core-js-builder
Advanced tools
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.
Symbol.disposeSymbol.asyncDisposeSuppressedErrorDisposableStack
DisposableStack.prototype.disposeDisposableStack.prototype.useDisposableStack.prototype.adoptDisposableStack.prototype.deferDisposableStack.prototype.moveDisposableStack.prototype[@@dispose]AsyncDisposableStack
AsyncDisposableStack.prototype.disposeAsyncAsyncDisposableStack.prototype.useAsyncDisposableStack.prototype.adoptAsyncDisposableStack.prototype.deferAsyncDisposableStack.prototype.moveAsyncDisposableStack.prototype[@@asyncDispose]Iterator.prototype[@@dispose]AsyncIterator.prototype[@@asyncDispose]es. namespace module, /es/ and /stable/ namespaces entriesArray.fromAsync proposal:
Array.fromAsynces. namespace module, /es/ and /stable/ namespaces entriesError.isError proposal:
Error.isErrores. namespace module, /es/ and /stable/ namespaces entriesIterator.zipIterator.zipKeyedIterator chunking stage 2 proposal:
Iterator.prototype.chunksIterator.prototype.windowsNumber.prototype.clamp proposal:
Number.prototype.clampMath.clamp was replaced with Number.prototype.clampRangeError if min <= max or +0 min and -0 max, tc39/proposal-math-clamp/#22flags getter PR. Native methods are not fixed, only own implementation updated for:
RegExp.prototype[@@match]RegExp.prototype[@@replace]RegExp flags in polyfills of some methods in engines without proper support of RegExp.prototype.flags and without polyfill of this getterthis is updated while Set.prototype.difference is being executedthis in the following methods:
Set.prototype.symmetricDifferenceSet.prototype.unionIterator.prototype.dropIterator.prototype.filterIterator.prototype.flatMapIterator.prototype.mapIterator.from when underlying iterator's return method is nullArray.prototype.with when index coercion failsTypedArray.prototype.with should truncate negative fractional index to zero, but instead throws an errorPromise polyfill in the pure version/iterator/flat-map entriesError.isError marked not supported in Node because of a bugSet.prototype.difference marked as not supported in Safari and supported only from Bun 1.2.5 because of a bugSet.prototype.{ symmetricDifference, union } marked as not supported in Safari and supported only from Bun 1.2.5 because of a bugIterator.from marked as not supported in Safari and supported only from Bun 1.2.5 because of a bugIterator helpers marked as implemented from FF141Array.prototype.with marked as supported only from FF140 because it throws an incorrect exception when index coercion failsTypedArray.prototype.with marked as unsupported in Bun and Safari because it should truncate negative fractional index to zero, but instead throws an errorDisposableStack and AsyncDisposableStack marked as shipped in FF141 (SuppressedError has a bug)AsyncDisposableStack bugs marked as fixed in Deno 2.3.2SuppressedError bugs (extra arguments support and arity) marked as fixed in Bun 1.2.15FAQs
core-js builder
The npm package core-js-builder receives a total of 8,930 weekly downloads. As such, core-js-builder popularity was classified as popular.
We found that core-js-builder demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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