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The MIT License (MIT)
Copyright (c) 2017, Jon Schlinkert
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# snapdragon-node [![NPM version](https://img.shields.io/npm/v/snapdragon-node.svg?style=flat)](https://www.npmjs.com/package/snapdragon-node) [![NPM monthly downloads](https://img.shields.io/npm/dm/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![NPM total downloads](https://img.shields.io/npm/dt/snapdragon-node.svg?style=flat)](https://npmjs.org/package/snapdragon-node) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/snapdragon-node.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/snapdragon-node)
> Snapdragon utility for creating a new AST node in custom code, such as plugins.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save snapdragon-node
```
## Usage
With [snapdragon](https://github.com/jonschlinkert/snapdragon) v0.9.0 and higher you can use `this.node()` to create a new `Node`, whenever it makes sense.
```js
var Node = require('snapdragon-node');
var Snapdragon = require('snapdragon');
var snapdragon = new Snapdragon();
// example usage inside a parser visitor function
snapdragon.parser.set('foo', function() {
// get the current "start" position
var pos = this.position();
// returns the match if regex matches the substring
// at the current position on `parser.input`
var match = this.match(/foo/);
if (match) {
// call "pos" on the node, to set the start and end
// positions, and return the node to push it onto the AST
// (snapdragon will push the node onto the correct
// nodes array, based on the stack)
return pos(new Node({type: 'bar', val: match[0]}));
}
});
```
## API
### [Node](index.js#L22)
Create a new AST `Node` with the given `val` and `type`.
**Params**
* `val` **{String|Object}**: Pass a matched substring, or an object to merge onto the node.
* `type` **{String}**: The node type to use when `val` is a string.
* `returns` **{Object}**: node instance
**Example**
```js
var node = new Node('*', 'Star');
var node = new Node({type: 'star', val: '*'});
```
### [.isNode](index.js#L61)
Returns true if the given value is a node.
**Params**
* `node` **{Object}**
* `returns` **{Boolean}**
**Example**
```js
var Node = require('snapdragon-node');
var node = new Node({type: 'foo'});
console.log(Node.isNode(node)); //=> true
console.log(Node.isNode({})); //=> false
```
### [.define](index.js#L80)
Define a non-enumberable property on the node instance. Useful for adding properties that shouldn't be extended or visible during debugging.
**Params**
* `name` **{String}**
* `val` **{any}**
* `returns` **{Object}**: returns the node instance
**Example**
```js
var node = new Node();
node.define('foo', 'something non-enumerable');
```
### [.isEmpty](index.js#L100)
Returns true if `node.val` is an empty string, or `node.nodes` does not contain any non-empty text nodes.
**Params**
* `fn` **{Function}**: (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes.
* `returns` **{Boolean}**
**Example**
```js
var node = new Node({type: 'text'});
node.isEmpty(); //=> true
node.val = 'foo';
node.isEmpty(); //=> false
```
### [.push](index.js#L118)
Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
**Params**
* `node` **{Object}**
* `returns` **{Number}**: Returns the length of `node.nodes`
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
foo.push(bar);
```
### [.unshift](index.js#L140)
Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and set `foo` as `bar.parent`.
**Params**
* `node` **{Object}**
* `returns` **{Number}**: Returns the length of `node.nodes`
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
foo.unshift(bar);
```
### [.pop](index.js#L167)
Pop a node from `node.nodes`.
* `returns` **{Number}**: Returns the popped `node`
**Example**
```js
var node = new Node({type: 'foo'});
node.push(new Node({type: 'a'}));
node.push(new Node({type: 'b'}));
node.push(new Node({type: 'c'}));
node.push(new Node({type: 'd'}));
console.log(node.nodes.length);
//=> 4
node.pop();
console.log(node.nodes.length);
//=> 3
```
### [.shift](index.js#L190)
Shift a node from `node.nodes`.
* `returns` **{Object}**: Returns the shifted `node`
**Example**
```js
var node = new Node({type: 'foo'});
node.push(new Node({type: 'a'}));
node.push(new Node({type: 'b'}));
node.push(new Node({type: 'c'}));
node.push(new Node({type: 'd'}));
console.log(node.nodes.length);
//=> 4
node.shift();
console.log(node.nodes.length);
//=> 3
```
### [.remove](index.js#L205)
Remove `node` from `node.nodes`.
**Params**
* `node` **{Object}**
* `returns` **{Object}**: Returns the removed node.
**Example**
```js
node.remove(childNode);
```
### [.find](index.js#L231)
Get the first child node from `node.nodes` that matches the given `type`. If `type` is a number, the child node at that index is returned.
**Params**
* `type` **{String}**
* `returns` **{Object}**: Returns a child node or undefined.
**Example**
```js
var child = node.find(1); //<= index of the node to get
var child = node.find('foo'); //<= node.type of a child node
var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
var child = node.find(['foo', 'bar']); //<= array of node.type(s)
```
### [.isType](index.js#L249)
Return true if the node is the given `type`.
