map.js

if (process.env.npm_package_name === 'pseudomap' &&
    process.env.npm_lifecycle_script === 'test')
  process.env.TEST_PSEUDOMAP = 'true'

if (typeof Map === 'function' && !process.env.TEST_PSEUDOMAP) {
  module.exports = Map
} else {
  module.exports = require('./pseudomap')
}