Package Exports

karma-sourcemap-loader

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (karma-sourcemap-loader) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

karma-sourcemap-loader

Preprocessor that locates and loads existing source maps.

Why

When you use karma not in isolation but as part of a build process (e.g. using grunt or gulp) it is often the case that the compilation/transpilation is done on a previous step of the process and not handled by karma preprocessors. In these cases source maps don't get loaded by karma and you lose the advantages of having them.

How it works

This plug-in supports both inline and external source maps.

Inline source maps are located by searching "sourceMappingURL=" inside the javascript file, both plain text and base64-encoded maps are supported.

External source maps are located by appending ".map" to the javascript file name. So if for example you have Hello.js, the preprocessor will try to load source map from Hello.js.map.

Installation

Just write karma-sourcemap-loader as a devDependency in your package.json.

{
  "devDependencies": {
    "karma-sourcemap-loader": "~0.2"
  }
}

Or just issue the following command:

npm install karma-sourcemap-loader --save-dev

Configuration

The code below shows a sample configuration of the preprocessor.

// karma.conf.js
module.exports = function(config) {
  config.set({
    preprocessors: {
      '**/*.js': ['sourcemap']
    }
  });
};

Credits

Thanks to @goldibex for adding inline source maps support.