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Showing content from https://github.com/clean-css/clean-css/commit/b6ddc523267fc42cf0f6bd1626a79cad97319e17 below:

Removes level 1 `transform` callback in favor of plugins. · clean-css/clean-css@b6ddc52 · GitHub

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 @@ -80,6 +80,7 @@ var output = new CleanCSS(options).minify(input);

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 clean-css 5.0 will introduce some breaking changes:

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 * Node.js 6.x and 8.x are officially no longer supported;

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+
 * `transform` callback in level-1 optimizations is removed in favor of new [plugins](#plugins) interface;

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 ## Important: 4.0 breaking changes

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 @@ -377,8 +378,7 @@ new CleanCSS({

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 specialComments: 'all', // denotes a number of /*! ... */ comments preserved; defaults to `all`

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 tidyAtRules: true, // controls at-rules (e.g. `@charset`, `@import`) optimizing; defaults to `true`

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 tidyBlockScopes: true, // controls block scopes (e.g. `@media`) optimizing; defaults to `true`

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-
 tidySelectors: true, // controls selectors optimizing; defaults to `true`,

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-
 transform: function () {} // defines a callback for fine-grained property optimization; defaults to no-op

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 tidySelectors: true, // controls selectors optimizing; defaults to `true`

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});


 @@ -448,7 +448,7 @@ In clean-css version 5 and above you can define plugins which run alongside leve

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 ```js

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 var myPlugin = {

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 level1: {

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-
 property: function removeRepeatedBackgroundRepeat() {

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 property: function removeRepeatedBackgroundRepeat(_rule, property, _options) {

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 // So `background-repeat:no-repeat no-repeat` becomes `background-repeat:no-repeat`

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 if (property.name == 'background-repeat' && property.value.length == 2 && property.value[0][1] == property.value[1][1]) {

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 property.value.pop();


 @@ -561,26 +561,7 @@ If you don't provide a callback, then remote `@import`s will be left as is.

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 ## How to apply arbitrary transformations to CSS properties?

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-
 If clean-css doesn't perform a particular property optimization, you can use `transform` callback to apply it:

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-
 ```js

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 var source = '.block{background-image:url(/path/to/image.png)}';

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 var output = new CleanCSS({

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 level: {

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-
 1: {

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-
 transform: function (propertyName, propertyValue, selector /* `selector` available since 4.2.0-pre */) {

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 if (propertyName == 'background-image' && propertyValue.indexOf('/path/to') > -1) {

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 return propertyValue.replace('/path/to', '../valid/path/to');

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 }

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 }

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 }

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 }

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 }).minify(source);

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 console.log(output.styles); # => .block{background-image:url(../valid/path/to/image.png)}

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 ```

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-
 Note: returning `false` from `transform` callback will drop a property.

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+
 Please see [plugins](#plugins).

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 ## How to specify a custom rounding precision?

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 @@ -20,8 +20,6 @@ var formatPosition = require('../../utils/format-position');

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 var serializeRules = require('../../writer/one-time').rules;

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-
 var IgnoreProperty = 'ignore-property';

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 var CHARSET_TOKEN = '@charset';

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 var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');

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 @@ -56,32 +54,13 @@ function isLegacyFilter(property) {

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 function noop() {}

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-
 function transformValue(propertyName, propertyValue, rule, options) {

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 var selector;

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 var transformedValue;

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-
 if (!options.level[OptimizationLevel.One].transform) {

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 return propertyValue;

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 }

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-
 selector = serializeRules(rule);

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 transformedValue = options.level[OptimizationLevel.One].transform(propertyName, propertyValue, selector);

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-
 if (transformedValue === undefined) {

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 return propertyValue;

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 } else if (transformedValue === false) {

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 return IgnoreProperty;

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 } else {

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 return transformedValue;

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 }

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 }

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 function optimizeBody(rule, properties, context) {

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 var options = context.options;

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 var valueOptimizers;

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 var property, name, type, value;

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 var propertyToken;

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 var propertyOptimizer;

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 var serializedRule = serializeRules(rule);

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 var _properties = wrapForOptimizing(properties, true);

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 var pluginValueOptimizers = context.options.plugins.level1Value;

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 var pluginPropertyOptimizers = context.options.plugins.level1Property;


 @@ -157,20 +136,13 @@ function optimizeBody(rule, properties, context) {

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 value = pluginValueOptimizers[k](name, value, options);

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-
 value = transformValue(name, value, rule, options);

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-
 if (value === IgnoreProperty) {

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 property.unused = true;

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 continue propertyLoop;

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 }

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 property.value[j][1] = value;

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-
 propertyOptimizer(property, options);

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+
 propertyOptimizer(serializedRule, property, options);

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 for (j = 0, m = pluginPropertyOptimizers.length; j < m; j++) {

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-
 pluginPropertyOptimizers[j](property, options);

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+
 pluginPropertyOptimizers[j](serializedRule, property, options);

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 @@ -2,7 +2,7 @@ var OptimizationLevel = require('../../../options/optimization-level').Optimizat

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 var plugin = {

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 level1: {

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-
 property: function background(property, options) {

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+
 property: function background(_rule, property, options) {

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 var values = property.value;

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 if (!options.level[OptimizationLevel.One].optimizeBackground) {

Original file line number Diff line number Diff line change


 @@ -2,7 +2,7 @@ var OptimizationLevel = require('../../../options/optimization-level').Optimizat

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 var plugin = {

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 level1: {

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-
 property: function borderRadius(property, options) {

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+
 property: function borderRadius(_rule, property, options) {

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 var values = property.value;

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 if (!options.level[OptimizationLevel.One].optimizeBorderRadius) {

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 @@ -1,6 +1,6 @@

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 var plugin = {

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 level1: {

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-
 property: function boxShadow(property) {

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 property: function boxShadow(_rule, property) {

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 var values = property.value;

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 // remove multiple zeros

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 @@ -6,7 +6,7 @@ var WHITESPACE_AROUND_EQUALS_PATTERN = / ?= ?/g;

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 var plugin = {

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 level1: {

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-
 property: function filter(property, options) {

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 property: function filter(_rule, property, options) {

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 if (!options.compatibility.properties.ieFilters) {

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 return;

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Original file line number Diff line number Diff line change


 @@ -2,7 +2,7 @@ var OptimizationLevel = require('../../../options/optimization-level').Optimizat

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 var plugin = {

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 level1: {

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-
 property: function fontWeight(property, options) {

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+
 property: function fontWeight(_rule, property, options) {

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 var value = property.value[0][1];

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 if (!options.level[OptimizationLevel.One].optimizeFontWeight) {

Original file line number Diff line number Diff line change


 @@ -2,7 +2,7 @@ var OptimizationLevel = require('../../../options/optimization-level').Optimizat

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 var plugin = {

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 level1: {

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-
 property: function margin(property, options) {

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+
 property: function margin(_rule, property, options) {

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 var values = property.value;

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 if (!options.level[OptimizationLevel.One].replaceMultipleZeros) {

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 @@ -2,7 +2,7 @@ var OptimizationLevel = require('../../../options/optimization-level').Optimizat

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 var plugin = {

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 level1: {

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-
 property: function outline(property, options) {

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+
 property: function outline(_rule, property, options) {

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 var values = property.value;

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 if (!options.level[OptimizationLevel.One].optimizeOutline) {

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 @@ -6,7 +6,7 @@ function isNegative(value) {

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 var plugin = {

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 level1: {

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-
 property: function padding(property, options) {

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+
 property: function padding(_rule, property, options) {

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 var values = property.value;

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 // remove multiple zeros

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