**Params**
* `type` **{String}**
* `returns` **{Boolean}**
**Example**
```js
var node = new Node({type: 'bar'});
cosole.log(node.isType('foo')); // false
cosole.log(node.isType(/^(foo|bar)$/)); // true
cosole.log(node.isType(['foo', 'bar'])); // true
```
### [.hasType](index.js#L270)
Return true if the `node.nodes` has the given `type`.
**Params**
* `type` **{String}**
* `returns` **{Boolean}**
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
foo.push(bar);
cosole.log(foo.hasType('qux')); // false
cosole.log(foo.hasType(/^(qux|bar)$/)); // true
cosole.log(foo.hasType(['qux', 'bar'])); // true
```
* `returns` **{Array}**
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
foo.push(bar);
foo.push(baz);
console.log(bar.siblings.length) // 2
console.log(baz.siblings.length) // 2
```
* `returns` **{Number}**
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
var qux = new Node({type: 'qux'});
foo.push(bar);
foo.push(baz);
foo.unshift(qux);
console.log(bar.index) // 1
console.log(baz.index) // 2
console.log(qux.index) // 0
```
* `returns` **{Object}**
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
foo.push(bar);
foo.push(baz);
console.log(baz.prev.type) // 'bar'
```
* `returns` **{Object}**
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
foo.push(bar);
foo.push(baz);
console.log(bar.siblings.length) // 2
console.log(baz.siblings.length) // 2
```
* `returns` **{Object}**: The first node, or undefiend
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
var qux = new Node({type: 'qux'});
foo.push(bar);
foo.push(baz);
foo.push(qux);
console.log(foo.first.type) // 'bar'
```
* `returns` **{Object}**: The last node, or undefiend
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
var qux = new Node({type: 'qux'});
foo.push(bar);
foo.push(baz);
foo.push(qux);
console.log(foo.last.type) // 'qux'
```
* `returns` **{Object}**: The last node, or undefiend
**Example**
```js
var foo = new Node({type: 'foo'});
var bar = new Node({type: 'bar'});
var baz = new Node({type: 'baz'});
var qux = new Node({type: 'qux'});
foo.push(bar);
foo.push(baz);
foo.push(qux);
console.log(foo.last.type) // 'qux'
```
## Release history
Changelog entries are classified using the following labels from [keep-a-changelog](https://github.com/olivierlacan/keep-a-changelog):
* `added`: for new features
* `changed`: for changes in existing functionality
* `deprecated`: for once-stable features removed in upcoming releases
* `removed`: for deprecated features removed in this release
* `fixed`: for any bug fixes
Custom labels used in this changelog:
* `dependencies`: bumps dependencies
* `housekeeping`: code re-organization, minor edits, or other changes that don't fit in one of the other categories.
### [2.0.0] - 2017-05-01
**Changed**
* `.unshiftNode` was renamed to [.unshift](#unshift)
* `.pushNode` was renamed to [.push](#push)
* `.getNode` was renamed to [.find](#find)
**Added**
* [.isNode](#isNode)
* [.isEmpty](#isEmpty)
* [.pop](#pop)
* [.shift](#shift)
* [.remove](#remove)
### [0.1.0]
First release.
## About
### Related projects
* [breakdance](https://www.npmjs.com/package/breakdance): Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy… [more](http://breakdance.io) | [homepage](http://breakdance.io "Breakdance is a node.js library for converting HTML to markdown. Highly pluggable, flexible and easy to use. It's time for your markup to get down.")
* [snapdragon-capture](https://www.npmjs.com/package/snapdragon-capture): Snapdragon plugin that adds a capture method to the parser instance. | [homepage](https://github.com/jonschlinkert/snapdragon-capture "Snapdragon plugin that adds a capture method to the parser instance.")
* [snapdragon-cheerio](https://www.npmjs.com/package/snapdragon-cheerio): Snapdragon plugin for converting a cheerio AST to a snapdragon AST. | [homepage](https://github.com/jonschlinkert/snapdragon-cheerio "Snapdragon plugin for converting a cheerio AST to a snapdragon AST.")
* [snapdragon-util](https://www.npmjs.com/package/snapdragon-util): Utilities for the snapdragon parser/compiler. | [homepage](https://github.com/jonschlinkert/snapdragon-util "Utilities for the snapdragon parser/compiler.")
* [snapdragon](https://www.npmjs.com/package/snapdragon): Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map… [more](https://github.com/jonschlinkert/snapdragon) | [homepage](https://github.com/jonschlinkert/snapdragon "Easy-to-use plugin system for creating powerful, fast and versatile parsers and compilers, with built-in source-map support.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
Please read the [contributing guide](.github/contributing.md) for advice on opening issues, pull requests, and coding standards.
