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core-js@3 #325

Merged
merged 281 commits into from
Jun 7, 2018
Merged

core-js@3 #325

merged 281 commits into from
Jun 7, 2018

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zloirock
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@zloirock zloirock commented Aug 9, 2017 •
edited

Features:

  • Add new features:
  • Improve existing features:
    • Add triggering unhandled Promise rejection events (instead of only global handlers), #205.
    • Add support of @@isConcatSpreadable to Array#concat.
    • Add support of @@species to Array#{concat, filter, map, slice, splice}.
    • Correct iterators prototypes chain, related #261.
    • Correct Typed Arrays prototypes chain, related #378.
    • Make the internal state of polyfilled features completely unobservable, #146.
    • Add validation of receiver's internal class to missed non-generic methods.
    • Fix descriptors of global properties.
    • In the version without global pollution, if Object#toString does not support @@toStringTag, add to wrapped prototypes own toString method with @@toStringTag logic, see #199.
  • Update standard features and proposals:
  • Mark ES2016, ES2017 and ES2018 features as stable:
    • Array#includes and %TypedArray%#includes
    • Object.values and Object.entries
    • Object.getOwnPropertyDescriptors
    • String#padStart and String#padEnd
    • Promise#finally
    • Symbol.asyncIterator
    • Object#__(define|lookup)[GS]etter__
  • Remove obsolete features:
    • Error.isError (withdrawn)
    • System.global (replaced by global)
    • Map#toJSON and Set#toJSON (rejected)
    • RegExp.escape (rejected)
    • Reflect.enumerate (removed from the spec)
    • Unnecessary iteration methods from CSSRuleList, MediaList, StyleSheetList
  • No more non-standard features, finally removed:
    • Dict
    • Object.{classof, isObject, define, make}
    • Function#part
    • Number#@@iterator
    • String#{escapeHTML, unescapeHTML}
    • delay
  • Add .sham flag to features which can't be properly polyfilled and / or not recommended for usage:
    • Symbol constructor - we can't add new primitives. Object.prototype accessors too expensive.
    • Object.{create, defineProperty, defineProperties, getOwnPropertyDescriptor, getOwnPropertyDescriptos}, Reflect.{defineProperty, getOwnPropertyDescriptor} can't be properly polyfilled without descriptors support.
    • Object.{freeze, seal, preventExtensions}, Reflect.preventExtensions can't be properly polyfilled in ES3 environment.
    • Object.getPrototypeOf can be deceived in ES3 environment.
    • Reflect.construct can't be polyfilled for a correct work with newTarget argument on built-ins.
    • Typed Array constructors polyfill is quite correct but too expensive.

Bug and compatibility fixes:

  • Fix deoptimisation of iterators in V8, #377.
  • Fix import of property before constructor which should contain this property, #262.
  • Fix some cases of IE11 WeakMap frozen keys fallback, #384.
  • Fix non-enumerable integer keys issue because of Nashorn ~ JDK8 bug, #389.

Repository:

  • Change core-js repository structure to monorepo with packages in /packages/ directory.
  • Clean-up it, remove all possible duplicates, generated files, etc.

Packages:

  • Extract a version without global namespace pollution to a separate core-js-pure package (replacement for core-js/library).
  • Leave only one pair of bundles (global, with all polyfills) and move it to core-js-bundle package.
  • Remove bundling logic from core-js package, leave it only in core-js-builder package.
  • Clean-up packages.
  • Because of all approaches, reduce size of packages from ~2mb for core-js@2 to:
    • ~400kb for core-js package
    • ~340kb for core-js-pure package
  • Finally remove bower.json

CommonJS API, namespaces:

