autoprefixer.js
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'use strict';
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
var browserslist = require('browserslist');
var postcss = require('postcss');
var Browsers = require('./browsers');
var Prefixes = require('./prefixes');
function isPlainObject(obj) {
return Object.prototype.toString.apply(obj) === '[object Object]';
}
var cache = {};
function timeCapsule(result, prefixes) {
if (prefixes.browsers.selected.length === 0) {
return;
}
if (prefixes.add.selectors.length > 0) {
return;
}
if (Object.keys(prefixes.add).length > 2) {
return;
}
/* istanbul ignore next */
result.warn('Greetings, time traveller. ' + 'We are in the golden age of prefix-less CSS, ' + 'where Autoprefixer is no longer needed for your stylesheet.');
}
module.exports = postcss.plugin('autoprefixer', function () {
for (var _len = arguments.length, reqs = Array(_len), _key = 0; _key < _len; _key++) {
reqs[_key] = arguments[_key];
}
var options = void 0;
if (reqs.length === 1 && isPlainObject(reqs[0])) {
options = reqs[0];
reqs = undefined;
} else if (reqs.length === 0 || reqs.length === 1 && !reqs[0]) {
reqs = undefined;
} else if (reqs.length <= 2 && (reqs[0] instanceof Array || !reqs[0])) {
options = reqs[1];
reqs = reqs[0];
} else if (_typeof(reqs[reqs.length - 1]) === 'object') {
options = reqs.pop();
}
if (!options) {
options = {};
}
if (options.browser) {
throw new Error('Change `browser` option to `browsers` in Autoprefixer');
} else if (options.browserslist) {
throw new Error('Change `browserslist` option to `browsers` in Autoprefixer');
}
if (options.browsers) {
reqs = options.browsers;
}
if (typeof options.grid === 'undefined') {
options.grid = false;
}
var loadPrefixes = function loadPrefixes(opts) {
var data = module.exports.data;
var browsers = new Browsers(data.browsers, reqs, opts, options.stats);
var key = browsers.selected.join(', ') + JSON.stringify(options);
if (!cache[key]) {
cache[key] = new Prefixes(data.prefixes, browsers, options);
}
return cache[key];
};
var plugin = function plugin(css, result) {
var prefixes = loadPrefixes({
from: css.source && css.source.input.file,
env: options.env
});
timeCapsule(result, prefixes);
if (options.remove !== false) {
prefixes.processor.remove(css, result);
}
if (options.add !== false) {
prefixes.processor.add(css, result);
}
};
plugin.options = options;
plugin.browsers = reqs;
plugin.info = function (opts) {
opts = opts || {};
opts.from = opts.from || process.cwd();
return require('./info')(loadPrefixes(opts));
};
return plugin;
});
/**
* Autoprefixer data
*/
module.exports.data = {
browsers: require('caniuse-lite').agents,
prefixes: require('../data/prefixes')
};
/**
* Autoprefixer default browsers
*/
module.exports.defaults = browserslist.defaults;
/**
* Inspect with default Autoprefixer
*/
module.exports.info = function () {
return module.exports().info();
};