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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.
+
+[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
+[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. [Shareable Configs](#shareable-configs)
+6. [Configuring for Different Environments](#configuring-for-different-environments)
+7. [Custom Usage Data](#custom-usage-data)
+8. [JS API](#js-api)
+9. [Environment Variables](#environment-variables)
+10. [Cache](#cache)
+
+## Tools
+
+* [`browserslist-ga`] and [`browserslist-ga-export`] download 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-regexp`]: https://github.com/browserslist/browserslist-useragent-regexp
+[`browserslist-useragent-ruby`]:   https://github.com/browserslist/browserslist-useragent-ruby
+[`browserslist-browserstack`]:     https://github.com/xeroxinteractive/browserslist-browserstack
+[`browserslist-ga-export`]:        https://github.com/browserslist/browserslist-ga-export
+[`browserslist-useragent`]:        https://github.com/pastelsky/browserslist-useragent
+[`browserslist-ga`]:               https://github.com/browserslist/browserslist-ga
+[`caniuse-api`]:                   https://github.com/Nyalab/caniuse-api
+
+
+## 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 these 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.
+* `PhantomJS 2.1` and `PhantomJS 1.9`: selects Safari versions similar
+  to PhantomJS runtime.
+* `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
+```
+
+Or you can use [`browserslist-ga-export`] to convert Google Analytics data without giving a password for Google account.
+
+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-export`]: https://github.com/browserslist/browserslist-ga-export
+[`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