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# Changelog
## v1.6.1 (2017-10-17)
### :bug: Bug Fix
- Update compat table to fix two small issues ([#445](https://github.com/babel/babel-preset-env/pull/445)) (@danez)
ES2015 destructuring is not fully supported in Edge 15 and the polyfill required again. `es6.math.imul` is supported on Android as of version 4.4
- Add polyfills for ES6 static Object methods ([#441](https://github.com/babel/babel-preset-env/pull/441)) (@danez)
Functions such as `Object.keys`, `Object.freeze`, ... do already exist in ES5, but their behaviour changed in ES2015. `babel-preset-env` with `builtIns: true` now adds the core-js polyfills for this methods if the browser only supports the ES5 variant of the method (like IE11 for example)
- Normalize module format of plugins/built-ins data ([#376](https://github.com/babel/babel-preset-env/pull/376)) (@rtsao)
## v1.6.0 (2017-07-04)
### :rocket: New Feature
- Bump compat-table for node8 support ([#363](https://github.com/babel/babel-preset-env/pull/363)) (@existentialism)
We updated our mappings to support native trailing function commas and string paddings in Node.js 8+.
### :bug: Bug Fix
- Handle `chromeandroid` browserslist value ([#367](https://github.com/babel/babel-preset-env/pull/367)) (@yavorsky)
We added support for using browserslist's `chromeandroid` in `targets`.
### :memo: Documentation
- Tweak uglify option docs ([#368](https://github.com/babel/babel-preset-env/pull/368)) (@existentialism)
Thanks to @graingert and @pfiaux for pointing out some needed updates to the `uglify-js`-related docs.
## v1.5.2 (2017-06-07)
### :bug: Bug Fix
- Ensure explicit targets always override browsers key targets ([#346](https://github.com/babel/babel-preset-env/pull/346)) (@existentialism)
`browser` targets should be overridden by explicit targets, and we inadvertently broke this when we landed string version support.
## v1.5.1 (2017-05-22)
### :bug: Bug Fix
- Compile with loose mode ([#322](https://github.com/babel/babel-preset-env/pull/332)) (@existentialism)
## v1.5.0 (2017-05-19)
### :rocket: New Feature
- Support target versions as strings ([#321](https://github.com/babel/babel-preset-env/pull/321)) (@existentialism)
We were originally waiting on 2.x for a breaking change, but since node v7.10
and other targets are causing some pain, we decided to land a backwards
compatible version.
### :house: Internal
- Backport: use preset-env and remove flow-strip-types ([#324](https://github.com/babel/babel-preset-env/pull/324)) (@yavorsky)
- Bump electron-to-chromium ([#329](https://github.com/babel/babel-preset-env/pull/329)) (@existentialism)
- Tweak version mappings to match compat-table updates ([#323](https://github.com/babel/babel-preset-env/pull/323)) (@existentialism)
- Bump browserslist ([#319](https://github.com/babel/babel-preset-env/pull/319)) (@existentialism)
- Bump compat-table ([#307](https://github.com/babel/babel-preset-env/pull/307)) (@existentialism)
- Add debug-fixtures and test/tmp to .eslintignore ([#305](https://github.com/babel/babel-preset-env/pull/305)) (@yavorsky)
## v1.4.0 (2017-04-14)
### :rocket: New Feature
- Support `spec` option ([#98](https://github.com/babel/babel-preset-env/pull/98)) (@Kovensky)
Added an option to enable more spec compliant, but potentially slower, transformations for any plugins in this preset that support them.
- Bump compat-table for Edge 15 support ([#273](https://github.com/babel/babel-preset-env/pull/273)) (@existentialism)
We updated our mappings so that you can get native support for async/await and other goodies when targeting Edge 15!
### :bug: Bug Fix
- Add Android browser to name map ([#270](https://github.com/babel/babel-preset-env/pull/270)) (@existentialism)
Fixed a bug that was ignoring Android targets in browserslist queries (for example: "Android >= 4").
