`Path must be a string. Received undefined` in `addFileCoverage` method

[meowtec]

remap-istanbul/src/CoverageTransformer.js

Lines 142 to 143 in 03218fc

	origFileName = rawSourceMap.file;
	fileName = filePath.replace(path.extname(origFileName), path.extname(origSourceFilename));

rawSourceMap.file is undefined in coverage:

{
  "/path/to/app.vue": {
    "_coverageSchema": "332fd63041d2c1bcb487cc26dd0d5f7d97098a6c",
    "b": {},
    "branchMap": {},
    "f": {},
    "fnMap": {},
    "hash": "45eccc5edb832ac9107a13add75c37148a2a42ab",
    "inputSourceMap": {
      "mappings": ";;;;;AAKA;AACA",
      "names": [],
      "sourceRoot": "vuex",
      "sources": [
        "app.vue"
      ],
      "sourcesContent": [
        "<template>\n  <div></div>\n</template>\n<script>\n\nexport default {\n}\n</script>\n"
      ],
      "version": 3
    },
    "path": "/Users/berton/workspace/awesome-practice-projects/vuex/app.vue",
    "s": {},
    "statementMap": {},
    "l": {}
  }
}

[willpracht]

I believe this occurs if you're running node < 6.

I'll look deeper into this soon.

[meowtec]

No, I am using node 8.

I have find the reason: I am using vue-loader which generates sourcemap without file property.

see vuejs/vue-loader#1190

[willpracht]

@meowtec Cool, cool. Glad you figured out the problem. :)

[dylans]

Ok, as the issue with vue-loader has been fixed, I'm going to close this one out. Thanks!