Bug: Using --pnp breaks the angular build tool (ng) - failure to resolve dependency

[samsieber]

Using yarn pnp seems to break the angular build tool (ng). Not sure where to start on debugging this - should I be filing this in the angular-cli repository instead?

What is the current behavior?
When running the ng command from the local depedency (e.g. yarn build where build task is defined as "ng" fails with the following error:

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)

Steps to reproduce.

1. Clone https://github.com/samsieber/ng-demo
2. Go into it
3. Runyarn --pnp
4. Runyarn build

Expected behavior?
I'd expect that the step 4, yarn build would output something like

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.

Which is what it currently outputs in non-pnp mode

Please mention your node.js, yarn and operating system version.
OS: OSX 10.13.6
Yarn Version: RC 1.12.0

[arcanis]

The stacktrace seems to indicate that Angular is implementing its own resolution:

/Users/ssieber/Library/Caches/Yarn/v3/npm-@angular-devkit-core-0.6.8-3b09d97bd2588f0091df11921f7ed772431806aa/node_modules/@angular-devkit/core/node/resolve.js

Do you mind opening an issue on Angular and linking it there? I'll shim in to see if there's anything we can do. For what it's worth, integrating with the PnP API is usually quite simple, cf the Jest plugin.

[laurencefass]

subscribing.

this is still broken with yarn 1.19.1
raised related issue here: #7746

[paul-soporan]

Closing as Angular PnP support is tracked here: yarnpkg/berry#266