### :memo: Documentation
- Clarify note about loading polyfills only once ([#282](https://github.com/babel/babel-preset-env/pull/282)) (@darahak)
- Add a reminder about include/exclude options ([#275](https://github.com/babel/babel-preset-env/pull/275)) (@existentialism)
### :house: Internal
- Chore: reduce package size. ([#281](https://github.com/babel/babel-preset-env/pull/281)) (@evilebottnawi)
- Remove deprecated comment ([#271](https://github.com/babel/babel-preset-env/pull/271)) (@yavorsky)
## v1.3.3 (2017-04-07)
### :bug: Bug Fix
- Support electron version in a string format ([#252](https://github.com/babel/babel-preset-env/pull/252)) (@yavorsky)
Adding electron as a target was an inadvertent breaking change as it no longer
allowed string versions. We added an exception for now, even though it is
inconsistent with other versions. Just as a note, the upcoming version 2.x will
allow _both_ number and string versions.
- Ensure const-check plugin order ([#257](https://github.com/babel/babel-preset-env/pull/257)) (@existentialism)
We now force the `const-es2015-check` plugin to run first (so that it can
correctly report issues before they get transpiled away).
### :rocket: New Feature
- Allow use `babel-plugin-` prefix for include and exclude ([#242](https://github.com/babel/babel-preset-env/pull/242)) (@yavorsky)
The `include` and `exclude` options now allow both prefixed (`babel-plugin-transform-es2015-spread`)
and prefix-less (`transform-es2015-spread`) plugin names.
### :memo: Documentation
- Note babel plugin prefix handling in include/exclude ([#245](https://github.com/babel/babel-preset-env/pull/245)) (@existentialism)
- Fix README: debug option shows info in stdout. ([#236](https://github.com/babel/babel-preset-env/pull/236)) (@Gerhut)
### :house: Internal
- Add simple smoke-test ([#240](https://github.com/babel/babel-preset-env/pull/240)) (@existentialism)
- Add prepublish script (@existentialism)
## v1.3.2 (2017-03-30)
- Fixed an issue with a broken publish
## v1.3.1 (2017-03-30)
- Fixed a regression with missing files due to `.npmignore`.
## v1.3.0 (2017-03-30)
### :bug: Bug Fix
- Add check for ArrayBuffer[Symbol.species] ([#233](https://github.com/babel/babel-preset-env/pull/233)) (@existentialism)
We now properly check for `Symbol.species` support in ArrayBuffer and include the
polyfill if necessary. This should, as a side effect, fix ArrayBuffer-related
errors on IE9.
### :nail_care: Polish
- Fill data with electron as a target. ([#229](https://github.com/babel/babel-preset-env/pull/229)) (@yavorsky)
We've simplified things by adding `electron` as a target instead of doing a bunch of
things at runtime. Electron targets should now also be displayed in the debug output.
- separate default builtins for platforms ([#226](https://github.com/babel/babel-preset-env/pull/226)) (@restrry)
If you are targeting the `node` environment exclusively, the always-included web polyfills
(like `dom.iterable`, and a few others) will now no longer be included.
### :memo: Documentation
* remove deprecated projects ([#223](https://github.com/babel/babel-preset-env/pull/223)) [skip ci] (@stevemao)
### :house: Internal
* npmignore: Add related to build data and codecov. ([#216](https://github.com/babel/babel-preset-env/pull/216)) (@yavorsky)
## v1.2.2 (2017-03-14)
### :bug: Bug Fix
- Refactor browser data parsing to handle families ([#208](https://github.com/babel/babel-preset-env/pull/208)) (@existentialism)
When parsing plugin data, we weren't properly handling browser families. This caused
`transform-es2015-block-scoping` and other plugins to be incorrectly added for Edge >= 12.
(s/o to @mgol for the the report and review!)
- Add typed array methods to built-ins features. ([#198](https://github.com/babel/babel-preset-env/pull/198)) (@yavorsky)
Fixes an issue where some TypedArray features were not being polyfilled properly. (s/o to @alippai for the report!)
