v0.1.0

Breaking

• Now uses esbuild instead of rollup for bundling: 7015697, f60251d
  This only affects the config.build function hook, if you had been using it.

• Now requires Node 12.10+ runtime: 7e6d20d, b895c12
  Previously was only a Node 10.x requirement

• Only ship cfw as an ESM file: ed0a4b7, 09c49ab
  Because Node 12.10+ is now required, there's no need to ship a CommonJS runtime (or both)

Features

• Support cfw.cjs and cfw.mjs config files: 62f93f4
• Add TypeScript definition file for Config interface: b6999a8
• Throw build error if config.build() produces invalid configuration: 37a839a

Chores

• (build) Update "build errors" message: 08c9945
• (utils) use Set for worker argv filters: b68a41f
• (utils) Merge exists & assert helpers: 402c8f4
• Bump typescript version: d0e4ae7
• Inject $$VERSION$$ at build time: 7945050
• Convert bin.js to TypeScript main entry: bf06dec
• Replace premove with fs.rmdir native: b895c12