Use webpack-config package directly

[oandregal]

• Testbed for Extract reusable part of Webpack config and put in @wordpress/scripts WordPress/gutenberg#13814
• See also Use webpack-config with wp-scritps #6

This uses webpack-config package directly. It requires that this plugin:

• Install necessary packages:
  • npm install --save-dev --save-exact <path-to-local-webpack-config-package>
  • npm install --save-dev --save-exact webpack webpack-cli
  • npm install --save-dev --save-exact babel-loader @babel/core source-map-loader
• Entry should be at src/index.js. Output will be at build/index.js

Note that current webpack-config setup doesn't support JSX.

[gziolo]

Entry should be at src/index.js. Output will be at dist/main.js

I added logic which changes the output to build/index.js to follow the pattern used inside Gutenberg.

[oandregal]

This is no longer necessary.