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# Change Log
This project adheres to [Semantic Versioning](http://semver.org/).
## 4.6.6
* Remove Safari from `dead` query.
## 4.6.5
* Add Samsung 4 browser to `dead` query.
* Remove dirty fix for `android all` error.
## 4.6.4
* Add Firefox 68 to `Firefox ESR` query.
## 4.6.3
* Dirty fix for `android all` error.
## 4.6.2
* Fix `last x version` and similar queries for Android (by Tony Ross).
## 4.6.1
* Fix patch version support for Electron (by Kilian Valkhof).
## 4.6
* Add `mobileToDesktop` option (by Nicolò Ribaudo).
## 4.5.6
* Make `Node > 5` and `node > 5` queries case insensitive.
## 4.5.5
* Fix CLI help (by Marcel Gerber).
* Add KaiOS browser to docs.
## 4.5.4
* Update docs (by Andrew Leedham and Dan Onoshko).
## 4.5.3
* Fix splitting string to queries.
## 4.5.2
* Show default browsers in CLI on project without config.
## 4.5.1
* Improve text for the warning about outdated `caniuse-lite`.
## 4.5
* Add `>=`, `>`, and `<=` support for Node.js version (by Mathspy Terabithian).
## 4.4.2
* Allow to have string in `package.json` (by @dmarkhas).
## 4.4.1
* Allow to use `.` in scope name of shareable config (by Gustav Nikolaj).
## 4.4
* Added `and` and `or` keywords to combine queries (by Jon Ege Ronnenberg).
## 4.3.7
* Fix fraction years support in `last 1.5 years` (by Clément P).
* Fix version-less browser support.
## 4.3.6
* Fix version-less browser support in custom statistics (by Alex Walter).
## 4.3.5
* Fix `not` query for wrong Can I Use data.
## 4.3.4
* Allow to update `node-releases` without new Browserslist releases.
## 4.3.3
* Fix Node.js 11 support.
## 4.3.2
* Fix `Unknown version 11 of Node.js` error (by Dan Onoshko).
## 4.3.1
* Fix conflict between `caniuse-lite` and custom browsers statistics.
## 4.3
* Allow to use `extends browserslist-config-a/file` (by @Schweinepriester).
## 4.2.1
* Use new `node-releases` support (by Sergey Rubanov).
## 4.2
* Add `--json` argument for CLI.
* Allow to pass multiple areas in CLI by `--coverage=US,alt-AS,global`.
## 4.1.2
* Better `unknow query` error message.
* Use latest `node-releases`.
## 4.1.1
* Update Firefox ESR versions.
## 4.1
* Add `current node` query.
* Add contributors widget to docs (by Sergey Surkov).
## 4.0.2
* Fix new `node-releases` support (by Sergey Rubanov).
* Fix error text (by Josh Smith).
## 4.0.1
* Reduce npm package size.
* Fix docs.
## 4.0.0 “Erinaceus amurensis”
* Add `node X` and `maintained node versions` queries (by Pavel Vostrikov).
* Remove Node.js 4 support.
* Show warning if `caniuse-lite` is old (by Anton Tuzhik).
* Add comma support in config file.
## 3.2.8
* Add IE 9-5.5 to dead browsers.
* Remove development configs from npm package.
## 3.2.7
* Add Firefox 60 as Firefox ESR.
## 3.2.6
* Add Opera Mini 12 to dead browsers.
* Update docs (by Jamie Kyle).
## 3.2.5
* Fix excluding Opera Mini and other browsers with `all` version.
## 3.2.4
* Resolve shareable config from current working directory.
## 3.2.3
* Fix `package.json` config validation for single string case.
* Fix CLI error reporting.
## 3.2.2
* Add `package.json` config validation.
* Move project to `browserlist` GitHub organization.
## 3.2.1
* Fix error text (by Steve Schrab).
## 3.2
* Add `cover 99%` query (by Vasily Fedoseyev).
* Add `cover 99% in US` query (by Vasily Fedoseyev).
* Add `cover 99% in my stats` query (by Vasily Fedoseyev).
* Add `"my stats"` support to `browserlist.coverage()` (by Vasily Fedoseyev).
## 3.1.2
* Add more clear error on missed browser version.
## 3.1.1
* Fix JSDoc (by Sylvain Pollet-Villard).
## 3.1
* Add `ignoreUnknownVersions` option.
* Fix docs (by Pascal Duez).
## 3.0 “Atelerix sclateri”
* Remove country statistics from client-side build of Browserslist.
* Change `> 1%` to `> 0.5%` in default query.
* Add `not dead` to default query.
* Change default environment to `production` (by Marco Fugaro).
* Add `dead` query support with IE 10 and BlackBerry browser.
* Add multiple environments in one section support (by Evilebot Tnawi).
* Add custom statistics support to `browserlist.coverage()`.
* Fix `path` option check.
## 2.11.3
* Fix for `path: undefined` option.
## 2.11.2
* Remove Node.js specific code from webpack build.
## 2.11.1
* Fix using Browserslist in browser with `path` but without `fs`.
## 2.11
* Add `last 2 years` query support (by James Harris).
## 2.10.2
* Fix Browserify support.
## 2.10.1
* Fix using Browserslist without `process` (by Andrew Patton).
## 2.10
* Add `< 1%` and `<= 1%` queries support (by August Kaiser).
## 2.9.1
* Fix unknown query on trailing spaces in query.
## 2.9
* Add `last Electron versions` and `last Electron major versions` queries
(by Louis Mouhat).
