2 require('../../modules/es.map');
3 require('../../modules/esnext.map.key-by');
4 var path = require('../../internals/path');
7 var mapKeyBy = Map.keyBy;
9 module.exports = function keyBy(source, iterable, keyDerivative) {
10 return mapKeyBy.call(typeof this === 'function' ? this : Map, source, iterable, keyDerivative);