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output.polyfill

  • Type: 'entry' | 'usage' | 'ua' | 'off'
  • Default: 'entry'

Via output.polyfill you can configure how the polyfill is injected.

Config

entry

Polyfill is injected in every entry file when output.polyfill is configured as 'entry'.

Equivalent to useBuiltIns: 'entry' configuration in @babel/preset-env.

usage

Polyfill is injected in each file based on the API used in the code.

Equivalent to useBuiltIns: 'usage' configuration in @babel/preset-env.

ua

The Polyfill code is dynamically delivered according to the currently requested UA information.

The dynamic delivery feature needs to be used with the upper-level framework. For more details, please refer to Modern.js - Polyfill At Runtime.

off

Polyfill is not injected. When using this option, you need to ensure code compatibility yourself.