## 2.8
* Add `since 2016-03` and `since 2016-03-20` queries support (by Andrew Blick).
## 2.7
* Add `since 2016` queries support (by Igor Deryabin).
## 2.6.1
* Fix `Path must be a string` error.
## 2.6
* By default load config from current directory in CLI tool.
## 2.5.1
* Allow `@scope/browserlist-config` config name (by Jamie Connolly).
## 2.5
* Add `extends` query (by YellowKirby).
## 2.4.1
* Throw error if `package.json` contain `browserlist` instead of `browserslist`.
## 2.4
* Add `last n major versions` query (by John Sanders).
## 2.3.3
* Fix browsers support.
## 2.3.2
* Fix `> 0` query for browsers with one version (by Nikolay Solovyov).
## 2.3.1
* Reduce library size.
## 2.3
* Add `unreleased versions` and `unreleased Chrome versions` queries.
## 2.2.2
* Fix `Path must be a string` error (by Pieter Beulque).
## 2.2.1
* Fix security issue with regions dynamic `require`.
## 2.2
* Add region usage statistics support (by Clément P).
## 2.1.5
* Remove Firefox 45 from Firefox ESR.
## 2.1.4
* Use both ESR versions when they actual.
## 2.1.3
* Add warning on first exclude query.
## 2.1.2
* Fix non-Node.js environments support.
## 2.1.1
* Fix CLI arguments parsing.
## 2.1
* Add `>= 5%`, `>= 5% in US` and `>= 5% in my stats` queries.
## 2.0 “Atelerix frontalis”
* `last n versions` returns versions for all browsers, not only main browsers.
* Cache file system operations (by Aarni Koskela).
* Use `caniuse-lite` 1 MB instead of `caniuse-db` 7 MB (by Ben Briggs).
* Add `.browserslistrc` config support.
* Add QQ Browser for Android support.
* Add tests for CLI (by Zhulduz Zhankenova).
## 1.7.7
* Update Firefox ESR.
## 1.7.6
* Fix Android Chrome selection.
## 1.7.5
* Fix combining `not` query with country based statistics.
* Fix `--env` argument in CLI (by Tuure Savuoja).
## 1.7.4
* Speed up browser sorting (by Aarni Koskela).
## 1.7.3
* Fix config finding when directory was passed to `path` (by Aarni Koskela).
## 1.7.2
* Fix config finding algorithm (by Aarni Koskela).
## 1.7.1
* Fix unreleased browsers version detection.
## 1.7
* Add `--config` and `--env` arguments to CLI (by Jarek Rencz).
## 1.6
* Convert Electron version to Chrome (by Kilian Valkhof).
* Fix `0` version mistake in Can I Use data.
## 1.5.2
* Fix browser versions ordering (by Marco Massarotto).
## 1.5.1
* Fix error on `package.json` and `browserslist` in same directory.
## 1.5
* Add `package.json` support (by Stepan Kuzmin).
* Add environments support (by Maksim Semenov and openlibser).
* Add `browserslist-stats.json` file support (by Oleh Aloshkin).
* Add `config` option to CLI (by Evilebot Tnawi).
* Add JSDoc.
* Fix tests on Windows (by Anna Stoliar).
* Don’t set custom usage statistics globally.
## 1.4
* Add `defaults` keyword.
## 1.3.6
* Add `UCAndroid` alias to `and_uc` (by Evilebot Tnawi).
## 1.3.5
* Fix Opera Mini support. Use `op_mini all`.
## 1.3.4
* Add space-less `>1%` and `>.5%` syntax support (by Andreas Lind).
## 1.3.3
* Clean `0` versions in some country-based requests.
## 1.3.2
* Update Firefox ESR.
## 1.3.1
* Add Safari TP support.
## 1.3
* Add coverage for specific country (by Joshua Wise).
## 1.2
* Add `browserslist.coverage()` method.
* Add `--coverage` and `-c` argument to CLI.
* Add `-v` argument support to CLI.
* Better error handling in CLI.
## 1.1.3
* Fix jspm support (by Sean Anderson).
## 1.1.2
* Fix jspm support (by Sean Anderson).
## 1.1.1
* Fix space-less `>10%` and `>10% in my stats` queries.
* Normalize error messages.
* Remove development files from npm package.
## 1.1
* Added query against custom browser usage data (by Daniel Rey).
## 1.0.1
* Update Firefox ESR (by Rouven Weßling).
## 1.0 “Atelerix algirus”
* Remove Opera 12.1 from default query.
* Add `not` keyword and exclude browsers by query.
* Add Microsoft Edge support (by Andrey Polischuk).
* Add CLI for debug and non-JS usage (by Luke Horvat).
* Use own class in Browserslist errors.
## 0.5
* Add version ranges `IE 6-9` (by Ben Briggs).
## 0.4
* Add `config` option and `BROWSERSLIST_CONFIG` environment variable support.
* Add symlink config support.
## 0.3.3
* Fix DynJS compatibility (by Nick Howes).
## 0.3.2
* Fix joined versions on versions query (by Vincent De Oliveira).
## 0.3.1
* Fix global variable leak (by Peter Müller).
## 0.3
* Takes queries from `BROWSERSLIST` environment variable.
## 0.2
* Return Can I Use joined versions as `ios_saf 7.0-7.1`.
## 0.1.3
* Better work with Can I Use joined versions like `ios_saf 7.0-7.1`.
* Browserslist now understands `ios_saf 7.0` or `ios_saf 7`.
## 0.1.2
* Do not create global `browserslist` var (by Maxime Thirouin).
