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    <title>JSDoc: Source: collections/VariableDeclarator.js</title>

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    <h1 class="page-title">Source: collections/VariableDeclarator.js</h1>

    
    <section>
        <article>
            <pre class="prettyprint source linenums"><code>/*
 *  Copyright (c) 2015-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */

'use strict';

var _ = require('lodash');
var Collection = require('../Collection');
var NodeCollection = require('./Node');
var matchNode = require('../matchNode');
var recast = require('recast');

var astNodesAreEquivalent = recast.types.astNodesAreEquivalent;
var b = recast.types.builders;
var types = recast.types.namedTypes;

var VariableDeclarator = recast.types.namedTypes.VariableDeclarator;

/**
* @mixin
*/
var globalMethods = {
  /**
   * Finds all variable declarators, optionally filtered by name.
   *
   * @param {string} name
   * @return {Collection}
   */
  findVariableDeclarators: function(name) {
    var filter = name ? {id: {name: name}} : null;
    return this.find(VariableDeclarator, filter);
  }
};

var filterMethods = {
  /**
   * Returns a function that returns true if the provided path is a variable
   * declarator and requires one of the specified module names.
   *
   * @param {string|Array} names A module name or an array of module names
   * @return {Function}
   */
  requiresModule: function(names) {
    if (names &amp;&amp; !Array.isArray(names)) {
      names = [names];
    }
    var requireIdentifier = b.identifier('require');
    return function(path) {
      var node = path.value;
      if (!VariableDeclarator.check(node) ||
          !types.CallExpression.check(node.init) ||
          !astNodesAreEquivalent(node.init.callee, requireIdentifier)) {
        return false;
      }
      return !names ||
        names.some(
          n => astNodesAreEquivalent(node.init.arguments[0], b.literal(n))
        );
    };
  }
};

/**
* @mixin
*/
var transformMethods = {
  /**
   * Renames a variable and all its occurrences.
   *
   * @param {string} newName
   * @return {Collection}
   */
  renameTo: function(newName) {
    // TODO: Include JSXElements
    return this.forEach(function(path) {
      var node = path.value;
      var oldName = node.id.name;
      var rootScope = path.scope;
      var rootPath = rootScope.path;
      Collection.fromPaths([rootPath])
        .find(types.Identifier, {name: oldName})
        .filter(function(path) { // ignore non-variables
          var parent = path.parent.node;

          if (
            types.MemberExpression.check(parent) &amp;&amp;
            parent.property === path.node &amp;&amp;
            !parent.computed
          ) {
            // obj.oldName
            return false;
          }

          if (
            types.Property.check(parent) &amp;&amp;
            parent.key === path.node &amp;&amp;
            !parent.computed
          ) {
            // { oldName: 3 }
            return false;
          }

          if (
            types.MethodDefinition.check(parent) &amp;&amp;
            parent.key === path.node &amp;&amp;
            !parent.computed
          ) {
            // class A() { oldName() {} }
            return false;
          }

          return true;
        })
        .forEach(function(path) {
          var scope = path.scope;
          while (scope &amp;&amp; scope !== rootScope) {
            if (scope.declares(oldName)) {
              return;
            }
            scope = scope.parent;
          }
          if (scope) { // identifier must refer to declared variable
            path.get('name').replace(newName);
          }
        });
    });
  }
};


function register() {
  NodeCollection.register();
  Collection.registerMethods(globalMethods);
  Collection.registerMethods(transformMethods, VariableDeclarator);
}

exports.register = _.once(register);
exports.filters = filterMethods;
</code></pre>
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