chushihua

node_modules/optimize-css-assets-webpack-plugin/index.js

@@ -0,0 +1,76 @@
+var LastCallWebpackPlugin = require('last-call-webpack-plugin');
+
+function OptimizeCssAssetsPlugin(options) {
+  this.options = options || {};
+
+  if (this.options.assetNameRegExp === undefined) {
+    this.options.assetNameRegExp = /\.css$/g;
+  }
+
+  if (this.options.cssProcessor === undefined) {
+    this.options.cssProcessor = require('cssnano');
+  }
+
+  if (this.options.cssProcessorOptions === undefined) {
+    this.options.cssProcessorOptions = {};
+  }
+
+  if (this.options.canPrint === undefined) {
+    this.options.canPrint = true;
+  }
+
+  var self = this;
+  this.lastCallInstance = new LastCallWebpackPlugin({
+    assetProcessors: [
+      {
+        phase: LastCallWebpackPlugin.PHASE.OPTIMIZE_CHUNK_ASSETS,
+        regExp: this.options.assetNameRegExp,
+        processor: function (assetName, asset, assets) {
+          return self.processCss(assetName, asset, assets);
+        },
+      }
+    ],
+    canPrint: this.options.canPrint
+  });
+};
+
+OptimizeCssAssetsPlugin.prototype.processCss = function(assetName, asset, assets) {
+  var css = asset.source();
+  var processOptions = Object.assign(
+    { from: assetName, to: assetName },
+    this.options.cssProcessorOptions || {}
+  );
+  if (processOptions.map && !processOptions.map.prev) {
+    try {
+      var mapJson = assets.getAsset(assetName + '.map');
+      if (mapJson) {
+        var map = JSON.parse(mapJson);
+        if (
+          map &&
+          (
+            (map.sources && map.sources.length > 0) ||
+            (map.mappings && map.mappings.length > 0)
+          )
+        ) {
+          processOptions.map = Object.assign({ prev: mapJson }, processOptions.map);
+        }
+      }
+    } catch (err) {
+      console.warn('OptimizeCssAssetsPlugin.processCss() Error getting previous source map', err);
+    }
+  }
+  return this.options
+    .cssProcessor.process(css, processOptions)
+    .then(r => {
+      if (processOptions.map && r.map && r.map.toString) {
+        assets.setAsset(assetName + '.map', r.map.toString());
+      }
+      return r.css;
+    });
+};
+
+OptimizeCssAssetsPlugin.prototype.apply = function(compiler) {
+  return this.lastCallInstance.apply(compiler);
+};
+
+module.exports = OptimizeCssAssetsPlugin;