## 0.1.1
* Sort browsers by name and version.
## 0.1 “Atelerix albiventris”
* Initial release.

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The MIT License (MIT)
Copyright 2014 Andrey Sitnik <andrey@sitnik.ru>
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# Browserslist [![Cult Of Martians][cult-img]][cult]
<img width="120" height="120" alt="Browserslist logo by Anton Lovchikov"
src="https://browserslist.github.io/browserslist/logo.svg" align="right">
The config to share target browsers and Node.js versions between different
front-end tools. It is used in:
* [Autoprefixer]
* [Babel]
* [postcss-preset-env]
* [eslint-plugin-compat]
* [stylelint-no-unsupported-browser-features]
* [postcss-normalize]
* [obsolete-webpack-plugin]
All tools will find target browsers automatically,
when you add the following to `package.json`:
```js
"browserslist": [
"last 1 version",
"> 1%",
"maintained node versions",
"not dead"
]
```
Or in `.browserslistrc` config:
```yaml
# Browsers that we support
last 1 version
> 1%
maintained node versions
not dead
```
Developers set versions list in queries like `last 2 version`
to be free from updating versions manually.
Browserslist will use [Can I Use] data for this queries.
Browserslist will take queries from tool option,
`browserslist` config, `.browserslistrc` config,
`browserslist` section in `package.json` or environment variables.
You can test Browserslist queries in [online demo].
[Browserslist Example] shows how every tool uses Browserslist.
[cult-img]: https://cultofmartians.com/assets/badges/badge.svg
[cult]: https://cultofmartians.com/done.html
<a href="https://evilmartians.com/?utm_source=browserslist">
<img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg"
alt="Sponsored by Evil Martians" width="236" height="54">
</a>
[stylelint-no-unsupported-browser-features]: https://github.com/ismay/stylelint-no-unsupported-browser-features
[eslint-plugin-compat]: https://github.com/amilajack/eslint-plugin-compat
[Browserslist Example]: https://github.com/browserslist/browserslist-example
[postcss-preset-env]: https://github.com/jonathantneal/postcss-preset-env
[postcss-normalize]: https://github.com/jonathantneal/postcss-normalize
[Autoprefixer]: https://github.com/postcss/autoprefixer
[online demo]: https://browserl.ist/
[Can I Use]: https://caniuse.com/
[Babel]: https://github.com/babel/babel/tree/master/packages/babel-preset-env
[obsolete-webpack-plugin]: https://github.com/ElemeFE/obsolete-webpack-plugin
## Table of Contents
1. [Tools](#tools)
2. [Best Practices](#best-practices)
3. [Queries](#queries)
4. [Config File](#config-file)
5. [Configuring for Different Environments](#configuring-for-different-environments)
6. [Custom Usage Data](#custom-usage-data)
7. [JS API](#js-api)
8. [Environment Variables](#environment-variables)
9. [Cache](#cache)
## Tools
* [`browserslist-ga`] downloads your website browsers statistics
to use it in `> 0.5% in my stats` query.
* [`browserslist-useragent-regexp`] compiles Browserslist query to a RegExp
to test browser useragent.
* [`browserslist-useragent-ruby`] is a Ruby library to checks browser
by user agent string to match Browserslist.
* [`browserslist-browserstack`] runs BrowserStack tests for all browsers
in Browserslist config.
* [`caniuse-api`] returns browsers which support some specific feature.
* Run `npx browserslist` in your project directory to see project’s
target browsers. This CLI tool is built-in and available in any project
with Autoprefixer.
[`browserslist-useragent-ruby`]: https://github.com/browserslist/browserslist-useragent-ruby
[`browserslist-useragent`]: https://github.com/pastelsky/browserslist-useragent
[`browserslist-useragent-regexp`]: https://github.com/browserslist/browserslist-useragent-regexp
[`browserslist-ga`]: https://github.com/browserslist/browserslist-ga
[`caniuse-api`]: https://github.com/Nyalab/caniuse-api
[`browserslist-browserstack`]: https://github.com/xeroxinteractive/browserslist-browserstack
## Best Practices
* Select browsers directly (`last 2 Chrome versions`) only if you are making
a web app for a kiosk with one browser. There are a lot of browsers
on the market. If you are making general web app you should respect
browsers diversity.
* There is a `defaults` query, which gives a reasonable configuration
for most users:
```json
"browserslist": [
"defaults"
]
```
* If you want to change the default set of browsers we recommend to combine
`last 1 version`, `not dead` with `> 0.2%` (or `> 1% in US`,
`> 1% in my stats`). `last n versions` adds too many dead browsers
and does not add popular old versions. Choosing a percentage above `0.2%`
will in the long run make popular browsers even more popular. We might run
into a monopoly and stagnation situation, as we had with Internet Explorer 6.
Please use this setting with caution.
* Don’t remove browsers just because you don’t know them. Opera Mini has
100 million users in Africa and it is more popular in the global market
than Microsoft Edge. Chinese QQ Browsers has more market share than Firefox
and desktop Safari combined.
## Queries
Browserslist will use browsers and Node.js versions query
from one of this sources:
1. `browserslist` key in `package.json` file in current or parent directories.
**We recommend this way.**
2. `.browserslistrc` config file in current or parent directories.
3. `browserslist` config file in current or parent directories.
4. `BROWSERSLIST` environment variable.
5. If the above methods did not produce a valid result
Browserslist will use defaults:
`> 0.5%, last 2 versions, Firefox ESR, not dead`.
### Query Composition
An `or` combiner can use the keyword `or` as well as `,`.
