CHANGELOG.md

@@ -2,6 +2,16 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+<a name="2.0.3"></a>
+## [2.0.3](https://github.com/postcss/postcss-loader/compare/v2.0.2...v2.0.3) (2017-05-09)
+
+
+### Bug Fixes
+
+* **index:** don't fail on 'sourceMap: false' && emit a warning instead, when previous map found (`options.sourceMap`) ([159b66a](https://github.com/postcss/postcss-loader/commit/159b66a))
+
+
+
 <a name="2.0.2"></a>
 ## [2.0.2](https://github.com/postcss/postcss-loader/compare/v2.0.1...v2.0.2) (2017-05-09)
 

lib/index.js

@@ -127,8 +127,12 @@ module.exports = function loader (css, map) {
       css = this.exec(css, this.resource)
     }
 
-    if (typeof map === 'string') map = JSON.parse(map)
-    if (map && map.mappings) options.map.prev = map
+    if (!sourceMap && map) {
+      this.emitWarning(`\n\n ⚠️  PostCSS Loader\n\nPrevious source map found, but options.sourceMap isn't set, this way the loader will discard the source map enterily for performance reasons, see https://github.com/postcss/postcss-loader#sourcemap for more info on the subject\n\n`)
+    }
+
+    if (sourceMap && typeof map === 'string') map = JSON.parse(map)
+    if (sourceMap && map) options.map.prev = map
 
     return postcss(plugins)
       .process(css, options)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "postcss-loader",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "description": "PostCSS loader for webpack",
   "main": "lib/index.js",
   "engines": {