Babel7がリリースされるまでは更新されます。
注意: 量が多いので、BabelのInternal, Bug Fix, DocumentsとBabylonについては書きません。
また6.xへバックポートされたものも入っていますので注意してください。
もし、間違えや質問があれば、 @about_hiroppy までどうぞ;)
Index
Links
Milestone
Babel 7 Beta Milestone · GitHub
Wiki
Babel 7 · babel/babel Wiki · GitHub
Releases
Releases · babel/babel · GitHub
Revision History of This Article
2017/09/04(first)
Babelのstableがv6.26.0でプレリリースがv7.0.0-alpha.20です。
Babylonのv7.0.0-beta.22です。
The branches in babel have been moved. The previous
masteris now called6.x, and the7.0branch is nowmaster. Pull requests need to be based onmasterfrom now on. (2017/9/1)
masterブランチが7.0になったためここにまとめたいと思います。
Notable Changes
Babel
- TypeScriptのサポート
.babelrc.jsのサポート- spread-operatorが仕様準拠となる
- stageパッケージの追加と変動
Packages Status of Stage-X
従来通り、数値以上のパッケージはそこにすべて含まれます。
Tracking for Spec
stage-3
- babel-plugin-syntax-dynamic-import(new)
- babel-plugin-transform-async-generator-functions
- babel-plugin-transform-class-properties(new)
- babel-plugin-transform-object-rest-spread
- babel-plugin-transform-optional-catch-binding(new)
- babel-plugin-transform-unicode-property-regex(new)
stage-2
- babel-plugin-transform-export-namespace
- babel-plugin-transform-function-sent(new)
- babel-plugin-transform-numeric-separator(new)
- babel-preset-stage-3
stage-1
- babel-plugin-transform-decorators
- babel-plugin-transform-export-default
- babel-plugin-transform-optional-chaining(new)
- babel-preset-stage-2
stage-0
- babel-plugin-transform-do-expressions
- babel-plugin-transform-function-bind
- babel-preset-stage-1
Flow
babel-preset-env
polyfillを動的に入れてくれるようになる
Details of Changes
Babel
babel-preset-es2015
specモード時に変換されたアロー関数に名前が付与される
// input return { g: () => this } // output return { g: function g() { babelHelpers.newArrowCheck(this, _this); return this; }.bind(this) }
Related Plugins
babel-plugin-transform-es2015-arrow-functions
Versions
v7.0.0-alpha.10
PRs
check-es2015-constantsが仕様準拠となる
constでコンパイル時にエラーではなく、その前にthrowが追加されました。
Related Plugins
babel-plugin-check-es2015-constants
Versions
v7.0.0-alpha.17, 20
PRs
- Spec compliancy of check-es2015-constants plugin by maurobringolf · Pull Request #5930 · babel/babel · GitHub
- Consistent const violations by maurobringolf · Pull Request #6100 · babel/babel · GitHub
配列でのfor-ofの最適化
Related Plugins
babel-plugin-transform-es2015-for-of
Versions
v7.0.0-alpha.15
PRs
looseモードでのClassCallCheckとpossibleConstructorReturnが削除
Related Plugins
- babel-helpers
- babel-plugin-transform-es2015-classes
- babel-plugin-transform-flow-comments
- babel-plugin-transform-flow-strip-types
Versions
v7.0.0-alpha.15
PRs
looseモードにes2015-parametersが追加
argumentsを使用しません。
Related Plugins
babel-plugin-transform-es2015-parameters
Versions
v7.0.0-alpha.17
PRs
looseモードにclass-fieldsが追加
Object.definePropery を使わずに代入式でコンパイルされます。
var Bork = function Bork() { babelHelpers.classCallCheck(this, Bork); this.x = 'bar'; this.y = void 0; }; Bork.a = 'foo'; Bork.b = void 0;
Related Plugins
babel-plugin-transform-class-properties
Versions
v7.0.0-alpha.20
PRs
template-literalsはデフォルトでconcatを使用し、looseモードでは+を使用する
Related Plugins
babel-plugin-transform-es2015-template-literals