`last 1 version or > 1%` is equal to `last 1 version, > 1%`.
`and` query combinations are also supported to perform an
intersection of the previous query: `last 1 version and > 1%`.
There is 3 different ways to combine queries as depicted below. First you start
with a single query and then we combine the queries to get our final list.
Obviously you can *not* start with a `not` combiner, since there is no left-hand
side query to combine it with.
| Query combiner type | Illustration | Example |
| ------------------- | :----------: | ------- |
|`or`/`,` combiner <br> (union) | ![Union of queries](img/union.svg) | `> .5% or last 2 versions` <br> `> .5%, last 2 versions` |
| `and` combiner <br> (intersection) | ![intersection of queries](img/intersection.svg) | `> .5% and last 2 versions` |
| `not` combiner <br> (relative complement) | ![Relative complement of queries](img/complement.svg) | `> .5% and not last 2 versions` <br> `> .5% or not last 2 versions` <br> `> .5%, not last 2 versions` |
_A quick way to test your query is to do `npx browserslist '> 0.5%, not IE 11'`
in your terminal._
### Full List
You can specify the browser and Node.js versions by queries (case insensitive):
* `> 5%`: browsers versions selected by global usage statistics.
`>=`, `<` and `<=` work too.
* `> 5% in US`: uses USA usage statistics. It accepts [two-letter country code].
* `> 5% in alt-AS`: uses Asia region usage statistics. List of all region codes
can be found at [`caniuse-lite/data/regions`].
* `> 5% in my stats`: uses [custom usage data].
* `cover 99.5%`: most popular browsers that provide coverage.
* `cover 99.5% in US`: same as above, with [two-letter country code].
* `cover 99.5% in my stats`: uses [custom usage data].
* `maintained node versions`: all Node.js versions, which are [still maintained]
by Node.js Foundation.
* `node 10` and `node 10.4`: selects latest Node.js `10.x.x`
or `10.4.x` release.
* `current node`: Node.js version used by Browserslist right now.
* `extends browserslist-config-mycompany`: take queries from
`browserslist-config-mycompany` npm package.
* `ie 6-8`: selects an inclusive range of versions.
* `Firefox > 20`: versions of Firefox newer than 20.
`>=`, `<` and `<=` work too. It also works with Node.js.
* `iOS 7`: the iOS browser version 7 directly.
* `Firefox ESR`: the latest [Firefox ESR] version.
* `unreleased versions` or `unreleased Chrome versions`:
alpha and beta versions.
* `last 2 major versions` or `last 2 iOS major versions`:
all minor/patch releases of last 2 major versions.
* `since 2015` or `last 2 years`: all versions released since year 2015
(also `since 2015-03` and `since 2015-03-10`).
* `dead`: browsers without official support or updates for 24 months.
Right now it is `IE 10`, `IE_Mob 10`, `BlackBerry 10`, `BlackBerry 7`,
`Samsung 4` and `OperaMobile 12.1`.
* `last 2 versions`: the last 2 versions for *each* browser.
* `last 2 Chrome versions`: the last 2 versions of Chrome browser.
* `defaults`: Browserslist’s default browsers
(`> 0.5%, last 2 versions, Firefox ESR, not dead`).
* `not ie <= 8`: exclude browsers selected by previous queries.
You can add `not ` to any query.
[`caniuse-lite/data/regions`]: https://github.com/ben-eb/caniuse-lite/tree/master/data/regions
[two-letter country code]: https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Officially_assigned_code_elements
[custom usage data]: #custom-usage-data
[still maintained]: https://github.com/nodejs/Release
[Can I Use]: https://caniuse.com/
### Debug
Run `npx browserslist` in project directory to see what browsers was selected
by your queries.
```sh
$ npx browserslist
and_chr 61
and_ff 56
and_qq 1.2
and_uc 11.4
android 56
baidu 7.12
bb 10
chrome 62
edge 16
firefox 56
ios_saf 11
opera 48
safari 11
samsung 5
```
### Browsers
Names are case insensitive:
* `Android` for Android WebView.
* `Baidu` for Baidu Browser.
* `BlackBerry` or `bb` for Blackberry browser.
* `Chrome` for Google Chrome.
* `ChromeAndroid` or `and_chr` for Chrome for Android
* `Edge` for Microsoft Edge.
* `Electron` for Electron framework. It will be converted to Chrome version.
* `Explorer` or `ie` for Internet Explorer.
* `ExplorerMobile` or `ie_mob` for Internet Explorer Mobile.
* `Firefox` or `ff` for Mozilla Firefox.
* `FirefoxAndroid` or `and_ff` for Firefox for Android.
* `iOS` or `ios_saf` for iOS Safari.
* `Node` for Node.js.
* `Opera` for Opera.
* `OperaMini` or `op_mini` for Opera Mini.
* `OperaMobile` or `op_mob` for Opera Mobile.
* `QQAndroid` or `and_qq` for QQ Browser for Android.
* `Safari` for desktop Safari.
* `Samsung` for Samsung Internet.
* `UCAndroid` or `and_uc` for UC Browser for Android.
* `kaios` for KaiOS Browser.
## Config File
### `package.json`
If you want to reduce config files in project root, you can specify
browsers in `package.json` with `browserslist` key:
```json
{
"private": true,
"dependencies": {
"autoprefixer": "^6.5.4"
},
"browserslist": [
"last 1 version",
"> 1%",
"IE 10"
]
}
```
### `.browserslistrc`
Separated Browserslist config should be named `.browserslistrc`
and have browsers queries split by a new line. Comments starts with `#` symbol:
```yaml
# Browsers that we support
last 1 version
> 1%
IE 10 # sorry
```
Browserslist will check config in every directory in `path`.
