core-js-builder

I highly recommend reading this: So, what's next?

For some cases could be useful to exclude some core-js features or generate a polyfill for target engines. This API helps conditionally include or exclude certain parts of core-js and build for targets. modules, exclude and targets options are specified in the core-js-compat format.

import builder from 'core-js-builder';

const bundle = await builder({
  // entry / module / namespace / an array of them, by default - all `core-js` modules
  modules: ['core-js/actual', /^esnext\.reflect\./],
  // a blacklist of entries / modules / namespaces, by default - empty list
  exclude: [/^es\.math\./, 'es.number.constructor'],
  // optional browserslist or core-js-compat format query
  targets: '> 0.5%, not dead, ie 9-11',
  // shows summary for the bundle, disabled by default
  summary: {
    // in the console, you could specify required parts or set `true` for enable all of them
    console: { size: true, modules: false },
    // in the comment in the target file, similarly to `summary.console`
    comment: { size: false, modules: true },
  },
  // output format, 'bundle' by default, can be 'cjs' or 'esm', and in this case
  // the result will not be bundled and will contain imports of required modules
  format: 'bundle',
  // optional target filename, if it's missed a file will not be created
  filename: PATH_TO_MY_COREJS_BUNDLE,
});

ℹ️ When using TypeScript, make sure to set esModuleInterop to true.

Changelog

3.38.0 - 2024.08.05

• Changes v3.37.1...v3.38.0
• RegExp.escape proposal:
  • Built-ins:
    • RegExp.escape
  • Moved to stage 3, June 2024 and July 2024 TC39 meetings
  • Updated the way of escaping, regex-escaping/77
  • Throw an error on non-strings, regex-escaping/58
  • Added /actual/ namespace entries, unconditional forced replacement changed to feature detection
• Promise.try proposal:
  • Built-ins:
    • Promise.try
  • Moved to stage 3, June 2024 TC39 meeting
  • Added /actual/ namespace entries, unconditional forced replacement changed to feature detection
• Uint8Array to / from base64 and hex stage 3 proposal:
  • Built-ins:
    • Uint8Array.fromBase64
    • Uint8Array.fromHex
    • Uint8Array.prototype.setFromBase64
    • Uint8Array.prototype.setFromHex
    • Uint8Array.prototype.toBase64
    • Uint8Array.prototype.toHex
  • Added Uint8Array.prototype.{ setFromBase64, setFromHex } methods
  • Added Uint8Array.fromBase64 and Uint8Array.prototype.setFromBase64 lastChunkHandling option, proposal-arraybuffer-base64/33
  • Added Uint8Array.prototype.toBase64 omitPadding option, proposal-arraybuffer-base64/60
  • Added throwing a TypeError on arrays backed by detached buffers
  • Unconditional forced replacement changed to feature detection
• Fixed RegExp named capture groups polyfill in combination with non-capturing groups, #1352, thanks @Ulop
• Improved some cases of environment detection
• Uses process.getBuiltinModule for getting built-in NodeJS modules where it's available
• Uses https instead of http in URL constructor feature detection to avoid extra notifications from some overly vigilant security scanners, #1345
• Some minor optimizations
• Updated browserslist in core-js-compat dependencies that fixes an upstream issue with incorrect interpretation of some browserslist queries, #1344, browserslist/829, browserslist/836
• Compat data improvements:
  • Added Safari 18.0 compat data:
    • Fixed Object.groupBy and Map.groupBy to work for non-objects
    • Fixed throwing a RangeError if Set methods are called on an object with negative size property
    • Fixed Set.prototype.symmetricDifference to call this.has in each iteration
    • Fixed Array.fromAsync to not call the Array constructor twice
    • Added URL.parse
  • Math.f16round and DataView.prototype.{ getFloat16, setFloat16 } marked as shipped from FF129
  • Symbol.asyncDispose added and marked as supported from V8 ~ Chromium 127
  • Promise.try added and marked as supported from V8 ~ Chromium 128
  • Added Deno 1.44 and 1.45 compat data mapping
  • self descriptor is broken in Deno 1.45.3 (again)
  • Added Electron 32 and 33 compat data mapping
  • Added Opera Android 83 compat data mapping
  • Added Samsung Internet 27 compat data mapping
  • Added Oculus Quest Browser 34 compat data mapping