#output.polyfill

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

Controls the polyfill injection mode.

See Polyfill Mode for more details.

#Install core-js

When you enable polyfill injection, make sure core-js v3 is installed in your project, which is a popular polyfill library for JavaScript.

npm add core-js

yarn add core-js

pnpm add core-js

bun add core-js

deno add npm:core-js

#Optional value

#usage

With output.polyfill set to 'usage', Rsbuild injects polyfills based on the APIs used in each file. This provides optimal bundle size by including only needed polyfills.

export default {
  output: {
    polyfill: 'usage',
  },
};

#entry

With output.polyfill set to 'entry', Rsbuild injects polyfills in each entry file. This ensures all polyfills are available but may increase bundle size.

export default {
  output: {
    polyfill: 'entry',
  },
};

#off

With output.polyfill set to 'off', Rsbuild doesn't inject polyfills. You need to handle code compatibility yourself.

export default {
  output: {
    polyfill: 'off',
  },
};

#Version history