So, if tool process `app/styles/main.css`, you can put config to root,
`app/` or `app/styles`.
You can specify direct path in `BROWSERSLIST_CONFIG` environment variables.
## Shareable Configs
You can use the following query to reference an exported Browserslist config
from another package:
```json
"browserslist": [
"extends browserslist-config-mycompany"
]
```
For security reasons, external configuration only supports packages that have
the `browserslist-config-` prefix. npm scoped packages are also supported, by
naming or prefixing the module with `@scope/browserslist-config`, such as
`@scope/browserslist-config` or `@scope/browserslist-config-mycompany`.
If you don’t accept Browserslist queries from users, you can disable the
validation by using the `dangerousExtend` option:
```js
browserslist(queries, { path, dangerousExtend: true })
```
Because this uses `npm`'s resolution, you can also reference specific files
in a package:
```json
"browserslist": [
"extends browserslist-config-mycompany/desktop",
"extends browserslist-config-mycompany/mobile"
]
```
When writing a shared Browserslist package, just export an array.
`browserslist-config-mycompany/index.js`:
```js
module.exports = [
'last 1 version',
'> 1%',
'ie 10'
]
```
## Configuring for Different Environments
You can also specify different browser queries for various environments.
Browserslist will choose query according to `BROWSERSLIST_ENV` or `NODE_ENV`
variables. If none of them is declared, Browserslist will firstly look
for `production` queries and then use defaults.
In `package.json`:
```js
"browserslist": {
"production": [
"> 1%",
"ie 10"
],
"modern": [
"last 1 chrome version",
"last 1 firefox version"
],
"ssr": [
"node 12"
]
}
```
In `.browserslistrc` config:
```ini
[production]
> 1%
ie 10
[modern]
last 1 chrome version
last 1 firefox version
[ssr]
node 12
```
## Custom Usage Data
If you have a website, you can query against the usage statistics of your site.
[`browserslist-ga`] will ask access to Google Analytics and then generate
`browserslist-stats.json`:
```
npx browserslist-ga
```
Of course, you can generate usage statistics file by any other method.
File format should be like:
```js
{
"ie": {
"6": 0.01,
"7": 0.4,
"8": 1.5
},
"chrome": {
…
},
…
}
```
Note that you can query against your custom usage data
while also querying against global or regional data.
For example, the query `> 1% in my stats, > 5% in US, 10%` is permitted.
[`browserslist-ga`]: https://github.com/browserslist/browserslist-ga
[Can I Use]: https://caniuse.com/
## JS API
```js
const browserslist = require('browserslist')
// Your CSS/JS build tool code
function process (source, opts) {
const browsers = browserslist(opts.overrideBrowserslist, {
stats: opts.stats,
path: opts.file,
env: opts.env
})
// Your code to add features for selected browsers
}
```
Queries can be a string `"> 1%, IE 10"`
or an array `['> 1%', 'IE 10']`.
If a query is missing, Browserslist will look for a config file.
You can provide a `path` option (that can be a file) to find the config file
relatively to it.
Options:
* `path`: file or a directory path to look for config file. Default is `.`.
* `env`: what environment section use from config. Default is `production`.
* `stats`: custom usage statistics data.
* `config`: path to config if you want to set it manually.
* `ignoreUnknownVersions`: do not throw on direct query (like `ie 12`).
Default is `false.`
* `dangerousExtend`: Disable security checks for `extend` query.
Default is `false.`
* `mobileToDesktop`: Use desktop browsers if Can I Use doesn’t have data
about this mobile version. For instance, Browserslist will return
`chrome 20` on `and_chr 20` query (Can I Use has only data only about
latest versions of mobile browsers). Default is `false`.
For non-JS environment and debug purpose you can use CLI tool:
```sh
browserslist "> 1%, IE 10"
```
You can get total users coverage for selected browsers by JS API:
```js
browserslist.coverage(browserslist('> 1%'))
//=> 81.4
```
```js
browserslist.coverage(browserslist('> 1% in US'), 'US')
//=> 83.1
```
```js
browserslist.coverage(browserslist('> 1% in my stats'), 'my stats')
//=> 83.1
```
```js
browserslist.coverage(browserslist('> 1% in my stats', { stats }), stats)
//=> 82.2
```
Or by CLI:
```sh
$ browserslist --coverage "> 1%"
These browsers account for 81.4% of all users globally
```
```sh
$ browserslist --coverage=US "> 1% in US"
These browsers account for 83.1% of all users in the US
```
```sh
$ browserslist --coverage "> 1% in my stats"
These browsers account for 83.1% of all users in custom statistics
```
```sh
$ browserslist --coverage "> 1% in my stats" --stats=./stats.json
These browsers account for 83.1% of all users in custom statistics
```
## Environment Variables
If some tool use Browserslist inside, you can change browsers settings
by [environment variables]:
* `BROWSERSLIST` with browsers queries.
```sh
BROWSERSLIST="> 5%" gulp css
```
* `BROWSERSLIST_CONFIG` with path to config file.
```sh
BROWSERSLIST_CONFIG=./config/browserslist gulp css
```
* `BROWSERSLIST_ENV` with environments string.
```sh
BROWSERSLIST_ENV="development" gulp css
```
* `BROWSERSLIST_STATS` with path to the custom usage data
for `> 1% in my stats` query.
