Add fixWebpackSourcePath option

Author: jvanbruegge

README.md

@@ -124,6 +124,7 @@ The loader supports all options supported by `istanbul-lib-instrument`
 |**`coverageVariable`**|`{String}`|`__coverage__`|Name of global coverage variable|
 |**`preserveComments`**|`{Boolean}`|`false`|Preserve comments in `output`|
 |**`produceSourceMap`**|`{Boolean}`|`false`|Set to `true` to produce a source map for the instrumented code|
+|**`fixWebpackSourcePaths`**|`{Boolean}`|`false`|Set to `true` to prevent filepath error in coverage|
 |**`sourceMapUrlCallback`**|`{Function}`|`null`|A callback function that is called when a source map URL is found in the original code. This function is called with the source filename and the source map URL|
 
 **webpack.config.js**

src/index.js

@@ -22,6 +22,13 @@ export default function (source, sourceMap) {
   const instrumenter = createInstrumenter(options);
 
   instrumenter.instrument(source, this.resourcePath, (error, instrumentedSource) => {
-    this.callback(error, instrumentedSource, instrumenter.lastSourceMap());
+    let src = instrumentedSource;
+    if (options.fixWebpackSourcePaths) {
+      src = src.replace(/sources:\[([^\]])*\]/g, (match) => {
+        const splits = match.split('!');
+        return `sources:['${splits[splits.length - 1]}`;
+      });
+    }
+    this.callback(error, src, instrumenter.lastSourceMap());
   }, srcMap);
 }

src/options.json

@@ -21,6 +21,9 @@
     },
     "produceSourceMap": {
       "type": "boolean"
+    },
+    "fixWebpackSourcePaths": {
+      "type": "boolean"
     }
   },
   "additionalProperties": true