v6.14.0 (2016-08-23) TAKE ME TO FLAVOR TOWN

Lots of stuff in this release!

• #3624 A new preset for es2017: it includes the 2 previous stage-3 plugins: async/await (via transform-async-to-generator) and trailing commas in functions. (thanks to @bettiolo for the npm package)

npm install babel-preset-es2017 --save-dev

// .babelrc
{ "presets": ["es2017"] }

• #3625, #3673 A new preset called latest that transforms ES2015+ (currently ES2015, ES2016, ES2017). You can also pass options down to the es2015 preset.

We also will be working on getting a target/env (autoprefixer) preset soon.

npm install babel-preset-latest --save-dev

// .babelrc
{ "presets": ["latest"] }
// with options
{ "presets": [
  ["latest", {
    "es2015": {
      "modules": false 
    }
  }]
] }

• #3671 We also are including a spec option for the es2015 preset since the arrow function/template string plugins support this option.

spec for arrow functions adds a runtime check to make sure arrow functions are not instantiated (since they transform into normal functions).
spec for template literals wraps all expressions in String rather than simple string concatenation.

// .babelrc
{
  "presets": [
    ["es2015", { "spec": true }]
  ]
}

• #3659 @kittens added an optional wrapPluginVisitorMethod callback to transform to allow for performance tracking/introspection of plugins. More docs will be added on the website soon.
• #3658 sourcemaps will also now have a names field for identifiers to allow debuggers to do re-aliasing of mangled identifiers.
• #3518 For spec compilancy, we now will throw on a file with multiple export default.

Notable Bug Fixes

• #3527 Fix class inheritance in IE <=10 without loose mode.
• #3644 Support the ignore config option in .babelrc.
• #3655 Flow-only class props were not be stripped without transform-class-properties.

Guy Fieri

• babel-core
  • #3641 Fix exports of babel-core. (@thejameskyle)
  • #3646 Remove Guy Fieri from Babel's source code. (@jdan)

Commiters: 17

It's also a lot folk's first PR (or first code PR)!

• Adam Leventhal (ahl)
• Boopathi Rajaa (boopathi)
• Diogo Franco (Kovensky)
• Jordan Scales (jdan)
• Kai Cataldo (kaicataldo)
• Marcelo Jorge Vieira (marcelometal)
• Paul O’Shannessy (zpao)
• Sota Yamashtia (sotayamashita)
• Thomas Aylott (subtleGradient)

New Feature

• babel-preset-es2015
  • #3671 Support 'spec' option on babel-preset-es2015. (@Kovensky)
• babel-preset-latest
  • #3673 add options to babel-preset-latest. (@hzoo)
  • #3625 Create babel-preset-latest. (@sotayamashita)
• babel-preset-es2017
  • #3624 Add es2017-preset. (@sotayamashita)
• babel-core, babel-traverse
  • #3659 Add wrapPluginVisitorMethod option to allow introspection and metrics tracking of plugins. (@kittens)
• babel-cli, babel-core, babel-generator, babel-plugin-transform-regenerator, babel-template, babel-traverse
  • #3658 Generate names field for identifiers to get correct names mappings. (@kittens)
• babel-generator, babel-types
  • #3570 Add support for the new declare module.exports of flow. (@danez)

Spec Compliancy

• babel-plugin-transform-es2015-modules-amd, babel-plugin-transform-es2015-modules-commonjs, babel-plugin-transform-es2015-modules-umd
  • #3518 Throw error for multiple exports default. (@kaicataldo)

Bug Fix

• babel-core, babel-helper-replace-supers, babel-plugin-transform-class-properties, babel-plugin-transform-es2015-classes, babel-plugin-transform-es2015-function-name, babel-plugin-transform-es2015-object-super, babel-plugin-transform-es2015-parameters
  • #3527 Fix class inheritance in IE <=10 (T3041). (@danez)
• babel-cli
  • #3644 Fixes #6726 ignore config option. (@subtleGradient)
• babel-plugin-transform-es2015-modules-systemjs
  • #3650 System.register update expression consistency. (@guybedford)
• babel-generator
  • #3663 Use arrow syntax for ObjectTypeProperty FunctionTypeAnnotations. (@zpao)
• babel-register
  • #3608 Set sourceRoot in babel-register transform to fix paths in stacks. (@danez)
• babel-plugin-transform-es2015-block-scoping
  • #3618 incorrect handling of returns nested in switch cases. (@ahl)
• babel-traverse
  • #3559 Fix bug where redeclaration of var doesn't deopt. (@boopathi)
• babel-plugin-transform-flow-strip-types
  • #3655 Strip flow-only class props without needing transform-class-properties.. (@loganfsmyth)

Documentation

• Other
  • #3651 Fixed typo in README.md. (@marcelometal)

Internal

• babel-preset-es2015, babel-preset-latest
  • #3674 Latest tests. (@hzoo)
• babel-preset-es2015
  • #3672 Fixes modules test to actually test modules. (@Kovensky)
  • #3640 Update test name to reflect reality.. (@eventualbuddha)
• Other
  • #3668 Ensure correct version of babel installed for preset options. (@danez)
  • #3645 Add es2015 loose mode back. (@hzoo)
  • #3639 Use es2015 loose mode after publish. (@hzoo)