CSS minifier with structural optimisations. 

CSS minifier with structural optimisations

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{{- packageName}} - npm Package Compare versions

- Added percent sign removal for zero percentages for some properties that is safe (@RubaXa, #286)

- Removed unit removal for zero values in `-ms-flex` due it breaks flex in IE10/11 (#362)

- Improved performance of selectors comparison (@smelukov, #343)

- Fixed merge of `position` declarations when `sticky` fallback is using (@gruzzilkin, #356)

- Migrated to [CSSTree](https://github.com/csstree/csstree) `1.0.0-alpha25`

    - Changed AST format (see [CSSTree change log](https://github.com/csstree/csstree/blob/master/HISTORY.md) for details)

    - Fixed performance issue when generate CSS with source map (quadratic increase in time depending on the size of the CSS)

- Fixed named color compression to apply only when an identifier is guaranteed to be a color

- Added lifting of `@keyframes` to the beginning of style sheet (chunk), but after `@charset` and `@import` rules

- Added removal of `@keyframes`, `@media` and `@supports` with no prelude

- Added removal of duplicate `@keyframes` (#202)

- Added new option `forceMediaMerge` to force media rules merging. It's unsafe in general, but works fine in many cases. Use it on your own risk (#350)

- Fixed crash on a number processing when it used not in a list (#335)

- Implemented optimisation for `none` keyword in `border` and `outline` properties (@zoobestik, #41)

- Implemented replacing `rgba(x, x, x, 0)` to `transparent`

- Fixed plus sign omitting for numbers following identifier, hex color, number or unicode range, since it can change the meaning of CSS (e.g. `calc(1px+2px)` has been optimized to `calc(1px2px)` before, now it stays the same)

- Improved usage filtering for nested selectors (i.e. for `:nth-*()`, `:has()`, `:matches` and other pseudos)

- Implemented `blacklist` filtering in usage (#334, see [Black list filtering](https://github.com/css/csso#black-list-filtering))

- Improved white space removing, now white spaces are removing in the beginning and at the ending of sequences, and between stylesheet and block nodes

- Fixed declaration merging when declaration contains an `!important`

- Migrated to [CSSTree](https://github.com/csstree/csstree) as AST backend and exposed its API behind `syntax` property

- Extracted CLI into standalone package [css/csso-cli](https://github.com/css/csso-cli)

- Added `beforeCompress` and `afterCompress` options support (#316)

- Fixed crash on empty argument in function (#317)

- Fixed shorthand optimisation issue when value has a color value or something unknown (#311)

- Implement AST cloning by adding `clone()` [function](https://github.com/css/csso#cloneast) and `clone` [option](https://github.com/css/csso#compressast-options) for `compress()` function (#296)

- Fix parse and translate attribute selector with flags but w/o operator (i.e. `[attrName i]`)

- Don't merge rules with flagged attribute selectors with others (#291)

- Take in account functions when merge TRBL-properties (#297, thanks to @ArturAralin)

- Tweak scanner, reduce code deoptimizations and other small improvements

- Fix wrong declaration with `\9` hack merge (#295)

- New option `comments` to specify what comments to left: `exclamation`, `first-exclamation` and `none`

- Add `offset` to CSS parse error details

- No more `gonzales` AST format and related code

- `minify()` and `minifyBlock()` is always return an object as result now (i.e. `{ css: String, map: SourceMapGenerator or null }`)

    - Returns AST in new format (so called `internal`)

    - New AST format + dynamic scanner = performance boost and less memory consumption

    - No more `context` argument, context should be specified via `options`

    - Supported contexts now: `stylesheet`, `atrule`, `atruleExpression`, `ruleset`, `selector`, `simpleSelector`, `block`, `declaration` and `value` 

    - Drop `needPositions` option, `positions` option should be used instead

    - Drop `needInfo` option, `info` object is attaching to nodes when some information is requested by `options`

    - `options` should be an object, otherwise it treats as empty object

    - No more AST converting (performance boost and less memory consumption)

    - Returns an object as result instead of AST (i.e. `{ ast: Object }`)

- Drop methods: `justDoIt()`, `stringify()`, `cleanInfo()`

- Don't remove spaces after function/braces/urls since unsafe (#289)

var packNumber = require('./Number').pack;

module.exports = function compressDimension(node, item) {

    var value = packNumber(node.value, item);

    if (value === '0' && this.declaration !== null && this.atrulePrelude === null) {

        var unit = node.unit.toLowerCase();