Versions
v7.0.0-alpha.20
PRs
spread-operatorが仕様準拠となる
// Invalid ( {...{}} = {} ); ( {...[]} = {} ); var { ...{ z } } = { z: 1 }; ({ x, ...{ y, z } } = o); // valid let {...{}} = {}; let {...[]} = {}; let { ...z } = { z: 1 }; ({ x, y, ...z } = o);
Related Plugins
- babel-plugin-transform-es2015-destructuring
- babel-plugin-transform-object-rest-spread
Versions
v7.0.0-alpha.20
PRs
babel-preset-stage-3
stage-3からstage-4のプラグインが削除
Versions
v7.0.0-alpha.1
PRs
dynamic-importの追加
for (const link of document.querySelectorAll('nav > a')) { link.addEventListener('click', e => { e.preventDefault(); import(`./section-modules/${link.dataset.entryModule}.js`) .then(module => module.loadPageInto(main)) .catch(err => main.textContent = err.message); }); }
Related Plugins
babel-plugin-syntax-dynamic-import
Versions
v7.0.0-alpha.8
PRs
Move syntax-dynamic-import to stage-3 by dkaoster · Pull Request #5610 · babel/babel · GitHub
Spec
GitHub - tc39/proposal-dynamic-import: import() proposal for JavaScript
optional-catch-bindingの追加
try {} catch {} try { bar; } catch { foo(); } finally { yay(); }
Related Plugins
babel-plugin-transform-optional-catch-binding
Versions
- v7.0.0-alpha.17
- v7.0.0-alpha.18
PRs
- Add optionality to catch bindings by MarckK · Pull Request #5956 · babel/babel · GitHub
- Add optional catch binding to stage 3 preset by existentialism · Pull Request #6032 · babel/babel · GitHub
Spec
class-fieldsの追加
class Bork { static a = 'foo'; static b; x = 'bar'; y; }
looseモードの指定がない場合、コンパイル時に代入式からObject.defineProperyを使うように変更されました。
Related Plugins
babel-plugin-transform-class-properties
Versions
v7.0.0-alpha.20
PRs
Spec
transform-unicode-property-regexの追加
const regexGreekSymbol = /\p{Script=Greek}/u; regexGreekSymbol.test('π'); // true
Related Plugins
babel-plugin-transform-unicode-property-regex
Versions
- v7.0.0-alpha.1
- v7.0.0-alpha.15
PRs
- babel-preset-stage-2: Add transform-unicode-property-regex by mathiasbynens · Pull Request #3683 · babel/babel · GitHub
- Move plugin-transform-unicode-property-regex to stage 3 by mathiasbynens · Pull Request #5877 · babel/babel · GitHub
Spec
babel-preset-stage-2
function.sentの追加
function* generator() { console.log('Sent', function.sent); console.log('Yield', yield); } const iterator = generator(); iterator.next(1); // Sent 1 iterator.next(2); // Yield 2
Related Plugins
- babel-helper-wrap-function
- babel-plugin-transform-function-sent
Versions
v7.0.0-alpha.17
PRs
Function sent by nicolo-ribaudo · Pull Request #5920 · babel/babel · GitHub
Spec
ESideas/Generator metaproperty.md at master · allenwb/ESideas · GitHub
export-default-fromの追加
export var v; export * as ns from 'mod'; export v, {x, y as w} from 'mod';
Related Plugins
- babel-plugin-transform-export-default
- babel-plugin-transform-export-namespace
Versions
v7.0.0-alpha.20
PRs
- Split the export-extensions plugin into two · Issue #6075 · babel/babel · GitHub
- Split export extensions into 2 by echo304 · Pull Request #6080 · babel/babel · GitHub
Spec
GitHub - tc39/proposal-export-default-from: Proposal to add `export v from "mod";` to ECMAScript.
