Webpack Dev Server Refactor + Build Tools Updates

[sghoweri]

Jira

http://vjira2:8080/browse/BDS-678

Summary

Refactors and updates Bolt's build tools which include several important updates:

• Switches us over from using the now deprecated webpack-serve library to use the recommended webpack-dev-server library for continued support and updates
• Updates the build so Hot Module Reloading (HMR) JavaScript and CSS files compiled by Webpack now works exactly as expected
• Adds HMR support for HTML files while using Webpack Dev Server -- eliminating the need for our original Browsersync + Webpack proxy configuration
  • This also adds an internal cache so only HTML files with actual content changes cause the browser to reload
• Updates the Bolt build tools' CLI to log info about your local dev server setup -- similar to how Browsersync would output your local server IP + URL for easy access
• Adds new experimental cache support to the Bolt build tools via the Webpack Hard Source plugin @EvanLovely PR'd in speeding up WebPack builds by adding hard-source-webpack-plugin #914 but as an optional opt-in feature till some occasional bugs are ironed out.

Excitingly, this update can significantly help speed up local front-end dev builds after Webpack compiles for the very first time.

In testing this out locally, the 2nd time it took to boot up the Webpack Dev Server went from around 45 seconds initially (the first time booting up Webpack) and dropped down to < 5 seconds.. a 900% speed increase!

[bolt-bot]

⚡ PR built on Travis and deployed a now preview here:

• Branch link: https://feature-webpack-dev-server-refactor.boltdesignsystem.com
• Permalink: https://boltdesignsystem-shuagmcppd.now.sh

• Commit built: a94422c
• Travis build

[bolt-bot]

⚡ PR built on Travis and deployed a now preview here:

• Branch link: https://feature-webpack-dev-server-refactor.boltdesignsystem.com
• Permalink: https://boltdesignsystem-akwpbwszsf.now.sh

• Commit built: 4a5c785
• Travis build

[remydenton]

Looks great! Thanks for removing the zip files from the 2.1.2 release-- sorry about that. I also removed them in a2fa207.

Heads up to @mikemai2awesome that you can remove enableCache: true from apps/pattern-lab/.boltrc.js if you experience issues with caching.