Add a custom jsonpFunction to prevent collisions with other splitChunks-using projects (#520)

Author: ryelle

webpack.config.js

@@ -52,7 +52,12 @@ const GutenbergBlocksConfig = {
 	output: {
 		path: path.resolve( __dirname, './build/' ),
 		filename: '[name].js',
+		library: [ 'wc', 'blocks', '[name]' ],
 		libraryTarget: 'this',
+		// This fixes an issue with multiple webpack projects using chunking
+		// overwriting each other's chunk loader function.
+		// See https://webpack.js.org/configuration/output/#outputjsonpfunction
+		jsonpFunction: 'webpackWcBlocksJsonp',
 	},
 	externals,
 	optimization: {