```sh
BROWSERSLIST_STATS=./config/usage_data.json gulp css
```
* `BROWSERSLIST_DISABLE_CACHE` if you want to disable config reading cache.
```sh
BROWSERSLIST_DISABLE_CACHE=1 gulp css
```
[environment variables]: https://en.wikipedia.org/wiki/Environment_variable
## Cache
Browserslist caches the configuration it reads from `package.json` and
`browserslist` files, as well as knowledge about the existence of files,
for the duration of the hosting process.
To clear these caches, use:
```js
browserslist.clearCaches()
```
To disable the caching altogether, set the `BROWSERSLIST_DISABLE_CACHE`
environment variable.
## Security Contact
To report a security vulnerability, please use the [Tidelift security contact].
Tidelift will coordinate the fix and disclosure.
[Tidelift security contact]: https://tidelift.com/security

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var BrowserslistError = require('./error')
function noop () { }
module.exports = {
loadQueries: function loadQueries () {
throw new BrowserslistError(
'Sharable configs are not supported in client-side build of Browserslist')
},
getStat: function getStat (opts) {
return opts.stats
},
loadConfig: function loadConfig (opts) {
if (opts.config) {
throw new BrowserslistError(
'Browserslist config are not supported in client-side build')
}
},
loadCountry: function loadCountry () {
throw new BrowserslistError(
'Country statistics is not supported ' +
'in client-side build of Browserslist')
},
currentNode: function currentNode (resolve, context) {
return resolve(['maintained node versions'], context)[0]
},
parseConfig: noop,
readConfig: noop,
findConfig: noop,
clearCaches: noop,
oldDataWarning: noop
}

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#!/usr/bin/env node
var fs = require('fs')
var browserslist = require('./')
var pkg = require('./package.json')
var args = process.argv.slice(2)
var USAGE = 'Usage:\n' +
' ' + pkg.name + '\n' +
' ' + pkg.name + ' "QUERIES"\n' +
' ' + pkg.name + ' --json "QUERIES"\n' +
' ' + pkg.name + ' --config="path/to/browserlist/file"\n' +
' ' + pkg.name + ' --coverage "QUERIES"\n' +
' ' + pkg.name + ' --coverage=US "QUERIES"\n' +
' ' + pkg.name + ' --coverage=US,RU,global "QUERIES"\n' +
' ' + pkg.name + ' --env="environment name defined in config"\n' +
' ' + pkg.name + ' --stats="path/to/browserlist/stats/file"'
function isArg (arg) {
return args.some(function (str) {
return str === arg || str.indexOf(arg + '=') === 0
})
}
function error (msg) {
process.stderr.write(pkg.name + ': ' + msg + '\n')
process.exit(1)
}
if (isArg('--help') || isArg('-h')) {
process.stdout.write(pkg.description + '.\n\n' + USAGE + '\n')
} else if (isArg('--version') || isArg('-v')) {
process.stdout.write(pkg.name + ' ' + pkg.version + '\n')
} else {
var mode = 'browsers'
var opts = { }
var queries
var areas
for (var i = 0; i < args.length; i++) {
if (args[i][0] !== '-') {
queries = args[i].replace(/^["']|["']$/g, '')
continue
}
var arg = args[i].split('=')
var name = arg[0]
var value = arg[1]
if (value) value = value.replace(/^["']|["']$/g, '')
if (name === '--config' || name === '-b') {
opts.config = value
} else if (name === '--env' || name === '-e') {
opts.env = value
} else if (name === '--stats' || name === '-s') {
opts.stats = value
} else if (name === '--coverage' || name === '-c') {
if (mode !== 'json') mode = 'coverage'
if (value) {
areas = value.split(',')
} else {
areas = ['global']
}
} else if (name === '--json') {
mode = 'json'
} else {
error('Unknown arguments ' + args[i] + '.\n\n' + USAGE)
}
}
var browsers
try {
browsers = browserslist(queries, opts)
} catch (e) {
if (e.name === 'BrowserslistError') {
error(e.message)
} else {
throw e
}
}
var coverage
if (mode === 'browsers') {
browsers.forEach(function (browser) {
process.stdout.write(browser + '\n')
})
} else if (areas) {
coverage = areas.map(function (area) {
var stats
if (area !== 'global') {
stats = area
} else if (opts.stats) {
stats = JSON.parse(fs.readFileSync(opts.stats))
}
var result = browserslist.coverage(browsers, stats)
var round = Math.round(result * 100) / 100.0
return [area, round]
})
if (mode === 'coverage') {
var prefix = 'These browsers account for '
process.stdout.write(prefix)
coverage.forEach(function (data, index) {
var area = data[0]
var round = data[1]
var end = 'globally'
if (area && area !== 'global') {
end = 'in the ' + area.toUpperCase()
} else if (opts.stats) {
end = 'in custom statistics'
}
if (index !== 0) {
process.stdout.write(prefix.replace(/./g, ' '))
}
process.stdout.write(round + '% of all users ' + end + '\n')
})
}
}
if (mode === 'json') {
var data = { browsers: browsers }
if (coverage) {
data.coverage = coverage.reduce(function (object, j) {
object[j[0]] = j[1]
return object
}, { })
}
process.stdout.write(JSON.stringify(data, null, ' ') + '\n')
}
}

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function BrowserslistError (message) {
this.name = 'BrowserslistError'
this.message = message
this.browserslist = true
if (Error.captureStackTrace) {
Error.captureStackTrace(this, BrowserslistError)
}
}
BrowserslistError.prototype = Error.prototype
module.exports = BrowserslistError

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var region = require('caniuse-lite/dist/unpacker/region').default
var path = require('path')
var fs = require('fs')
var BrowserslistError = require('./error')
var IS_SECTION = /^\s*\[(.+)\]\s*$/
var CONFIG_PATTERN = /^browserslist-config-/
var SCOPED_CONFIG__PATTERN = /@[^/]+\/browserslist-config(-|$|\/)/
var TIME_TO_UPDATE_CANIUSE = 6 * 30 * 24 * 60 * 60 * 1000
var FORMAT = 'Browserslist config should be a string or an array ' +
'of strings with browser queries'
var dataTimeChecked = false
var filenessCache = { }
var configCache = { }
function checkExtend (name) {
var use = ' Use `dangerousExtend` option to disable.'
