mocha-env-loader.js

//var path = require('path')
var SourceNode = require('source-map').SourceNode
var loaderUtils = require('loader-utils')

module.exports = function(content, map) {
  this.cacheable()

  var sourceNode
  var id = this.options.name

  if (!id) {
    this.callback(null, content, map)
  }

  if (map) {
    sourceNode = SourceNode.fromSourceWithMap(content, map)
  } else {
    var fileName = loaderUtils.getRemainingRequest(this)

    sourceNode = new SourceNode(null, null, null)
    content.split('\n').forEach(function(line, idx) {
      sourceNode.add(new SourceNode(idx + 1, 0, fileName, line + '\n'))
    })
    sourceNode.setSourceContent(fileName, content)
  }

  var concatSrc = new SourceNode()

  concatSrc.add([
    'describe(' + JSON.stringify(id) + ', function() {\n', sourceNode, '\n});'
  ])

  var result = concatSrc.toStringWithSourceMap()

  this.callback(undefined, result.code, result.map.toString())
}