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-### Estraverse [![Build Status](https://secure.travis-ci.org/estools/estraverse.svg)](http://travis-ci.org/estools/estraverse)
-
-Estraverse ([estraverse](http://github.com/estools/estraverse)) is
-[ECMAScript](http://www.ecma-international.org/publications/standards/Ecma-262.htm)
-traversal functions from [esmangle project](http://github.com/estools/esmangle).
-
-### Documentation
-
-You can find usage docs at [wiki page](https://github.com/estools/estraverse/wiki/Usage).
-
-### Example Usage
-
-The following code will output all variables declared at the root of a file.
-
-```javascript
-estraverse.traverse(ast, {
- enter: function (node, parent) {
- if (node.type == 'FunctionExpression' || node.type == 'FunctionDeclaration')
- return estraverse.VisitorOption.Skip;
- },
- leave: function (node, parent) {
- if (node.type == 'VariableDeclarator')
- console.log(node.id.name);
- }
-});
-```
-
-We can use `this.skip`, `this.remove` and `this.break` functions instead of using Skip, Remove and Break.
-
-```javascript
-estraverse.traverse(ast, {
- enter: function (node) {
- this.break();
- }
-});
-```
-
-And estraverse provides `estraverse.replace` function. When returning node from `enter`/`leave`, current node is replaced with it.
-
-```javascript
-result = estraverse.replace(tree, {
- enter: function (node) {
- // Replace it with replaced.
- if (node.type === 'Literal')
- return replaced;
- }
-});
-```
-
-By passing `visitor.keys` mapping, we can extend estraverse traversing functionality.
-
-```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
-};
-estraverse.traverse(tree, {
- enter: function (node) { },
-
- // Extending the existing traversing rules.
- keys: {
- // TargetNodeName: [ 'keys', 'containing', 'the', 'other', '**node**' ]
- TestExpression: ['argument']
- }
-});
-```
-
-By passing `visitor.fallback` option, we can control the behavior when encountering unknown nodes.
-
-```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
-};
-estraverse.traverse(tree, {
- enter: function (node) { },
-
- // Iterating the child **nodes** of unknown nodes.
- fallback: 'iteration'
-});
-```
-
-When `visitor.fallback` is a function, we can determine which keys to visit on each node.
-
-```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
-};
-estraverse.traverse(tree, {
- enter: function (node) { },
-
- // Skip the `argument` property of each node
- fallback: function(node) {
- return Object.keys(node).filter(function(key) {
- return key !== 'argument';
- });
- }
-});
-```
-
-### License
-
-Copyright (C) 2012-2016 [Yusuke Suzuki](http://github.com/Constellation)
- (twitter: [@Constellation](http://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.