if (!CONFIG_PATTERN.test(name) && !SCOPED_CONFIG__PATTERN.test(name)) {
throw new BrowserslistError(
'Browserslist config needs `browserslist-config-` prefix. ' + use)
}
if (name.replace(/^@[^/]+\//, '').indexOf('.') !== -1) {
throw new BrowserslistError(
'`.` not allowed in Browserslist config name. ' + use)
}
if (name.indexOf('node_modules') !== -1) {
throw new BrowserslistError(
'`node_modules` not allowed in Browserslist config.' + use)
}
}
function isFile (file) {
if (file in filenessCache) {
return filenessCache[file]
}
var result = fs.existsSync(file) && fs.statSync(file).isFile()
if (!process.env.BROWSERSLIST_DISABLE_CACHE) {
filenessCache[file] = result
}
return result
}
function eachParent (file, callback) {
var loc = path.resolve(file)
do {
var result = callback(loc)
if (typeof result !== 'undefined') return result
} while (loc !== (loc = path.dirname(loc)))
return undefined
}
function check (section) {
if (Array.isArray(section)) {
for (var i = 0; i < section.length; i++) {
if (typeof section[i] !== 'string') {
throw new BrowserslistError(FORMAT)
}
}
} else if (typeof section !== 'string') {
throw new BrowserslistError(FORMAT)
}
}
function pickEnv (config, opts) {
if (typeof config !== 'object') return config
var name
if (typeof opts.env === 'string') {
name = opts.env
} else if (process.env.BROWSERSLIST_ENV) {
name = process.env.BROWSERSLIST_ENV
} else if (process.env.NODE_ENV) {
name = process.env.NODE_ENV
} else {
name = 'production'
}
return config[name] || config.defaults
}
function parsePackage (file) {
var config = JSON.parse(fs.readFileSync(file))
if (config.browserlist && !config.browserslist) {
throw new BrowserslistError(
'`browserlist` key instead of `browserslist` in ' + file)
}
var list = config.browserslist
if (Array.isArray(list) || typeof list === 'string') {
list = { defaults: list }
}
for (var i in list) {
check(list[i])
}
return list
}
function latestReleaseTime (agents) {
var latest = 0
for (var name in agents) {
var dates = agents[name].releaseDate || { }
for (var key in dates) {
if (latest < dates[key]) {
latest = dates[key]
}
}
}
return latest * 1000
}
module.exports = {
loadQueries: function loadQueries (context, name) {
if (!context.dangerousExtend) checkExtend(name)
// eslint-disable-next-line security/detect-non-literal-require
var queries = require(require.resolve(name, { paths: ['.'] }))
if (!Array.isArray(queries)) {
throw new BrowserslistError(
'`' + name + '` config exports not an array of queries')
}
return queries
},
getStat: function getStat (opts, data) {
var stats
if (opts.stats) {
stats = opts.stats
} else if (process.env.BROWSERSLIST_STATS) {
stats = process.env.BROWSERSLIST_STATS
} else if (opts.path && path.resolve && fs.existsSync) {
stats = eachParent(opts.path, function (dir) {
var file = path.join(dir, 'browserslist-stats.json')
return isFile(file) ? file : undefined
})
}
if (typeof stats === 'string') {
try {
stats = JSON.parse(fs.readFileSync(stats))
} catch (e) {
throw new BrowserslistError('Can\'t read ' + stats)
}
}
if (stats && 'dataByBrowser' in stats) {
stats = stats.dataByBrowser
}
if (typeof stats !== 'object') return undefined
var normalized = { }
for (var i in stats) {
var versions = Object.keys(stats[i])
if (versions.length === 1 && data[i] && data[i].versions.length === 1) {
var normal = Object.keys(data[i].versions)[0]
normalized[i] = { }
normalized[i][normal] = stats[i][versions[0]]
} else {
normalized[i] = stats[i]
}
}
return normalized
},
loadConfig: function loadConfig (opts) {
if (process.env.BROWSERSLIST) {
return process.env.BROWSERSLIST
} else if (opts.config || process.env.BROWSERSLIST_CONFIG) {
var file = opts.config || process.env.BROWSERSLIST_CONFIG
if (path.basename(file) === 'package.json') {
return pickEnv(parsePackage(file), opts)
} else {
return pickEnv(module.exports.readConfig(file), opts)
}
} else if (opts.path) {
return pickEnv(module.exports.findConfig(opts.path), opts)
} else {
return undefined
}
},
loadCountry: function loadCountry (usage, country) {
var code = country.replace(/[^\w-]/g, '')
if (!usage[code]) {
// eslint-disable-next-line security/detect-non-literal-require
var compressed = require('caniuse-lite/data/regions/' + code + '.js')
var data = region(compressed)
usage[country] = { }
for (var i in data) {
for (var j in data[i]) {
usage[country][i + ' ' + j] = data[i][j]
}
}
}
},
parseConfig: function parseConfig (string) {
var result = { defaults: [] }
var sections = ['defaults']
string.toString()
.replace(/#[^\n]*/g, '')
.split(/\n|,/)
.map(function (line) {
return line.trim()
})
.filter(function (line) {
return line !== ''
})
.forEach(function (line) {
if (IS_SECTION.test(line)) {
sections = line.match(IS_SECTION)[1].trim().split(' ')
sections.forEach(function (section) {
if (result[section]) {
throw new BrowserslistError(
'Duplicate section ' + section + ' in Browserslist config')
}
result[section] = []
})
} else {
sections.forEach(function (section) {
result[section].push(line)
})
}
})
return result
},
readConfig: function readConfig (file) {
if (!isFile(file)) {
throw new BrowserslistError('Can\'t read ' + file + ' config')
}
return module.exports.parseConfig(fs.readFileSync(file))
},
findConfig: function findConfig (from) {
from = path.resolve(from)
var cacheKey = isFile(from) ? path.dirname(from) : from
if (cacheKey in configCache) {
return configCache[cacheKey]
}
var resolved = eachParent(from, function (dir) {
var config = path.join(dir, 'browserslist')
var pkg = path.join(dir, 'package.json')
var rc = path.join(dir, '.browserslistrc')
var pkgBrowserslist
if (isFile(pkg)) {
try {
pkgBrowserslist = parsePackage(pkg)
} catch (e) {
if (e.name === 'BrowserslistError') throw e
console.warn(
'[Browserslist] Could not parse ' + pkg + '. Ignoring it.')
