# Changelog
> **Tags:**
> - [Breaking Change]
> - [Spec Compliancy]
> - [New Feature]
> - [Bug Fix]
> - [Documentation]
> - [Internal]
> - [Polish]
_Note: Gaps between patch versions are faulty, broken or test releases._
See the [Babel Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md) for the pre-6.8.0 version changelog.
## 6.9.0 (2016-08-16)
### New syntax support
- Add JSX spread children ([#42](https://github.com/babel/babylon/pull/42)) @calebmer
(Be aware that React is not going to support this syntax)
```js
{...todos.map(todo => )}
```
- Add support for declare module.exports ([#72](https://github.com/babel/babylon/pull/72)) @danez
```js
declare module "foo" {
declare module.exports: {}
}
```
### New Features
- If supplied, attach filename property to comment node loc. ([#80](https://github.com/babel/babylon/pull/80)) @divmain
- Add identifier name to node loc field ([#90](https://github.com/babel/babylon/pull/90)) @kittens
### Bug Fixes
- Fix exponential operator to behave according to spec ([#75](https://github.com/babel/babylon/pull/75)) @danez
- Fix lookahead to not add comments to arrays which are not cloned ([#76](https://github.com/babel/babylon/pull/76)) @danez
- Fix accidental fall-through in Flow type parsing. ([#82](https://github.com/babel/babylon/pull/82)) @xiemaisi
- Only allow declares inside declare module ([#73](https://github.com/babel/babylon/pull/73)) @danez
- Small fix for parsing type parameter declarations ([#83](https://github.com/babel/babylon/pull/83)) @gabelevi
- Fix arrow param locations with flow types ([#57](https://github.com/babel/babylon/pull/57)) @danez
- Fixes SyntaxError position with flow optional type ([#65](https://github.com/babel/babylon/pull/65)) @danez
### Internal
- Add codecoverage to tests @danez
- Fix tests to not save expected output if we expect the test to fail @danez
- Make a shallow clone of babel for testing @danez
- chore(package): update cross-env to version 2.0.0 ([#77](https://github.com/babel/babylon/pull/77)) @greenkeeperio-bot
- chore(package): update ava to version 0.16.0 ([#86](https://github.com/babel/babylon/pull/86)) @greenkeeperio-bot
- chore(package): update babel-plugin-istanbul to version 2.0.0 ([#89](https://github.com/babel/babylon/pull/89)) @greenkeeperio-bot
- chore(package): update nyc to version 8.0.0 ([#88](https://github.com/babel/babylon/pull/88)) @greenkeeperio-bot
## 6.8.4 (2016-07-06)
### Bug Fixes
- Fix the location of params, when flow and default value used ([#68](https://github.com/babel/babylon/pull/68)) @danez
## 6.8.3 (2016-07-02)
### Bug Fixes
- Fix performance regression introduced in 6.8.2 with conditionals ([#63](https://github.com/babel/babylon/pull/63)) @danez
## 6.8.2 (2016-06-24)
### Bug Fixes
- Fix parse error with yielding jsx elements in generators `function* it() { yield ; }` ([#31](https://github.com/babel/babylon/pull/31)) @eldereal
- When cloning nodes do not clone its comments ([#24](https://github.com/babel/babylon/pull/24)) @danez
- Fix parse errors when using arrow functions with an spread element and return type `(...props): void => {}` ([#10](https://github.com/babel/babylon/pull/10)) @danez
- Fix leading comments added from previous node ([#23](https://github.com/babel/babylon/pull/23)) @danez
- Fix parse errors with flow's optional arguments `(arg?) => {}` ([#19](https://github.com/babel/babylon/pull/19)) @danez
- Support negative numeric type literals @kittens
- Remove line terminator restriction after await keyword @kittens
- Remove grouped type arrow restriction as it seems flow no longer has it @kittens
- Fix parse error with generic methods that have the name `get` or `set` `class foo { get() {} }` ([#55](https://github.com/babel/babylon/pull/55)) @vkurchatkin
- Fix parse error with arrow functions that have flow type parameter declarations `(x: T): T => x;` ([#54](https://github.com/babel/babylon/pull/54)) @gabelevi
### Documentation
- Document AST differences from ESTree ([#41](https://github.com/babel/babylon/pull/41)) @nene
- Move ast spec from babel/babel ([#46](https://github.com/babel/babylon/pull/46)) @hzoo
### Internal
- Enable skipped tests ([#16](https://github.com/babel/babylon/pull/16)) @danez
- Add script to test latest version of babylon with babel ([#21](https://github.com/babel/babylon/pull/21)) @danez
- Upgrade test runner ava @kittens
- Add missing generate-identifier-regex script @kittens
- Rename parser context types @kittens
- Add node v6 to travis testing @hzoo
- Update to Unicode v9 ([#45](https://github.com/babel/babylon/pull/45)) @mathiasbynens
## 6.8.1 (2016-06-06)
### New Feature
- Parse type parameter declarations with defaults like `type Foo = T`
### Bug Fixes
- Type parameter declarations need 1 or more type parameters.
- The existential type `*` is not a valid type parameter.
- The existential type `*` is a primary type
### Spec Compliancy
- The param list for type parameter declarations now consists of `TypeParameter` nodes
- New `TypeParameter` AST Node (replaces using the `Identifier` node before)
```
interface TypeParameter <: Node {
bound: TypeAnnotation;
default: TypeAnnotation;
name: string;
variance: "plus" | "minus";
}
```
## 6.8.0 (2016-05-02)
#### New Feature
##### Parse Method Parameter Decorators ([#12](https://github.com/babel/babylon/pull/12))
> [Method Parameter Decorators](https://goo.gl/8MmCMG) is now a TC39 [stage 0 proposal](https://github.com/tc39/ecma262/blob/master/stage0.md).
Examples:
```js
class Foo {
constructor(@foo() x, @bar({ a: 123 }) @baz() y) {}
}
export default function func(@foo() x, @bar({ a: 123 }) @baz() y) {}
var obj = {
method(@foo() x, @bar({ a: 123 }) @baz() y) {}
};
```
##### Parse for-await statements (w/ `asyncGenerators` plugin) ([#17](https://github.com/babel/babylon/pull/17))
There is also a new node type, `ForAwaitStatement`.
> [Async generators and for-await](https://github.com/tc39/proposal-async-iteration) are now a [stage 2 proposal](https://github.com/tc39/ecma262#current-proposals).
Example:
```js
async function f() {
for await (let x of y);
}
```