FE

[hyojun]

1. code splitting

Code splitting is required for faster initial loading of resources and selective cache busting.
Also, it would be good to separate theme libraries dependency from application code.

• https://webpack.github.io/docs/code-splitting.html#multiple-entry-chunks

2. caching / busting

To prevent round trip caused by cache expiration checking, one should make files be cached for a long time(~1yr?) and burst the cache by changing actual file names.

• https://webpack.github.io/docs/long-term-caching.html
  (https://medium.com/@okonetchnikov/long-term-caching-of-static-assets-with-webpack-1ecb139adb95)

3. merging

Having too many small chunks is bad for performance.

• https://github.com/webpack/docs/wiki/optimization#chunks