babel-core/lib/babel/detection/index.js

Turn ES6 code into readable vanilla ES5 with source maps

"use strict";

var _interopRequire = function (obj) { return obj && obj.__esModule ? obj["default"] : obj; };

var SYNTAX_KEYS = _interopRequire(require("./syntax-keys"));

var traverse = _interopRequire(require("../traversal"));

var visitors = traverse.explode(require("./visitors"));

module.exports = function (ast) {
  var stats = {
    syntax: {},
    builtins: {}
  };

  var detectedSyntax = function detectedSyntax(name) {
    stats.syntax[name] = true;
  };

  traverse(ast, {
    enter: function enter(node, parent) {
      if (SYNTAX_KEYS[node.type]) {
        detectedSyntax(SYNTAX_KEYS[node.type]);
      }

      var visitor = visitors[node.type];
      if (visitor) visitor(node, parent, detectedSyntax);
    }
  });

  return stats;
};