### :memo: Documentation
- Fixed minor typo in readme ([#199](https://github.com/babel/babel-preset-env/pull/199)) (@bl4ckdu5t)
- Add built-ins, better links, compat-table url, etc ([#195](https://github.com/babel/babel-preset-env/pull/195)) (@yavorsky)
- Change CONTRIBUTING.md to use absolute paths ([#194](https://github.com/babel/babel-preset-env/pull/194)) (@aaronang)
### :house: Internal
- Bump plugins ([#201](https://github.com/babel/babel-preset-env/pull/201)) (@yavorsky)
- Enable code coverage ([#200](https://github.com/babel/babel-preset-env/pull/200)) (@alxpy)
- Increase mocha timeout to 10s ([#202](https://github.com/babel/babel-preset-env/pull/202)) (@yavorsky)
## v1.2.1 (2017-03-06)
### :bug: Bug Fix
- Add transform-duplicate-keys mapping ([#192](https://github.com/babel/babel-preset-env/pull/192)) (@existentialism)
Our plugin data was missing a mapping for the `transform-duplicate-keys` plugin which caused it to never be included. (s/o to @Timer for the report!)
### :memo: Documentation
- Clarify reasons for the uglify option in README.md ([#188](https://github.com/babel/babel-preset-env/pull/188)) (@mikegreiling)
## v1.2.0 (2017-03-03)
### :rocket: New Feature
- Add uglify as a target ([#178](https://github.com/babel/babel-preset-env/pull/178)) (@yavorsky)
Support for `uglify` as a target is now available! This will enable all plugins and, as a result, fully compiles your code to ES5. Note, that useBuiltIns will work as before, and only the polyfills that your other target(s) need will be included.
```json
{
"presets": [
["env", {
"targets": {
"chrome": 55,
"uglify": true
},
"useBuiltIns": true,
"modules": false
}]
]
}
```
### :bug: Bug Fix
- Respect older versions in invert equals map ([#180](https://github.com/babel/babel-preset-env/pull/180)) (@danez)
Fixes a number of bugs that caused some incorrect and/or missing environment data when parsing `compat-table`.
## v1.1.11 (2017-03-01)
This release primarily upgrades `compat-table`, which adds support for async on Node 7.6!
### :bug: Bug Fix
- Fix hasBeenWarned condition. ([#175](https://github.com/babel/babel-preset-env/pull/175)) (@yavorsky)
### :memo: Documentation
- Add yarn example. ([#174](https://github.com/babel/babel-preset-env/pull/174)) (@yavorsky)
### :house: Internal
- Bump compat-table ([#177](https://github.com/babel/babel-preset-env/pull/177)) (@existentialism)
- Add electron version exception test ([#176](https://github.com/babel/babel-preset-env/pull/176)) (@existentialism)
## v1.1.10 (2017-02-24)
### :bug: Bug Fix
- Drop use of lodash/intersection from checkDuplicateIncludeExcludes ([#173](https://github.com/babel/babel-preset-env/pull/173)) (@existentialism)
## v1.1.9 (2017-02-24)
### :bug: Bug Fix
- Add tests for debug output ([#156](https://github.com/babel/babel-preset-env/pull/156)) (@existentialism)
Since we've (mostly @yavorsky) have fixed a number of bugs recently with the `debug` option output, we added the ability to assert stdout matches what we expect. Read the updated [CONTRIBUTING.md](https://github.com/babel/babel-preset-env/blob/master/CONTRIBUTING.md#testing-the-debug-option) for more info.
- Fixes #143. Log correct targets. ([#155](https://github.com/babel/babel-preset-env/pull/155)) (@yavorsky)
This fixes a bug in the `debug` output where incorrect target(s) were being displayed for why a particular plugin/preset was being included.
