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Faster Webpack builds

Warren Gifford requested to merge faster-webpack into master

Created by: sqs

This PR significantly speeds up Webpack initial and incremental builds of TypeScript and SCSS:

  • 25% faster initial build time (31s -> 23s)
  • 74% faster TypeScript incremental builds (3.7s -> 1.0s)
  • 47% faster SCSS incremental builds (5.5s -> 2.9s)

See commit messages for a discussion of each change.

Benchmarks:

  • Initial build: goreman run restart web and look for Time: ...
  • TypeScript incremental build: echo '/* a */' >> web/src/SourcegraphWebApp.tsx and look for Time: ...
  • SCSS incremental build: echo '/* a */' >> web/src/SourcegraphWebApp.scss and look for Time: ...

(All on the same computer, with nothing else running.)

master branch:

  • Initial build: 31067ms
  • TypeScript incremental build: 3684ms
  • SCSS incremental build: 5519ms

faster-webpack branch:

  • Initial build: 23310ms (-25%)
  • TypeScript incremental build: 966ms (-74%)
  • SCSS incremental build: 2938ms (-47%)

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