grunt-cover-ts

Takes line coverage information and source maps to determine coverage for TypeScript.

This plugin has been designed to work with an lcov.info that is generated from Istanbul. It also has only been designed to re-map source maps generated by TypeScript that are peers of the emitted JavaScript. Because it simply walks the lcov.info and maps back via Mozilla's source-map, it may work in other use cases.

This plugin supports both external source map files as well as base64 encoded data URI's that can be embedded inline within the target file.

Getting Started

This plugin requires Grunt ~0.4.5

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-cover-ts --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-cover-ts');

The "map_coverage_json" task

Overview

In your project's Gruntfile, add a section named map_coverage_json to the data object passed into grunt.initConfig().

grunt.initConfig({
    map_coverage_json: {
        files: {
            src: 'coverage-final.json', // location of the source json
            dest: 'dest/coverage-final.json' // location of the destination json
        },
        your_target: {
            files: {
                src: 'tmp/coverage-final.json' // when using a specific target, location of your source json
            }
        }
    }
})

Usage Examples

Basic Usage

You just need to provide a location of a JSON coverage file and it will then be analysed and rewritten by the plugin, so basic usage would look something like this:

grunt.initConfig({
    map_coverage_json: {
        files: {
            src: 'coverage-final.info'
        }
    }
});

The "cover_ts" task

Overview

In your project's Gruntfile, add a section named cover_ts to the data object passed into grunt.initConfig().

grunt.initConfig({
  cover_ts: {
      files: {
          src: 'lcov.info', // location of the source lcov.info
          dest: 'dest/lcov.info' // location of the destination lcov.info
      },
      your_target: {
          files: {
              src: 'tmp/lcov.info'  // when using a specific target, location of your source lcov.info
          }
      }
  }
});

Usage Examples

Basic Usage

You just need to provide a location of a lcov.info and it will then be analysed and rewritten by the plugin, so basic usage would look something like this:

grunt.initConfig({
    cover_ts: {
        files: {
            src: 'lcov.info'
        }
    }
});

If you are then submitting your coverage information somewhere, just ensure that this task occurs after your coverage information is produced and before submission to the remote host.

If you omit a dest property, the task will assume you want to overwrite the original source. While the grunt task interface allows for multiple source file mappings to a single destination, that doesn't make a lot of sense with a lcov.info, but if there are multiple source files the task will simply concatenate these together into a single file.