Feature (build-*): Local development server. Closes #10043.

[christianztamayo]

Helps improve productivity with live reload via webpack-dev-server.
Useful for developing plugins, doing customizations, etc.
Starts the server by running yarn start inside a build package's directory.

Affects ckeditor5-build-* packages:

• ckeditor5-build-balloon
• ckeditor5-build-balloon-block
• ckeditor5-build-classic
• ckeditor5-build-decoupled-document
• ckeditor5-build-inline

Closes #10043

---

Additional information

Re-opening outdated PRs from the now archived build-classic, as well as the added documentation on ckeditor/ckeditor5.

Implementation: ckeditor/ckeditor5-build-classic#94
Documentation: #6064

ckeditor/ckeditor5-build-classic#94 (comment) has been addressed on this PR as well.

[adamerose]

To get this working on webpack 5 I think you'd need to change this

devServer: {
	compress: true,
	contentBase: [
		path.resolve( __dirname, 'sample' ),
		path.resolve( __dirname, 'tests' )
	],
	open: true,
	publicPath: '/assets/',
	watchContentBase: true
},

to this

devServer: {
	static: [
		{
			directory: path.join(__dirname, 'sample'),
			watch: true,
			publicPath: '/assets',
			serveIndex: true,
		},
		{
			directory: path.join(__dirname, 'tests'),
			watch: true,
			publicPath: '/assets',
			serveIndex: true,
		},
	],
	compress: true,
	open: true,
},

[itwondersteam]

why this PR is closed? live reload is helpful for plugin development.

Update:
Well, it seems that the previous MR is not for webpack 5 :/

[adamerose]

For anyone arriving here from Google I think the best route now is use the new package generator which comes with hot reload