Given targets:
```txt
{
"firefox": 52,
"node": 7.4
}
```
Before:
```txt
Using plugins:
transform-es2015-destructuring {"node":6.5}
transform-es2015-for-of {"node":6.5}
transform-es2015-function-name {"node":6.5}
transform-es2015-literals {"node":4}
transform-exponentiation-operator {"firefox":52}
syntax-trailing-function-commas {"firefox":52}
```
After:
```txt
Using plugins:
transform-es2015-destructuring {"firefox":52}
transform-es2015-for-of {"firefox":52}
transform-es2015-function-name {"firefox":52}
transform-es2015-literals {"firefox":52}
transform-exponentiation-operator {"node":7.4}
syntax-trailing-function-commas {"node":7.4}
```
### :memo: Documentation
- Fix compat-table link in contributing.md (@existentialism)
- Update README examples to fix website ([#151](https://github.com/babel/babel-preset-env/pull/)) (@existentialism)
- Fix few typos ([#146](https://github.com/babel/babel-preset-env/pull/146)) (@existentialism)
- Add configuration example to clarify `debug: true` ([#138](https://github.com/babel/babel-preset-env/pull/138)) (@yavorsky)
- Fix CHANGELOG’s v1.1.8 updates typo. ([#136](https://github.com/babel/babel-preset-env/pull/136)) (@yavorsky)
- README: Update `debug: true` example. ([#138](https://github.com/babel/babel-preset-env/pull/138)) (@yavorsky)
### :house: Internal
- update compat ([#169](https://github.com/babel/babel-preset-env/pull/169)) (@hzoo)
- Use external Electron to Chromium library ([#144](https://github.com/babel/babel-preset-env/pull/144)) (@Kilian)
- Update yarn lockfile ([#152](https://github.com/babel/babel-preset-env/pull/152)) (@existentialism)
- Extract option normalization into independant file ([#125](https://github.com/babel/babel-preset-env/pull/125)) (@baer)
- Update yarnfile ([#145](https://github.com/babel/babel-preset-env/pull/145)) (@baer)
- devDeps: eslint-config-babel v5.0.0 ([#139](https://github.com/babel/babel-preset-env/pull/139)) (@kaicataldo)
- Update compat-table, build data ([#135](https://github.com/babel/babel-preset-env/pull/135)) (@hzoo)
## v1.1.8 (2017-01-10)
### :bug: Bug Fix
- Debug: Transformations before logs. ([#128](https://github.com/babel/babel-preset-env/pull/128)) (@yavorsky)
Makes sure that all transformations on `targets` (such as `exclude`/`include`) are run before logging out with the `debug` option. Fixes ([#127](https://github.com/babel/babel-preset-env/issues/127)).
### :house: Internal
- Remove unnecessary extension. ([#131](https://github.com/babel/babel-preset-env/pull/131)) (@roman-yakobnyuk)
- Include yarn.lock and update CI. ([#124](https://github.com/babel/babel-preset-env/pull/124)) (@existentialism)
## v1.1.7 (2017-01-09)
Had a publishing issue in the previous release.
## v1.1.6 (2017-01-06)
### :bug: Bug Fix
- Explicitly resolve lowest browser version. ([#121](https://github.com/babel/babel-preset-env/pull/121)) (@brokenmass)
```js
{
"targets": {
"browsers": ["ios >= 6"] // was resolving to {ios: 10} rather than {ios: 6}
}
}
```
## v1.1.5 (2017-01-04)
### :bug: Bug Fix
- Show error if target version is not a number. ([#107](https://github.com/babel/babel-preset-env/pull/107)) (@existentialism)
```js
{
"presets": [
["env", {
"targets": {
"chrome": "52", // will error since it's not a number,
"chrome": 52 // correct!
}
}]
]
}
```
- Fix targets for the `debug` option. ([#109](https://github.com/babel/babel-preset-env/pull/109)) (@yavorsky)
Now it prints the transformed targets/environments rather than the browsers query.
```txt
Using targets:
{
"chrome": 53,
"ie": 10,
"node": 6
}
Modules transform: false
Using plugins:
transform-es2015-arrow-functions {"chrome":47,"node":6}
transform-es2015-block-scoped-functions {"chrome":41,"ie":11,"node":4}
Using polyfills:
es6.typed.uint8-clamped-array {"chrome":5,"node":0.12}
es6.map {"chrome":51,"node":6.5}
```
## v1.1.4 (2016-12-16)
v1.1.2-v1.1.4
### :bug: Bug Fix
The new `exclude`/`include` options weren't working correctly for built-ins. ([#102](https://github.com/babel/babel-preset-env/pull/102)).
Also fixes an issue with debug option.
