[WIP] refactor(loader): v2.0.0

[joshwiens]

What kind of change does this PR introduce?

Did you add tests for your changes?

If relevant, did you update the README?

Summary

Does this PR introduce a breaking change?

Other information

• Fixes for Webpack 4.x
• Drops support for NodeJS 4.x
• Sets minimum peerDep to Webpack 3.x

BREAKING CHANGE: Sets engines to "node": ">= 6.9.0 || >= 8.9.0"
BREAKING CHANGE: Drops support for Webpack v2.x

[michael-ciniawsky]

Noteable Changes

Features

url (options.url)

file.css

.selector {
  background-url: url('path/to/file.png');
}

file.js

import CSS__URL__0 from 'path/to/file.png';

export default `.selector { background-url: url(${CSS__URL__0}); }`

import (options.import)

file.css

@import './path/to/import.css';

...css

file.js

import CSS__IMPORT__0 from 'path/to/import.css';

export default `${css}`

sourceMap (options.sourceMap)

• enable/disable source maps

BREAKING CHANGES

root (options.root)

• Removed

alias (options.alias)

• Removed (needs triage)

modules (options.modules|options.localIdentName|options.camelCase)

• Removed (will be a separate plugin usable via postcss-loader)

minimize (options.minimize)

• Removed

importLoaders (options.importLoaders)

• Removed (not needed anymore webpack >= v2.0.0)

Issues

ALL 😛

TODO

• Upstream
• plugins/url.js => postcss-icss-url (PR #?)
• plugins/import.js =>postcss-icss-import (PR #?)
• Triage && Add CSS Runtime

Status

Name	Status
Default	✅
CSS URLs	✅
CSS Imports	✅
CSS Runtime	❔
Options - url	✅
Options - import	✅
Options - sourceMap	✅

[ZeeCoder]

@michael-ciniawsky any way I can help with this? I believe this would include custom exports support.

[mikeumus]

This line would solve #691 in my case at least.

[michael-ciniawsky]

Closing in favor of #748 (for now)

⚠️ Please still don't deleted the branch yet