update

node_modules/clean-css/lib/options/compatibility.js

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+var DEFAULTS = {
+  '*': {
+    colors: {
+      opacity: true // rgba / hsla
+    },
+    properties: {
+      backgroundClipMerging: true, // background-clip to shorthand
+      backgroundOriginMerging: true, // background-origin to shorthand
+      backgroundSizeMerging: true, // background-size to shorthand
+      colors: true, // any kind of color transformations, like `#ff00ff` to `#f0f` or `#fff` into `red`
+      ieBangHack: false, // !ie suffix hacks on IE<8
+      ieFilters: false, // whether to preserve `filter` and `-ms-filter` properties
+      iePrefixHack: false, // underscore / asterisk prefix hacks on IE
+      ieSuffixHack: false, // \9 suffix hacks on IE6-9
+      merging: true, // merging properties into one
+      shorterLengthUnits: false, // optimize pixel units into `pt`, `pc` or `in` units
+      spaceAfterClosingBrace: true, // 'url() no-repeat' to 'url()no-repeat'
+      urlQuotes: false, // whether to wrap content of `url()` into quotes or not
+      zeroUnits: true // 0[unit] -> 0
+    },
+    selectors: {
+      adjacentSpace: false, // div+ nav Android stock browser hack
+      ie7Hack: false, // *+html hack
+      mergeablePseudoClasses: [
+        ':active',
+        ':after',
+        ':before',
+        ':empty',
+        ':checked',
+        ':disabled',
+        ':empty',
+        ':enabled',
+        ':first-child',
+        ':first-letter',
+        ':first-line',
+        ':first-of-type',
+        ':focus',
+        ':hover',
+        ':lang',
+        ':last-child',
+        ':last-of-type',
+        ':link',
+        ':not',
+        ':nth-child',
+        ':nth-last-child',
+        ':nth-last-of-type',
+        ':nth-of-type',
+        ':only-child',
+        ':only-of-type',
+        ':root',
+        ':target',
+        ':visited'
+      ], // selectors with these pseudo-classes can be merged as these are universally supported
+      mergeablePseudoElements: [
+        '::after',
+        '::before',
+        '::first-letter',
+        '::first-line'
+      ], // selectors with these pseudo-elements can be merged as these are universally supported
+      mergeLimit: 8191, // number of rules that can be safely merged together
+      multiplePseudoMerging: true
+    },
+    units: {
+      ch: true,
+      in: true,
+      pc: true,
+      pt: true,
+      rem: true,
+      vh: true,
+      vm: true, // vm is vmin on IE9+ see https://developer.mozilla.org/en-US/docs/Web/CSS/length
+      vmax: true,
+      vmin: true,
+      vw: true
+    }
+  }
+};
+
+DEFAULTS.ie11 = DEFAULTS['*'];
+
+DEFAULTS.ie10 = DEFAULTS['*'];
+
+DEFAULTS.ie9 = merge(DEFAULTS['*'], {
+  properties: {
+    ieFilters: true,
+    ieSuffixHack: true
+  }
+});
+
+DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
+  colors: {
+    opacity: false
+  },
+  properties: {
+    backgroundClipMerging: false,
+    backgroundOriginMerging: false,
+    backgroundSizeMerging: false,
+    iePrefixHack: true,
+    merging: false
+  },
+  selectors: {
+    mergeablePseudoClasses: [
+      ':after',
+      ':before',
+      ':first-child',
+      ':first-letter',
+      ':focus',
+      ':hover',
+      ':visited'
+    ],
+    mergeablePseudoElements: []
+  },
+  units: {
+    ch: false,
+    rem: false,
+    vh: false,
+    vm: false,
+    vmax: false,
+    vmin: false,
+    vw: false
+  }
+});
+
+DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
+  properties: {
+    ieBangHack: true
+  },
+  selectors: {
+    ie7Hack: true,
+    mergeablePseudoClasses: [
+      ':first-child',
+      ':first-letter',
+      ':hover',
+      ':visited'
+    ]
+  },
+});
+
+function compatibilityFrom(source) {
+  return merge(DEFAULTS['*'], calculateSource(source));
+}
+
+function merge(source, target) {
+  for (var key in source) {
+    var value = source[key];
+
+    if (typeof value === 'object' && !Array.isArray(value)) {
+      target[key] = merge(value, target[key] || {});
+    } else {
+      target[key] = key in target ? target[key] : value;
+    }
+  }
+
+  return target;
+}
+
+function calculateSource(source) {
+  if (typeof source == 'object')
+    return source;
+
+  if (!/[,\+\-]/.test(source))
+    return DEFAULTS[source] || DEFAULTS['*'];
+
+  var parts = source.split(',');
+  var template = parts[0] in DEFAULTS ?
+    DEFAULTS[parts.shift()] :
+    DEFAULTS['*'];
+
+  source = {};
+
+  parts.forEach(function (part) {
+    var isAdd = part[0] == '+';
+    var key = part.substring(1).split('.');
+    var group = key[0];
+    var option = key[1];
+
+    source[group] = source[group] || {};
+    source[group][option] = isAdd;
+  });
+
+  return merge(template, source);
+}
+
+module.exports = compatibilityFrom;