numeric-separatorの追加
1_000_000_000 // Ah, so a billion 101_475_938.38 // And this is hundreds of millions let fee = 123_00; // $123 (12300 cents, apparently) let fee = 12_300; // $12,300 (woah, that fee!) let amount = 12345_00; // 12,345 (1234500 cents, apparently) let amount = 123_4500; // 123.45 (4-fixed financial) let amount = 1_234_500; // 1,234,500 let budget = 1_000_000_000_000; // What is the value of `budget`? It's 1 trillion! console.log(budget === 10 ** 12); // true
Related Plugins
babel-plugin-transform-numeric-separator
Versions
v7.0.0-alpha.20
PRs
Add numeric separator to stage 2 preset by rwaldron · Pull Request #6071 · babel/babel · GitHub
Spec
babel-preset-stage-1
optional-chaining-operatorの追加
const obj = { foo: { bar: { baz: 42, }, }, }; const baz = obj?.foo?.bar?.baz; // 42 const safe = obj?.qux?.baz; // undefined // Optional chaining and normal chaining can be intermixed obj?.foo.bar?.baz; // Only access `foo` if `obj` exists, and `baz` if `bar` exists
Related Plugins
babel-plugin-transform-optional-chaining
Versions
v7.0.0-alpha.15
PRs
Optional Chaining Operator (Stage 1) by jridgewell · Pull Request #5813 · babel/babel · GitHub
Spec
GitHub - tc39/proposal-optional-chaining
babel-plugin-transform-class-properties
configurableプロパティの追加
Object.defineProperty(REF, KEY, { configurable: true, enumerable: true, writable: true, value: VALUE });
Versions
v7.0.0-alpha.20
PRs
Add 'configurable' property to class fields by reznord · Pull Request #6123 · babel/babel · GitHub
babel-polyfill
それぞれの機能のポリフィルファイルを個別に追加
Versions
v7.0.0-alpha.7
PRs
add individual polyfill files by hzoo · Pull Request #5584 · babel/babel · GitHub
babel-cli
--inspect-brkオプションの追加
Node7.6で入ったオプションです。
Versions
v7.0.0-alpha.11
PRs
--config-fileオプションの追加
.babelrcのパスを渡すオプションです。
Versions
v7.0.0-alpha.20
PRs
babel-plugin-transform-runtime
useBuiltInsとuseESModulesオプションの追加
Versions
v7.0.0-alpha.3
PRs
babel-core
babelの環境変数が取得できるようになった
Versions
7.0.0-alpha.3
PRs
Export Babel's environment by xtuc · Pull Request #5448 · babel/babel · GitHub
babel-register
キャッシュディレクトリを見つけ、作成する
Versions
v7.0.0-alpha.10
PRs
Find cache dir by pwmckenna · Pull Request #5669 · babel/babel · GitHub
Flow
Object typeに対し、speadが使用可能に
type U = {}; type V = {}; type T = { ...U }; type T = { ...U, ...V, }; type T = { p: V, ...U, }; type T = { ...U, p: V, }; type T = { ...{} | { p: V } };
Versions
v7.0.0-alpha.10
PRs
Add support for object type spread by conartist6 · Pull Request #5525 · babel/babel · GitHub
declare exportが使用可能に
declare export var foo; declare export function foo(): void; declare export function foo<T>(): void; declare export function foo(x: number, y: string): void; declare export class A<T> extends B<T> { x: number } declare export class A { static foo(): number; static x : string } declare export class A mixins B<T>, C {} declare export default function foo(): void; declare export * from 'asd'; declare export { a, b }; declare export { c, d } from 'bar';
Versions
v7.0.0-alpha.15
PRs
Support declare export statements by danez · Pull Request #5589 · babel/babel · GitHub
predicatesのエイリアスサポート
declare function foo(x: mixed): boolean %checks(x !== null); function is_string(x): boolean %checks { return typeof x === "string"; }
Versions
v7.0.0-alpha.17
PRs
opaqueのエイリアスサポート
opaque type ID = string;
opaque type Foo<T> = Bar<T>;
opaque type Maybe<T> = _Maybe<T, *>;
export opaque type overloads =
& ((x: string) => number)
& ((x: number) => string)
;
Versions
v7.0.0-alpha.18
PRs
Flow opaque type aliases by jbrown215 · Pull Request #5990 · babel/babel · GitHub
babel-preset-reactはflowアノテーションがあるときのみflowの処理するように変更
TypeScriptとの互換性を持つためにbabel-preset-reactからflowのサポートはなくなります。
Versions
- v7.0.0-alpha.19
