Fix reference pass error in package config

src/assets/LESSAsset.js

@@ -13,10 +13,10 @@ class LESSAsset extends Asset {
  let less = await localRequire('less', this.name);
  let render = promisify(less.render.bind(less));
 
- let opts =
- this.package.less ||
- (await this.getConfig(['.lessrc', '.lessrc.js'])) ||
-  {};
+ let opts = Object.assign(
+ {},
+ this.package.less || (await this.getConfig(['.lessrc', '.lessrc.js']))
+ );
  opts.filename = this.name;
  opts.plugins = (opts.plugins || []).concat(urlPlugin(this));
 

src/assets/SASSAsset.js

@@ -15,10 +15,10 @@ class SASSAsset extends Asset {
  let sass = await localRequire('node-sass', this.name);
  let render = promisify(sass.render.bind(sass));
 
- let opts =
- this.package.sass ||
- (await this.getConfig(['.sassrc', '.sassrc.js'])) ||
-  {};
+ let opts = Object.assign(
+ {},
+ this.package.sass || (await this.getConfig(['.sassrc', '.sassrc.js']))
+ );
  opts.includePaths = (opts.includePaths || []).concat(
  path.dirname(this.name)
  );

src/transforms/postcss.js

@@ -31,7 +31,7 @@ async function getConfig(asset) {
  return;
  }
 
- config = config || {};
+ config = Object.assign({}, config);
 
  let postcssModulesConfig = {
  getJSON: (filename, json) => (asset.cssModules = json)

src/transforms/posthtml.js

@@ -26,7 +26,7 @@ async function getConfig(asset) {
  return;
  }
 
- config = config || {};
+ config = Object.assign({}, config);
  config.plugins = await loadPlugins(config.plugins, asset.name);
  config.skipParse = true;
  return config;