chore(deps): update dependency babel-loader to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
babel-loader	devDependencies	major	7.1.5 -> 8.0.4	source

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Release Notes

babel/babel-loader

v8.0.4

Compare Source

• #​692 - Quick fix for typo

v8.0.3

Compare Source

Features

• #​687 - Add customize option

Bugs

• #​685 - Also pass the caller option to loadPartialConfig

Docs

• #​681 - Update the README links to use the new options docs
• #​683 - Add .mjs to the examples

Internal

Some dev dependency updates and CI tweaks.

v8.0.2

Compare Source

• #​541 - A bunch of great README fixes
• #​574 - Add cacheCompression: false to disable GZip compression of the disk cache
• #​670 - Handle both 'sourceMap' and 'sourceMaps' options properly
• #​671 - Fix sourceMaps: 'inline' to work properly with babel-loader
• #​669 - Fix sourcemaps to work with Webpack's devtoolModuleFilenameTemplate placeholders

v8.0.1

Compare Source

• #​662 - docs: update README.md
• #​667 - docs: Remove babelrc from loader-specific options
• #​668 - Add a warning if you forget to install @babel/core or install babel-core.

v8.0.0

Compare Source

This is the first stable release of babel-loader for Babel 7.x.

• README updates
• Dropped peer dependency on betas and RCs, but left the backward-compat code we had for now to give people time to migrate

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[austingreendev]

@jzempel From the babel-loader docs it looks like v8.x of babel-loader isn't backwards compatible.

Will have to combine this with the babel 7.x upgrade which will require some time for the plugins/presets to catch-up.

[jzempel]

The comment here indicated the the major release was backwards compatible: https://github.com/babel/babel-loader/releases/tag/v8.0.0

[renovate]

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[coveralls]

Coverage remained the same at 94.751% when pulling 31489b0 on renovate/babel-loader-8.x into c11eb3f on master.

[austingreendev]

@jzempel @ryanseddon I've updated this PR to include all of the necessary changes to use the upgraded babel-loader and babel v7. Here is a quick overview.

.babelrc to babel.config.js

This move is recommended for monorepos in the babel7 upgrade guide.

The main difference in this config is the removal of the babel-preset-es2015 package. The preferred path forward is with @babel/env, which takes a custom browser target.

I chose to stick with the "default" value of > 0.5%, last 2 versions, Firefox ESR, not dead. This should be as close as possible to our original support set and covers the following browsers:

and_chr 70
and_ff 63
and_qq 1.2
and_uc 11.8
android 67
android 4.4.3-4.4.4
baidu 7.12
chrome 70
chrome 69
chrome 68
chrome 63
chrome 49
edge 18
edge 17
firefox 63
firefox 62
firefox 60
ie 11
ie_mob 11
ios_saf 12
ios_saf 11.3-11.4
ios_saf 11.0-11.2
op_mini all
op_mob 46
opera 56
opera 55
safari 12
safari 11.1
samsung 7.2
samsung 6.2
samsung 4

@babel/polyfill deprecation

With @babel/polyfill being deprecated, the docs suggest using core-js/shim. This works with our storybook polyfills in IE11 so we should be GTG.