  • Move core-js/library to separate core-js-pure package.
  • Because of removing all non-standard features, we no longer need core-js/shim entry point, replace it just with core-js.
  • Move all features from ES5, ES2015, ES2016, ES2017 and ES2018 to one namespace for stable ES - it's available as core-js/es, all those features in modules folder has es. prefix.
  • Change prefix for ES proposals from es7. to esnext., they no longer available in core-js/es7, use core-js/stage/* instead of that.
  • Rename core-js(/library)/fn to core-js(-pure)/features for improve readability.
  • Add /proposals/ entry points for allow include all features from one proposal (for example, core-js/proposals/reflect-metadata).
  • Allow more granular inclusion of features from /es/ path (for example, core-js/es/array/from).
  • Split typed arrays polyfills. Now you can, for example, load only required method (for example, core-js/es/typed-array/from).
  • Extract well-known symbols definition from es.symbol module for loading only required features, for example, in MS Edge.
  • Rename web.dom namespace to web.dom-collections.
  • Rename es6.regexp.{match, replace, search, split} -> es.string.{match, replace, search, split} - mainly it's fixes / adding support of well-known symbols to string methods, only in second place adding related methods to regexp prototype.
  • Relax /modules/ directory by moving internal modules to /internals/ directory.
  • core object no longer available in the global version, entry points which previously returned it now returns global object. Also, don't set global.core object.
  • Add some missing entry points.

Tools, tests, code quality:

  • Refactor source code for improving readability.
  • Get rid of LiveScript, usage another language in JS standard library looks strange and impedes usage of tools like ESLint:
    • Rewrite tests to JS.
    • Rewrite scripts to JS.
  • Use for tests Babel with minimalistic config which should work anywhere.
  • Use ESLint on the code of tests and tools.
  • Remove an option for generation bundle of a version without global namespace pollution from core-js-builder - now it's an odd use case.
  • Remove UMD wrapper from the code, generated by core-js-builder bundles - we don't need it for a global polyfill.

Documentation:

  • Document API changes
  • For each feature
    • Rewrite signatures of features to something like Web IDL / TypeScript / Flow
    • Add description
    • Add link to MDN
    • Add link to compat table
    • Add info about fixed bugs of engines
  • Add CONTRIBUTING.md
  • Add some babel-related info to Usage section (can be postponed):
    • About @babel/polyfill
    • About @babel/runtime
    • About @babel/preset-env
  • Add a note about compatibility with some popular tools

Also:

  • Add PRs to babel@7 (after publishing a pre-release of core-js@3):
    • Update @babel/polyfill
    • Update @babel/runtime
    • Update @babel/preset-env

The list is not completely finished.

@zloirock zloirock mentioned this pull request Aug 17, 2017
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aciccarello
aciccarello reviewed Aug 24, 2017
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modules/es7.system.global.js
// https://github.com/tc39/proposal-global
var $export = require('./_export');

$export($export.S, 'System', { global: require('./_global') });
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You might want to hold off on removing System.global until tc39/proposal-global#20 is cleared up.

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@aciccarello maybe. I'm watching this issue, but global is already on stage 3.

@zloirock zloirock mentioned this pull request Aug 25, 2017
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@zloirock
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core-js@3.0.0-beta.2 is available.

@zloirock zloirock mentioned this pull request Jun 7, 2018
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zloirock
zloirock commented Jun 7, 2018
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packages/core-js/modules/esnext.promise.all-settled.js
if (result.e) reject(result.v);
return capability.promise;
}
});
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cc @jasonwilliams @mathiasbynens internal logic is similar to Promise.all. Any comments?

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@zloirock looks good to me, i don't see any issues there.

@zloirock
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zloirock commented Jun 7, 2018

core-js@3.0.0-beta.3 is available.

@AlexWayfer
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AlexWayfer commented Jun 7, 2018 •
edited

Undeniably, great work! Any plans about release date?… I'm not pushing, just for personal planning.

@zloirock
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zloirock commented Jun 7, 2018

@AlexWayfer all that I wanna see in core-js@3 already here. Left some minor internal changes, RC, work on documentation and a release article. I can't say the concrete date.

@AlexWayfer
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Yep, okay. Thank you. I'll wait!

@zloirock
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zloirock commented Jun 7, 2018

I think that it's time to merge it with master.

@zloirock zloirock merged commit 2fe6644 into master Jun 7, 2018
@tverskih tverskih mentioned this pull request Aug 26, 2019
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Does Angular 6 supports core-js 3.x versions

@zloirock
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zloirock commented Aug 1, 2023

@Gokulanarayanan you could ask the Angular team - I'm not an expert in Angular versions.

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