}
}
if (isFile(config) && pkgBrowserslist) {
throw new BrowserslistError(
dir + ' contains both browserslist and package.json with browsers')
} else if (isFile(rc) && pkgBrowserslist) {
throw new BrowserslistError(
dir + ' contains both .browserslistrc and package.json with browsers')
} else if (isFile(config) && isFile(rc)) {
throw new BrowserslistError(
dir + ' contains both .browserslistrc and browserslist')
} else if (isFile(config)) {
return module.exports.readConfig(config)
} else if (isFile(rc)) {
return module.exports.readConfig(rc)
} else {
return pkgBrowserslist
}
})
if (!process.env.BROWSERSLIST_DISABLE_CACHE) {
configCache[cacheKey] = resolved
}
return resolved
},
clearCaches: function clearCaches () {
dataTimeChecked = false
filenessCache = { }
configCache = { }
},
oldDataWarning: function oldDataWarning (agentsObj) {
if (dataTimeChecked) return
dataTimeChecked = true
if (process.env.BROWSERSLIST_IGNORE_OLD_DATA) return
var latest = latestReleaseTime(agentsObj)
var halfYearAgo = Date.now() - TIME_TO_UPDATE_CANIUSE
if (latest !== 0 && latest < halfYearAgo) {
var command = 'npm update'
eachParent(__filename, function (dir) {
var pckg = path.join(dir, 'package.json')
var yarnLock = path.join(dir, 'yarn.lock')
if (isFile(pckg) && isFile(yarnLock)) {
command = 'yarn upgrade'
}
})
console.warn(
'Browserslist: caniuse-lite is outdated. ' +
'Please run next command `' + command + '`'
)
}
},
currentNode: function currentNode () {
return 'node ' + process.versions.node
}
}

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{
"_from": "browserslist@^4.6.3",
"_id": "browserslist@4.6.6",
"_inBundle": false,
"_integrity": "sha512-D2Nk3W9JL9Fp/gIcWei8LrERCS+eXu9AM5cfXA8WEZ84lFks+ARnZ0q/R69m2SV3Wjma83QDDPxsNKXUwdIsyA==",
"_location": "/browserslist",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "browserslist@^4.6.3",
"name": "browserslist",
"escapedName": "browserslist",
"rawSpec": "^4.6.3",
"saveSpec": null,
"fetchSpec": "^4.6.3"
},
"_requiredBy": [
"/autoprefixer",
"/caniuse-api",
"/postcss-colormin",
"/postcss-merge-rules",
"/postcss-minify-params",
"/postcss-normalize-unicode",
"/postcss-reduce-initial",
"/stylehacks"
],
"_resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.6.6.tgz",
"_shasum": "6e4bf467cde520bc9dbdf3747dafa03531cec453",
"_spec": "browserslist@^4.6.3",
"_where": "D:\\Air66 Files\\dev_sites\\www.airurl.dev.cc\\user\\plugins\\air66Theme\\node_modules\\autoprefixer",
"author": {
"name": "Andrey Sitnik",
"email": "andrey@sitnik.ru"
},
"bin": {
"browserslist": "./cli.js"
},
"browser": {
"./node.js": "./browser.js",
"path": false
},
"bugs": {
"url": "https://github.com/browserslist/browserslist/issues"
},
"bundleDependencies": false,
"dependencies": {
"caniuse-lite": "^1.0.30000984",
"electron-to-chromium": "^1.3.191",
"node-releases": "^1.1.25"
},
"deprecated": false,
"description": "Share target browsers between different front-end tools, like Autoprefixer, Stylelint and babel-env-preset",
"homepage": "https://github.com/browserslist/browserslist#readme",
"keywords": [
"caniuse",
"browsers",
"target"
],
"license": "MIT",
"name": "browserslist",
"repository": {
"type": "git",
"url": "git+https://github.com/browserslist/browserslist.git"
},
"version": "4.6.6"
}