Bump webpacker from 4.0.0.rc.2 to 6.0.0.pre.2

[dependabot-preview[bot]]

Bumps webpacker from 4.0.0.rc.2 to 6.0.0.pre.2.

Changelog

Sourced from webpacker's changelog.

Please note that Webpacker 3.1.0 and 3.1.1 have some serious bugs so please consider using either 3.0.2 or 3.2.0

Please note that Webpacker 4.1.0 has an installer bug. Please use 4.2.0 or above

[6.0.0] - 2020-TBD

• node_modules will no longer be compiled by default. This primarily fixes [rails issue #35501](rails/rails#35501) as well as numerous other webpacker issues. The disabled loader can still be required explicitly via:

const nodeModules = require('@rails/webpacker/rules/node_modules.js')
environment.loaders.append('nodeModules', nodeModules)

• If you have added environment.loaders.delete('nodeModules') to your environment.js, this must be removed or you will receive an error (Item nodeModules not found).
• The install task will now set the extract_css default to true in all environments and generate a separate application.css file for the default application pack, as supported by multiple files per entry introduced in 5.0.0. #2608
• Webpacker's wrapper to the splitChunks() API will now default runtimeChunk: 'single' which will help prevent potential issues when using multiple entry points per page #2708.
• Changes @babel/preset-env modules option to 'auto' per recommendation in the Babel docs #2709
• Adds experimental Yarn 2 support. Note you must manually set nodeLinker: node-modules in your .yarnrc.yml.

[5.2.1] - 2020-08-17

• Revert #1311.

[5.2.0] - 2020-08-16

• Bump dependencies and fixes. See diff for changes.

[5.1.1] - 2020-04-20

• Update TypeScript documentation and installer to use babel-loader for typescript.[(#2541](rails/webpacker#2541)

[5.1.0] - 2020-04-19

• Remove yarn integrity check #2518
• Switch from ts-loader to babel-loader #2449 Please see the TypeScript documentation to upgrade existing projects to use typescript with 5.1
• Resolve multi-word snakecase WEBPACKER_DEV_SERVER env values #2528

[5.0.1] - 2020-03-22

• Upgrade deps and fix sass loader config options bug #2508

[5.0.0] - 2020-03-22

• Bump minimum node version #2428
• Bump minimum ruby/rails version #2415
• Add support for multiple files per entry #2476

  entry: {
    home: ['./home.js', './home.scss'],
    account: ['./account.js', './account.scss']
</tr></table> ... (truncated)

Commits

• bb16e5a 6.0.0.pre.2
• 722a88d 6.0.0.pre.1
• 6ba995a Compatibility with Webpack 5 (#2802)
• 4210dd5 Add support for Yarn v2 (#2799)
• b6c2180 Bump ini from 1.3.5 to 1.3.7 (#2805)
• ce597a5 Update typescript.md (#2800)
• eaf3aa8 feat: Add --trace-deprecation flag (#2789)
• 743e6ae Fix minor typo in engines.md (#2781)
• 3760588 Fix for Webpacker not detecting up changes in engines (#2788)
• 2755166 Update babel & core-js (#2796)
• Additional commits viewable in compare view

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