All files are showing Unknown with plugin.

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I’m trying to get nyc ava and babel to all place nice together.

I’ve done this a bunch of times, I’m not sure what’s going wrong now.

I was having an issue where async / await branches were showing as not covered, so this was working, I’m having trouble integrating the babel-plugin-istanbul plugin for tests.

I have two files in the project, src/index.js and src/test.js.

{
    "name": "example",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
        "test": "ava",
        "coverage": "NODE_ENV=test nyc npm run test",
        "report": "nyc report --reporter=html",
        "report:open": "open ./coverage/index.html",
        "cover": "npm run coverage && npm run report && npm run report:open"
    },
    "keywords": [],
    "author": "",
    "license": "ISC",
    "dependencies": {
        "babel-runtime": "^6.26.0",
        "bluebird": "^3.5.0",
        "lodash": "^4.17.4"
    },
    "devDependencies": {
        "ava": "^0.22.0",
        "babel-cli": "^6.26.0",
        "babel-plugin-istanbul": "^4.1.4",
        "babel-plugin-transform-runtime": "^6.23.0",
        "babel-preset-env": "^1.6.0",
        "babel-register": "^6.26.0",
        "nyc": "^11.2.1",
        "sinon": "^3.2.1",
        "testdouble": "^3.2.4"
    },
    "babel": {
        "presets": ["env"],
        "plugins": ["transform-runtime"],
        "env": {
            "test": {
                "plugins": ["istanbul"]
            }
        }
    },
    "ava": {
        "require": ["babel-register"],
        "babel": "inherit"
    },
    "nyc": {
        "sourceMap": false,
        "instrument": false
    }
}

Here’s whats running:

> example@1.0.0 coverage /Users/me/Desktop/example
> NODE_ENV=test nyc npm run test


> example@1.0.0 test /Users/me/Desktop/example
> ava


  11 passed
----------|----------|----------|----------|----------|----------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |
----------|----------|----------|----------|----------|----------------|
All files |  Unknown |  Unknown |  Unknown |  Unknown |                |
----------|----------|----------|----------|----------|----------------|

> example@1.0.0 report /Users/me/Desktop/example
> nyc report --reporter=html


> example@1.0.0 report:open /Users/em/Desktop/example
> open ./coverage/index.html

Why isn’t src/index.js showing in the coverage?

[kumarmudur]

I have same problem in nyc@11.2.1 version.

[reggi]

Still having this issue months after I created this ticket, and I just dug deeper into the issue, here are my findings.

I was receiving this issue in my HTML output for each file: https://github.com/istanbuljs/nyc/issues/239

And I was also receiving this in the newer version of nyc + babel-plugin-istanbul.

----------|----------|----------|----------|----------|-------------------|
File      |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
----------|----------|----------|----------|----------|-------------------|
All files |        0 |        0 |        0 |        0 |                   |
----------|----------|----------|----------|----------|-------------------|

I just learned several things the main one for now that I have confirmed is that:

⚠️ The babel-plugin-istanbul plugin needs to be the first babel plugin.

It seems I can get it working consistently by making this simple tweak to my settings.

This is what I am using, and it’s working properly.

⚠️ Something to look out for is to ensure that while you’re tinkering with settings, you don’t inadvertently ignore or exclude or not include the very files you are trying to cover, best to leave all these fields in nyc as default while trying to get it to work, when you do then you can fiddle with these settings.

{
  "scripts": {
    "babel": "babel --copy-files src -d dist --ignore test.js",
    "babel:watch": "npm run build --- --watch",
    "prebuild": "rm -rf dist",
    "build": "npm run babel",
    "build:watch": "npm run babel:watch",
    "coverage:file": "nyc npm run test:file",
    "coverage:files": "nyc npm run test:files",
    "lint": "npm run standard",
    "lint:fix": "npm run standard:fix",
    "pretest": "npm run standard",
    "test": "npm run coverage:files",
    "test:file": "NODE_ENV=test mocha --require babel-register",
    "test:files": "npm run test:file -- src/**/test.js"
  },
  "babel": {
    "env": {
      "test": {
        "plugins": [
          "istanbul",
          "rewire",
          "transform-runtime"
        ]
      }
    },
    "plugins": [
      "transform-runtime"
    ],
    "presets": [
      [
        "env",
        {
          "targets": {
            "node": "4.0.0"
          }
        }
      ],
      "stage-0"
    ]
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.0",
    "babel-eslint": "^8.2.2",
    "babel-plugin-istanbul": "^4.1.5",
    "babel-plugin-rewire": "^1.1.0",
    "babel-plugin-transform-runtime": "^6.23.0",
    "babel-polyfill": "^6.26.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-stage-0": "^6.24.1",
    "babel-register": "^6.26.0",
    "babel-template": "^6.26.0",
    "babel-types": "^6.26.0",
    "mocha": "^5.0.1",
    "nyc": "11.6.0",
  },
  "nyc": {
    "require": [
      "babel-register"
    ],
    "reporter": [
      "json",
      "lcov",
      "html",
      "text"
    ],
    "check-coverage": true,
    "per-file": false,
    "lines": 100,
    "statements": 100,
    "functions": 100,
    "branches": 100,
    "sourceMap": false,
    "instrument": false,
    "all": true
  },
}