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Editing: CHANGELOG.md

### Version 4.0.0 (2018-01-28) ###

- Added: Support for ES2018. The only change needed was recognizing the `s`
  regex flag.
- Changed: _All_ tokens returned by the `matchToToken` function now have a
  `closed` property. It is set to `undefined` for the tokens where “closed”
  doesn’t make sense. This means that all tokens objects have the same shape,
  which might improve performance.

These are the breaking changes:

- `'/a/s'.match(jsTokens)` no longer returns `['/', 'a', '/', 's']`, but
  `['/a/s']`. (There are of course other variations of this.)
- Code that rely on some token objects not having the `closed` property could
  now behave differently.

### Version 3.0.2 (2017-06-28) ###

- No code changes. Just updates to the readme.

### Version 3.0.1 (2017-01-30) ###

- Fixed: ES2015 unicode escapes with more than 6 hex digits are now matched
  correctly.

### Version 3.0.0 (2017-01-11) ###

This release contains one breaking change, that should [improve performance in
V8][v8-perf]:

> So how can you, as a JavaScript developer, ensure that your RegExps are fast?
> If you are not interested in hooking into RegExp internals, make sure that
> neither the RegExp instance, nor its prototype is modified in order to get the
> best performance:
>
> ```js
> var re = /./g;
> re.exec('');  // Fast path.
> re.new_property = 'slow';
> ```

This module used to export a single regex, with `.matchToToken` bolted
on, just like in the above example. This release changes the exports of
the module to avoid this issue.

Before:

```js
import jsTokens from "js-tokens"
// or:
var jsTokens = require("js-tokens")
var matchToToken = jsTokens.matchToToken
```

After:

```js
import jsTokens, {matchToToken} from "js-tokens"
// or:
var jsTokens = require("js-tokens").default
var matchToToken = require("js-tokens").matchToToken
```

[v8-perf]: http://v8project.blogspot.se/2017/01/speeding-up-v8-regular-expressions.html

### Version 2.0.0 (2016-06-19) ###

- Added: Support for ES2016. In other words, support for the `**` exponentiation
  operator.

These are the breaking changes:

- `'**'.match(jsTokens)` no longer returns `['*', '*']`, but `['**']`.
- `'**='.match(jsTokens)` no longer returns `['*', '*=']`, but `['**=']`.

### Version 1.0.3 (2016-03-27) ###

- Improved: Made the regex ever so slightly smaller.
- Updated: The readme.

### Version 1.0.2 (2015-10-18) ###

- Improved: Limited npm package contents for a smaller download. Thanks to
  @zertosh!

### Version 1.0.1 (2015-06-20) ###

- Fixed: Declared an undeclared variable.

### Version 1.0.0 (2015-02-26) ###

- Changed: Merged the 'operator' and 'punctuation' types into 'punctuator'. That
  type is now equivalent to the Punctuator token in the ECMAScript
  specification. (Backwards-incompatible change.)
- Fixed: A `-` followed by a number is now correctly matched as a punctuator
  followed by a number. It used to be matched as just a number, but there is no
  such thing as negative number literals. (Possibly backwards-incompatible
  change.)

### Version 0.4.1 (2015-02-21) ###

- Added: Support for the regex `u` flag.

### Version 0.4.0 (2015-02-21) ###

- Improved: `jsTokens.matchToToken` performance.
- Added: Support for octal and binary number literals.
- Added: Support for template strings.

### Version 0.3.1 (2015-01-06) ###

- Fixed: Support for unicode spaces. They used to be allowed in names (which is
  very confusing), and some unicode newlines were wrongly allowed in strings and
  regexes.

### Version 0.3.0 (2014-12-19) ###

- Changed: The `jsTokens.names` array has been replaced with the
  `jsTokens.matchToToken` function. The capturing groups of `jsTokens` are no
  longer part of the public API; instead use said function. See this [gist] for
  an example. (Backwards-incompatible change.)
- Changed: The empty string is now considered an “invalid” token, instead an
  “empty” token (its own group). (Backwards-incompatible change.)
- Removed: component support. (Backwards-incompatible change.)

[gist]: https://gist.github.com/lydell/be49dbf80c382c473004

### Version 0.2.0 (2014-06-19) ###

- Changed: Match ES6 function arrows (`=>`) as an operator, instead of its own
  category (“functionArrow”), for simplicity. (Backwards-incompatible change.)
- Added: ES6 splats (`...`) are now matched as an operator (instead of three
  punctuations). (Backwards-incompatible change.)

### Version 0.1.0 (2014-03-08) ###

- Initial release.

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