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-### Esrecurse [![Build Status](https://travis-ci.org/estools/esrecurse.svg?branch=master)](https://travis-ci.org/estools/esrecurse)
-
-Esrecurse ([esrecurse](https://github.com/estools/esrecurse)) is
-[ECMAScript](https://www.ecma-international.org/publications/standards/Ecma-262.htm)
-recursive traversing functionality.
-
-### Example Usage
-
-The following code will output all variables declared at the root of a file.
-
-```javascript
-esrecurse.visit(ast, {
-    XXXStatement: function (node) {
-        this.visit(node.left);
-        // do something...
-        this.visit(node.right);
-    }
-});
-```
-
-We can use `Visitor` instance.
-
-```javascript
-var visitor = new esrecurse.Visitor({
-    XXXStatement: function (node) {
-        this.visit(node.left);
-        // do something...
-        this.visit(node.right);
-    }
-});
-
-visitor.visit(ast);
-```
-
-We can inherit `Visitor` instance easily.
-
-```javascript
-class Derived extends esrecurse.Visitor {
-    constructor()
-    {
-        super(null);
-    }
-
-    XXXStatement(node) {
-    }
-}
-```
-
-```javascript
-function DerivedVisitor() {
-    esrecurse.Visitor.call(/* this for constructor */  this  /* visitor object automatically becomes this. */);
-}
-util.inherits(DerivedVisitor, esrecurse.Visitor);
-DerivedVisitor.prototype.XXXStatement = function (node) {
-    this.visit(node.left);
-    // do something...
-    this.visit(node.right);
-};
-```
-
-And you can invoke default visiting operation inside custom visit operation.
-
-```javascript
-function DerivedVisitor() {
-    esrecurse.Visitor.call(/* this for constructor */  this  /* visitor object automatically becomes this. */);
-}
-util.inherits(DerivedVisitor, esrecurse.Visitor);
-DerivedVisitor.prototype.XXXStatement = function (node) {
-    // do something...
-    this.visitChildren(node);
-};
-```
-
-The `childVisitorKeys` option does customize the behaviour of `this.visitChildren(node)`.
-We can use user-defined node types.
-
-```javascript
-// This tree contains a user-defined `TestExpression` node.
-var tree = {
-    type: 'TestExpression',
-
-    // This 'argument' is the property containing the other **node**.
-    argument: {
-        type: 'Literal',
-        value: 20
-    },
-
-    // This 'extended' is the property not containing the other **node**.
-    extended: true
-};
-esrecurse.visit(
-    ast,
-    {
-        Literal: function (node) {
-            // do something...
-        }
-    },
-    {
-        // Extending the existing traversing rules.
-        childVisitorKeys: {
-            // TargetNodeName: [ 'keys', 'containing', 'the', 'other', '**node**' ]
-            TestExpression: ['argument']
-        }
-    }
-);
-```
-
-We can use the `fallback` option as well.
-If the `fallback` option is `"iteration"`, `esrecurse` would visit all enumerable properties of unknown nodes.
-Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. `node.parent`).
-
-```javascript
-esrecurse.visit(
-    ast,
-    {
-        Literal: function (node) {
-            // do something...
-        }
-    },
-    {
-        fallback: 'iteration'
-    }
-);
-```
-
-If the `fallback` option is a function, `esrecurse` calls this function to determine the enumerable properties of unknown nodes.
-Please note circular references cause the stack overflow. AST might have circular references in additional properties for some purpose (e.g. `node.parent`).
-
-```javascript
-esrecurse.visit(
-    ast,
-    {
-        Literal: function (node) {
-            // do something...
-        }
-    },
-    {
-        fallback: function (node) {
-            return Object.keys(node).filter(function(key) {
-                return key !== 'argument'
-            });
-        }
-    }
-);
-```
-
-### License
-
-Copyright (C) 2014 [Yusuke Suzuki](https://github.com/Constellation)
- (twitter: [@Constellation](https://twitter.com/Constellation)) and other contributors.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-  * Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
-
-  * Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
-THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.