Yarn PnP Compatibility

Is this a bug report?

Yes

Clone DanielRuf/coding-coach, checkout the feature/yarn-pnp branch and install with Yarn nightly and run yarn start.

Module build failed: Error: Failed to load plugin flowtype: Package "eslint@4.10.0" (via "/Users/druf/Library/Caches/Yarn/v3/npm-eslint-4.10.0-f25d0d7955c81968c2309aa5c9a229e045176bb7/node_modules/eslint/lib/config/plugins.js") is trying to require the package "eslint-plugin-flowtype" (via "eslint-plugin-flowtype") without it being listed in its dependencies (ajv, babel-code-frame, chalk, concat-stream, cross-spawn, debug, doctrine, eslint-scope, espree, esquery, estraverse, esutils, file-entry-cache, functional-red-black-tree, glob, globals, ignore, imurmurhash, inquirer, is-resolvable, js-yaml, json-stable-stringify, levn, lodash, minimatch, mkdirp, natural-compare, optionator, path-is-inside, pluralize, progress, require-uncached, semver, strip-ansi, strip-json-comments, table, text-table, eslint)
Referenced from: 
    at Array.forEach (<anonymous>)
    at Array.reduceRight (<anonymous>)

Did you try recovering your dependencies?

Not needed as this is a clean install.

Which terms did you search for in User Guide?

Environment

The project uses react-scripts@1.1.5.

(paste the output of the command here)

Steps to Reproduce

Clone DanielRuf/coding-coach, checkout the feature/yarn-pnp branch and install with Yarn nightly and run yarn start.

1. Clone DanielRuf/coding-coach
2. checkout the feature/yarn-pnp branch
3. install Yarn nightly
4. run yarn && yarn start

Expected Behavior

(Write what you thought would happen.)

It should run without any errors.

Actual Behavior

I’ve got

Module build failed: Error: Failed to load plugin flowtype: Package "eslint@4.10.0" (via "/Users/druf/Library/Caches/Yarn/v3/npm-eslint-4.10.0-f25d0d7955c81968c2309aa5c9a229e045176bb7/node_modules/eslint/lib/config/plugins.js") is trying to require the package "eslint-plugin-flowtype" (via "eslint-plugin-flowtype") without it being listed in its dependencies (ajv, babel-code-frame, chalk, concat-stream, cross-spawn, debug, doctrine, eslint-scope, espree, esquery, estraverse, esutils, file-entry-cache, functional-red-black-tree, glob, globals, ignore, imurmurhash, inquirer, is-resolvable, js-yaml, json-stable-stringify, levn, lodash, minimatch, mkdirp, natural-compare, optionator, path-is-inside, pluralize, progress, require-uncached, semver, strip-ansi, strip-json-comments, table, text-table, eslint)
Referenced from: 
    at Array.forEach (<anonymous>)
    at Array.reduceRight (<anonymous>)

Reproducible Demo

(Paste the link to an example project and exact instructions to reproduce the issue.)

[arcanis]

• A Yarn bug was preventing webpack-dev-middleware to access webpack - will be fixed with https://github.com/yarnpkg/yarn/pull/6443

• A dependency was missing from react-dev-utils - fixed with #5134

• The pnp-webpack-plugin was missing - will be fixed with #5136

• The thread-loader package doesnt forward process.execArgv to the spawned threads, preventing them from loading their dependencies since the hook isn’t setup in their environment - will be fixed with #5136

[arcanis]

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