## v1.1.1 (2016-12-13)
### :bug: Bug Fix
Regression with the previous release due to using `Object.values` (ES2017). This wasn't caught because we are using babel-register to run tests and includes polyfills so it didn't fail on CI even though we have Node 0.10 as an env. Looking into fixing this to prevent future issues.
## v1.1.0 (2016-12-13)
### :rocket: New Feature
- Add `exclude` option, rename `whitelist` to `include` ([#89](https://github.com/babel/babel-preset-env/pull/89)) (@hzoo)
Example:
```js
{
"presets": [
["env", {
"targets": {
"browsers": ["last 2 versions", "safari >= 7"]
},
"include": ["transform-es2015-arrow-functions"],
"exclude": [
"transform-regenerator",
"transform-async-to-generator",
"map"
],
"useBuiltIns": true
}]
]
}
```
`"exclude": ["transform-regenerator"]` doesn't transform generators and removes `regeneratorRuntime` from being imported.
`"exclude": ["transform-async-to-generator"]` doesn't use the built-in async-to-gen transform so you can use something like [fast-async](https://github.com/MatAtBread/fast-async).
`"exclude": ["map"]` doesn't include the `Map` polyfill if you know you aren't using it in your code (w/ `useBuiltIns`). (We will figure out a way to automatically do this [#84](https://github.com/babel/babel-preset-env/issues/84)).
If you pass a wrong plugin it will error: valid options for `include/exclude` are in [/data/plugin-features.js](https://github.com/babel/babel-preset-env/blob/master/data/plugin-features.js) and [/data/built-in-features.js](https://github.com/babel/babel-preset-env/blob/master/data/built-in-features.js) (without the `es6.`)
### :house: Internal
- Optimize result filtration. ([#77](https://github.com/babel/babel-preset-env/pull/77)) (@yavorsky)
- Update eslint config to align with other babel projects ([#79](https://github.com/babel/babel-preset-env/pull/79)) (@baer)
- Update pathnames to avoid uppercase ([#80](https://github.com/babel/babel-preset-env/pull/80)) (@baer)
- Refactor build data for clarity/consistency ([#81](https://github.com/babel/babel-preset-env/pull/81)) (@baer)
- Update linting rules to cover all js ([#82](https://github.com/babel/babel-preset-env/pull/82)) (@baer)
- Cleanup lib before rebuilding ([#87](https://github.com/babel/babel-preset-env/pull/87)) (@baer)
- Move linting dependency to be dev only ([#88](https://github.com/babel/babel-preset-env/pull/88)) (@baer)
### :memo: Documentation
- Fix typo ([#78](https://github.com/babel/babel-preset-env/pull/78)) (@rohmanhm)
- Fix PR link in changelog. ([#75](https://github.com/babel/babel-preset-env/pull/75)) (@nhajidin)
## v1.0.2 (2016-12-10)
### :bug: Bug Fix
* Fix issue with Object.getOwnPropertySymbols ([#71](https://github.com/babel/babel-preset-env/pull/71)) ([@existentialism](https://github.com/existentialism))
Was requiring the wrong module kinda of like in v1.0.1:
https://github.com/zloirock/core-js#ecmascript-6-symbol
```diff
-import "core-js/modules/es6.object.get-own-property-symbols";
```
The test is just a part of `Symbol`.
## v1.0.1 (2016-12-10)
### :bug: Bug Fix
* Fix regenerator import ([#68](https://github.com/babel/babel-preset-env/pull/68)) ([@hzoo](https://github.com/hzoo))
We were outputting an invalid path for `regenerator`!
```diff
+import "regenerator-runtime/runtime";
-import "core-js/modules/regenerator-runtime/runtime"-
```
## v1.0.0 (2016-12-09)
### :rocket: New Feature
* Add `useBuiltIns` option ([#56](https://github.com/babel/babel-preset-env/pull/56)) ([@hzoo](https://github.com/hzoo)), ([@yavorsky](https://github.com/yavorsky)), ([@existentialism](https://github.com/existentialism))
A way to apply `babel-preset-env` for polyfills (via `"babel-polyfill"``).
