp mode)
run yarn build

The log given by the failure

Could not find module "@angular-devkit/build-angular" from "/Users/ssieber/dev/ng-yarn-pnp".
Error: Could not find module "@angular-devkit/build-angular" from "/Users/ssieber/dev/ng-yarn-pnp".
    at Object.resolve (/Users/ssieber/Library/Caches/Yarn/v3/npm-@angular-devkit-core-0.6.8-3b09d97bd2588f0091df11921f7ed772431806aa/node_modules/@angular-devkit/core/node/resolve.js:141:11)
    at Observable.rxjs_1.Observable [as _subscribe] (/Users/ssieber/Library/Caches/Yarn/v3/npm-@angular-devkit-architect-0.6.8-977acc605aba45d21b95ca704cc99492e14299dd/node_modules/@angular-devkit/architect/src/architect.js:132:40)
    at Observable._trySubscribe (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/Observable.js:44:25)
    at Observable.subscribe (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/Observable.js:30:22)
    at DoOperator.call (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/operators/tap.js:32:23)
    at Observable.subscribe (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/Observable.js:25:22)
    at /Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/util/subscribeTo.js:22:31
    at Object.subscribeToResult (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/util/subscribeToResult.js:10:45)
    at MergeMapSubscriber._innerSub (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/operators/mergeMap.js:82:29)
    at MergeMapSubscriber._tryNext (/Users/ssieber/Library/Caches/Yarn/v3/npm-rxjs-6.3.3-3c6a7fa420e844a81390fb1158a9ec614f4bad55/node_modules/rxjs/internal/operators/mergeMap.js:76:14)

Desired functionality

I’d like it work 😉 - Specifically when I’m not using yarn pnp, I get this:

yarn run v1.12.0
warning ../package.json: No license field
$ ng build
                                                                                          
Date: 2018-10-03T18:44:42.889Z
Hash: df3a0ea990e4eeeb9455
Time: 8768ms
chunk {main} main.js, main.js.map (main) 25.6 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 227 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 5.22 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 15.6 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 3.54 MB [initial] [rendered]
✨  Done in 12.48s.

Mention any other details that might be useful

This is apparently caused the build tool implementing it’s own dependency resolution. Yarn pnp provides an alternative dependency resolution that eschews node_modules. It’s an experimental feature. I’ve filed an issue in their repo, but they directed me here, since you guys seem to be using custom resolution. See yarnpkg/yarn#6482