- v7.0.0-alpha.20
PRs
- Add requireDirective to strip-flow-types for use in React preset by existentialism · Pull Request #5468 · babel/babel · GitHub
- Remove Flow support in React preset by ramasilveyra · Pull Request #6118 · babel/babel · GitHub
その他使用者向け
Node 0.12のサポートが切られました
Versions
v7.0.0-alpha.1
PRs
Drop support for Node 0.12 :skull: by siddharthkp · Pull Request #5025 · babel/babel · GitHub
.babelrc.jsがサポートされました
Versions
v7.0.0-alpha.2
PRs
Add support for .babelrc.js files by kaicataldo · Pull Request #4892 · babel/babel · GitHub
.babelrc.jsで関数使用の許可・キャッシュ
Versions
v7.0.0-alpha.8
PRs
.babelignoreで否定パターンが使えるようになる
Versions
v7.0.0-alpha.8
PRs
babel-plugin-transform-new-targetの追加
Versions
v7.0.0-alpha.15
PR・Issue
- Class support should include `new.target` · Issue #1088 · babel/babel · GitHub
- Add new.target transform by jridgewell · Pull Request #5906 · babel/babel · GitHub
TypeScriptのサポート
{ "presets": ["typescript"] }
Related Plugins
- babel-plugin-syntax-typescript
- babel-plugin-transform-typescript
- babel-preset-typescript
Versions
- v7.0.0-alpha.18
- v7.0.0-alpha.19
- v7.0.0-alpha.20
PRs
- babel-generator: Add TypeScript support by andy-ms · Pull Request #5896 · babel/babel · GitHub
- Add babel-plugin-syntax-typescript, babel-plugin-transform-typescript, and babel-preset-typescript by andy-ms · Pull Request #5899 · babel/babel · GitHub
その他開発者向け
for-awaitは新しいASTに変更
// new forOfStatement t.forOfStatement(left, right, body, await) // @param {boolean} await - default: false
Versions
v7.0.0-alpha.1
PRs
Change for-await to use new AST by danez · Pull Request #5321 · babel/babel · GitHub
babel-traverseにString.rawの追加
Versions
v7.0.0-alpha.15
PRs
babel-standaloneがbabelレポへ移動
Versions
v7.0.0-alpha.20
PRs
Move babel-standalone into main Babel repo by Daniel15 · Pull Request #6029 · babel/babel · GitHub
babel-preset-env
useBuiltInsオプションの変更
以前はfalseでbooleanでしたが、"usage"か "entry"かfalseへ変更されました。
useBuiltInsというオプションはbabel-polyfillを入れるかどうかオプションです。
これにより、import 'babel-polyfill' が必要なくなります。
FYI: GitHub - babel/babel-preset-env at 2.0
Versions
v2.0.0-alpha.6
PRs
Website
REPLがreplaceされた
Babel · The compiler for writing next generation JavaScript
In Progress
Babel
decoratorsのアップデート
class Foo { @dec1 method1() {} @dec2(a, b, c) method2() {} @dec3outer @dec3inner method3() {} undecorated() {} }
elementDescriptor`というspecの概念の追加等
Versions
N/A
PRs
Decorators 2 Transform [WIP] by peey · Pull Request #6107 · babel/babel · GitHub
Spec
現在stage-2
Decorators
bigIntの追加
(1073741824n ** 2n).toString() === (new BigInt('1152921504606846976')).toString()
Versions
N/A
PRs
BigInt (Stage 2) [WIP] by wdhorton · Pull Request #6015 · babel/babel · GitHub
Spec
現在stage-3(PRの段階では2ですが現在3)
GitHub - tc39/proposal-bigint: Arbitrary precision integers in JavaScript
Babylon
Pattern Matchingの追加
let getLength = vector => match (vector) { { x, y, z }: Math.sqrt(x ** 2 + y ** 2 + z ** 2), { x, y }: Math.sqrt(x ** 2 + y ** 2), [...]: vector.length, else: { throw new Error("Unknown vector type"); } };
Versions
N/A
PRs
WIP Pattern Matching (Stage 0) by krzkaczor · Pull Request #635 · babel/babylon · GitHub
Spec
現在stage-0
GitHub - tc39/proposal-pattern-matching: Pattern matching syntax for ECMAScript
classへprivate methodsのサポート
class Counter extends HTMLElement { #xValue = 0; #clicked() { this.#x++; } constructor() { super(); this.onclick = this.#clicked.bind(this); } connectedCallback() { this.#render(); } #render() { this.textContent = this.#x.toString(); } }
Versions
N/A
PRs
Add support for class private methods by Qantas94Heavy · Pull Request #703 · babel/babylon · GitHub
Spec
現在stage-2
GitHub - tc39/proposal-private-methods: Private methods and getter/setters for ES6 classes