> This option will apply a new Babel plugin that replaces `require("babel-polyfill")` with the individual requires for `babel-polyfill` based on the target environments.
Install
```
npm install babel-polyfill --save
```
In
```js
import "babel-polyfill"; // create an entry js file that contains this
// or
import "core-js";
```
Out (different based on environment)
```js
// chrome 55
import "core-js/modules/es7.string.pad-start"; // haha left_pad
import "core-js/modules/es7.string.pad-end";
import "core-js/modules/web.timers";
import "core-js/modules/web.immediate";
import "core-js/modules/web.dom.iterable";
```
`.babelrc` Usage
```js
{
"presets": [
["env", {
"targets": {
"electron": 1.4
},
"modules": false, // webpack 2
"useBuiltIns": true // new option
}]
]
}
```
> Also looking to make an easier integration point via Webpack with this method. Please reach out if you have ideas!
---
* Support [Electron](http://electron.atom.io/) ([#55](https://github.com/babel/babel-preset-env/pull/55)) ([@paulcbetts](https://github.com/paulcbetts))
Electron is also an environment, so [Paul went ahead](https://twitter.com/paulcbetts/status/804507070103851008) and added support for this!
`.babelrc` Usage
```js
{
"presets": [ ["env", {"targets": { "electron": 1.4 }}]]
}
```
> Currently we are manually updating the data in [/data/electron-to-chromium.js](https://github.com/babel/babel-preset-env/blob/master/data/electron-to-chromium.js), but [@kevinsawicki](https://github.com/kevinsawicki) says we could generate the data from [atom-shell/dist/index.json](https://gh-contractor-zcbenz.s3.amazonaws.com/atom-shell/dist/index.json) as well! (Someone should make a PR :smile:)
## v0.0.9 (2016-11-24)
### :rocket: New Feature
* Support Opera ([#48](https://github.com/babel/babel-preset-env/pull/48)) (Henry Zhu)
Was as simple as modifying the chrome version and subtracting 13! (so chrome 54 = opera 41)
```js
{
"presets": [
["env", {
"targets": {
"opera": 41
}
}]
]
}
```
## v0.0.8 (2016-11-16)
### :nail_care: Polish
* Only print the debug info once ([#46](https://github.com/babel/babel-preset-env/pull/46) (Henry Zhu)
When using the `debug` option it was printing the data for each file processed rather than once.
```js
{
"presets": [
["env", {
"debug": true
}]
]
}
```
## v0.0.7 (2016-11-02)
### :rocket: New Feature
* hardcode a current node version option ([#35](https://github.com/babel/babel-preset-env/pull/35)) (Henry Zhu)
```js
{
"presets": [
["env", {
"targets": {
"node": "current" // parseFloat(process.versions.node)
}
}]
]
}
```
* add 'whitelist' option ([#31](https://github.com/babel/babel-preset-env/pull/31)) (Henry Zhu)
```js
{
"presets": [
["env", {
"targets": {
"chrome": 52
},
"whitelist": ["transform-es2015-arrow-functions"]
}]
]
}
```
* Add more aliases (Henry Zhu)
* Update plugin data: firefox 52 supports async/await! ([#29](https://github.com/babel/babel-preset-env/pull/29)) (Henry Zhu)
### :bug: Bug Fixes
* Use compat-table equals option ([#36](https://github.com/babel/babel-preset-env/pull/36)) (Henry Zhu)
Compute and use `compat-table` equivalents
```js
{
"safari6": "phantom",
"chrome44": "iojs",
"chrome50": "node64",
"chrome51": "node65",
"chrome54": "node7",
"chrome30": "android44",
"chrome37": "android50",
"chrome39": "android51",
"safari7": "ios7",
"safari71_8": "ios8",
"safari9": "ios9",
"safari10": "ios10",
"chrome50": "node6"
}
```
* Change default behavior to act the same as babel-preset-latest ([#33](https://github.com/babel/babel-preset-env/pull/33)) (Henry Zhu)
```js
{ "presets": ["env"] } // should act the same as babel-preset-latest
```
## Internal
* Add fixture helper for tests ([#28](https://github.com/babel/babel-preset-env/pull/28)) (Henry Zhu)
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