babel-istanbul-loader

babel-istanbul loader for webpack

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Readme

babel-istanbul instrumenter loader for webpack

npm travis deps
Instrument Babel code with babel-istanbul for subsequent code coverage reporting.

Install

$ npm i babel-istanbul-loader --save-dev

Setup

References

Project structure

Let's say you have the following:
├── src/
│   └── components/
│       ├── bar/
│       │   └── index.js
│       └── foo/
│           └── index.js
└── test/
    └── src/
        └── components/
            └── foo/
                └── index.js

To create a code coverage report for all components (even for those for which you have no tests yet) you have to require all the 1) sources and 2) tests. Something like it's described in "alternative usage" of karma-webpack:

test/index.js

// require all `test/components/**/index.js`
const testsContext = require.context('./src/components/', true, /index\.js$/);

testsContext.keys().forEach(testsContext);

// require all `src/components/**/index.js`
const componentsContext = require.context('../src/components/', true, /index\.js$/);

componentsContext.keys().forEach(componentsContext);

This file will be the only entry point for Karma:

karma.conf.js

config.set({
    …
    files: [
        'test/index.js'
    ],
    preprocessors: {
        'test/index.js': 'webpack'
    },
    webpack: {
        …
        module: {
            preLoaders: [
                // transpile all files except testing sources with babel as usual
                {
                    test: /\.js$/,
                    exclude: [
                        path.resolve('src/components/'),
                        path.resolve('node_modules/')
                    ],
                    loader: 'babel'
                },
                // transpile and instrument only testing sources with babel-istanbul
                {
                    test: /\.js$/,
                    include: path.resolve('src/components/'),
                    loader: 'babel-istanbul',
                    query: {
                        cacheDirectory: true
                        // see below for possible options
                    }
                }
            ]
        }
        …
    },
    reporters: [ 'progress', 'coverage' ],
    coverageReporter: {
        type: 'text'
    },
    …
});

Options


defaults:
{
    embedSource: true,
    noAutoWrap: true
}

  • cacheDirectory + cacheIdentifier – exactly the same cache options as in babel-loader.