        // only length values can be compressed

        if (!LENGTH_UNIT.hasOwnProperty(unit)) {

        // issue #200: don't remove units in flex property as it could change value meaning

        if (this.declaration.property === 'flex') {

        // issue #362: shouldn't remove unit in -ms-flex since it breaks flex in IE10/11

        // issue #200: shouldn't remove unit in flex since it breaks flex in IE10/11

        if (this.declaration.property === '-ms-flex' ||

            this.declaration.property === 'flex') {

        // issue #222: don't remove units inside calc

        if (this['function'] && this['function'].name === 'calc') {

    AttributeSelector: require('./AttributeSelector'),

    HexColor: require('./color').compressHex,

    Identifier: require('./color').compressIdent,

    Function: require('./color').compressFunction

    walk(ast, function(node, item, list) {

        if (handlers.hasOwnProperty(node.type)) {

            handlers[node.type].call(this, node, item, list);

var hasOwnProperty = Object.prototype.hasOwnProperty;

    while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {

    return cursor1 === null && cursor2 === null;

function compareDeclarations(declarations1, declarations2) {

    var fingerprints = Object.create(null);

    var declarations2hash = Object.create(null);

    for (var cursor = declarations2.head; cursor; cursor = cursor.next)  {

        declarations2hash[cursor.data.id] = true;

    for (var cursor = declarations1.head; cursor; cursor = cursor.next)  {

            fingerprints[data.fingerprint] = data.important;

        if (declarations2hash[data.id]) {

            declarations2hash[data.id] = false;

            // if declarations1 has overriding declaration, this is not a difference

            // but take in account !important - prev should be equal or greater than follow

            if (hasOwnProperty.call(fingerprints, data.fingerprint) &&

                Number(fingerprints[data.fingerprint]) >= Number(data.important)) {

                result.ne2overrided.push(data);

            var nextStr = cursor.data.id;

        dest.insert(dest.createItem(sourceData), cursor);

// check if simpleselectors has no equal specificity and element selector

function hasSimilarSelectors(selectors1, selectors2) {

        return selectors2.some(function(b) {

            return a.compareMarker === b.compareMarker;

            if (cursor1.data.compareMarker === cursor2.data.compareMarker) {

		@@ -0,1 +1,7 @@
		## 3.4.0 (November 3, 2017)

		- Added percent sign removal for zero percentages for some properties that is safe (@RubaXa, #286)
		- Removed unit removal for zero values in `-ms-flex` due it breaks flex in IE10/11 (#362)
		- Improved performance of selectors comparison (@smelukov, #343)

		## 3.3.1 (October 17, 2017)
		@@ -2,0 +8,0 @@

+@@ -7,3 +7,3 @@ var walk = require('css-tree').walkUp;
+    Dimension: require('./Dimension'),
+    Percentage: require('./Number'),
+    Percentage: require('./Percentage'),
+    Number: require('./Number'),
+@@ -10,0 +10,0 @@ String: require('./String'),

		@@ -102,7 +102,19 @@ var hasOwnProperty = Object.prototype.hasOwnProperty;
		function hasSimilarSelectors(selectors1, selectors2) {
		return selectors1.some(function(a) {
		return selectors2.some(function(b) {
		return a.compareMarker === b.compareMarker;
		});
		});
		var cursor1 = selectors1.head;

		while (cursor1 !== null) {
		var cursor2 = selectors2.head;

		while (cursor2 !== null) {
		if (cursor1.data.compareMarker === cursor2.data.compareMarker) {
		return true;
		}

		cursor2 = cursor2.next;
		}

		cursor1 = cursor1.next;
		}

		return false;
		}
		@@ -109,0 +121,0 @@

		{
		"name": "csso",
		"version": "3.3.1",
		"version": "3.4.0",
		"description": "CSS minifier with structural optimisations",
		@@ -5,0 +5,0 @@ "keywords": [

Improved metrics

Worsened metrics

+@@ -38,4 +38,6 @@ var packNumber = require('./Number').pack;
+        // issue #200: don't remove units in flex property as it could change value meaning
+        if (this.declaration.property === 'flex') {
+        // issue #362: shouldn't remove unit in -ms-flex since it breaks flex in IE10/11
+        // issue #200: shouldn't remove unit in flex since it breaks flex in IE10/11
+        if (this.declaration.property === '-ms-flex' ||
+            this.declaration.property === 'flex') {
+            return;
+@@ -42,0 +44,0 @@ }