fix(context): pass rootContext

[qnighy]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

When used with sass-loader and { sourceMap: true }, it fails with the following message:

[2] ERROR in ./path/tofoo.scss
[2] Module build failed (from $CWD/node_modules/mini-css-extract-plugin/dist/loader.js):
[2] ModuleBuildError: Module build failed (from $CWD/node_modules/thread-loader/dist/cjs.js):
[2] Thread Loader (Worker 9)
[2] The "path" argument must be of type string. Received undefined
[2]     at PoolWorker.fromErrorObj ($CWD/node_modules/thread-loader/dist/WorkerPool.js:344:12)
[2]     at $CWD/node_modules/thread-loader/dist/WorkerPool.js:217:29
[2]     at validateString (internal/validators.js:124:11)
[2]     at Object.join (path.js:1039:7)
[2]     at getSassOptions ($CWD/node_modules/sass-loader/dist/utils.js:160:37)
[2]     at Object.loader ($CWD/node_modules/sass-loader/dist/index.js:36:49)
[2]     at $CWD/node_modules/webpack/lib/NormalModule.js:316:20
[2]     at $CWD/node_modules/loader-runner/lib/LoaderRunner.js:367:11
[2]     at $CWD/node_modules/loader-runner/lib/LoaderRunner.js:182:20
[2]     at context.callback ($CWD/node_modules/loader-runner/lib/LoaderRunner.js:111:13)
[2]     at Object.callback ($CWD/node_modules/thread-loader/dist/index.js:51:7)
[2]     at done ($CWD/node_modules/neo-async/async.js:8069:18)
[2]     at callback ($CWD/node_modules/thread-loader/dist/WorkerPool.js:183:19)
[2]     at $CWD/node_modules/thread-loader/dist/WorkerPool.js:217:15
[2]     at mapSeries ($CWD/node_modules/neo-async/async.js:3625:14)
[2]     at PoolWorker.onWorkerMessage ($CWD/node_modules/thread-loader/dist/WorkerPool.js:171:34)
[2]     at $CWD/node_modules/thread-loader/dist/WorkerPool.js:144:14
[2]     at Socket.onChunk ($CWD/node_modules/thread-loader/dist/readBuffer.js:40:9)
[2]     at Socket.emit (events.js:315:20)
[2]     at Socket.Readable.read (_stream_readable.js:519:10)
[2]     at Socket.read (net.js:625:39)
[2]     at flow (_stream_readable.js:992:34)

This PR fixes the problem by passing context.rootContext into workers.

Breaking Changes

Additional Info

[codecov]

Codecov Report

Merging #104 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #104   +/-   ##
=======================================
  Coverage   20.30%   20.30%           
=======================================
  Files           7        7           
  Lines         458      458           
  Branches       86       86           
=======================================
  Hits           93       93           
  Misses        322      322           
  Partials       43       43           

Impacted Files	Coverage Δ
src/index.js	63.63% <ø> (ø)
src/worker.js	0.00% <ø> (ø)

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[alexander-akait]

Thanks