### Building docs
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
### Running tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on June 25, 2017._

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'use strict';
var isObject = require('isobject');
var define = require('define-property');
var utils = require('snapdragon-util');
var ownNames;
/**
* Create a new AST `Node` with the given `val` and `type`.
*
* ```js
* var node = new Node('*', 'Star');
* var node = new Node({type: 'star', val: '*'});
* ```
* @name Node
* @param {String|Object} `val` Pass a matched substring, or an object to merge onto the node.
* @param {String} `type` The node type to use when `val` is a string.
* @return {Object} node instance
* @api public
*/
function Node(val, type, parent) {
if (typeof type !== 'string') {
parent = type;
type = null;
}
define(this, 'parent', parent);
define(this, 'isNode', true);
define(this, 'expect', null);
if (typeof type !== 'string' && isObject(val)) {
lazyKeys();
var keys = Object.keys(val);
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
if (ownNames.indexOf(key) === -1) {
this[key] = val[key];
}
}
} else {
this.type = type;
this.val = val;
}
}
/**
* Returns true if the given value is a node.
*
* ```js
* var Node = require('snapdragon-node');
* var node = new Node({type: 'foo'});
* console.log(Node.isNode(node)); //=> true
* console.log(Node.isNode({})); //=> false
* ```
* @param {Object} `node`
* @returns {Boolean}
* @api public
*/
Node.isNode = function(node) {
return utils.isNode(node);
};
/**
* Define a non-enumberable property on the node instance.
* Useful for adding properties that shouldn't be extended
* or visible during debugging.
*
* ```js
* var node = new Node();
* node.define('foo', 'something non-enumerable');
* ```
* @param {String} `name`
* @param {any} `val`
* @return {Object} returns the node instance
* @api public
*/
Node.prototype.define = function(name, val) {
define(this, name, val);
return this;
};
/**
* Returns true if `node.val` is an empty string, or `node.nodes` does
* not contain any non-empty text nodes.
*
* ```js
* var node = new Node({type: 'text'});
* node.isEmpty(); //=> true
* node.val = 'foo';
* node.isEmpty(); //=> false
* ```
* @param {Function} `fn` (optional) Filter function that is called on `node` and/or child nodes. `isEmpty` will return false immediately when the filter function returns false on any nodes.
* @return {Boolean}
* @api public
*/
Node.prototype.isEmpty = function(fn) {
return utils.isEmpty(this, fn);
};
/**
* Given node `foo` and node `bar`, push node `bar` onto `foo.nodes`, and
* set `foo` as `bar.parent`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* foo.push(bar);
* ```
* @param {Object} `node`
* @return {Number} Returns the length of `node.nodes`
* @api public
*/
Node.prototype.push = function(node) {
assert(Node.isNode(node), 'expected node to be an instance of Node');
define(node, 'parent', this);
this.nodes = this.nodes || [];
return this.nodes.push(node);
};
/**
* Given node `foo` and node `bar`, unshift node `bar` onto `foo.nodes`, and
* set `foo` as `bar.parent`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* foo.unshift(bar);
* ```
* @param {Object} `node`
* @return {Number} Returns the length of `node.nodes`
* @api public
*/
Node.prototype.unshift = function(node) {
assert(Node.isNode(node), 'expected node to be an instance of Node');
define(node, 'parent', this);
this.nodes = this.nodes || [];
return this.nodes.unshift(node);
};
/**
* Pop a node from `node.nodes`.
*
* ```js
* var node = new Node({type: 'foo'});
* node.push(new Node({type: 'a'}));
* node.push(new Node({type: 'b'}));
* node.push(new Node({type: 'c'}));
* node.push(new Node({type: 'd'}));
* console.log(node.nodes.length);
* //=> 4
* node.pop();
* console.log(node.nodes.length);
* //=> 3
* ```
* @return {Number} Returns the popped `node`
* @api public
*/
Node.prototype.pop = function() {
return this.nodes && this.nodes.pop();
};
/**
* Shift a node from `node.nodes`.
*
* ```js
* var node = new Node({type: 'foo'});
* node.push(new Node({type: 'a'}));
* node.push(new Node({type: 'b'}));
* node.push(new Node({type: 'c'}));
* node.push(new Node({type: 'd'}));
* console.log(node.nodes.length);
* //=> 4
* node.shift();
* console.log(node.nodes.length);
* //=> 3
* ```
* @return {Object} Returns the shifted `node`
* @api public
*/
Node.prototype.shift = function() {
return this.nodes && this.nodes.shift();
};
/**
* Remove `node` from `node.nodes`.
*
* ```js
* node.remove(childNode);
* ```
* @param {Object} `node`
* @return {Object} Returns the removed node.
* @api public
*/
Node.prototype.remove = function(node) {
assert(Node.isNode(node), 'expected node to be an instance of Node');
this.nodes = this.nodes || [];
var idx = node.index;
if (idx !== -1) {
node.index = -1;
return this.nodes.splice(idx, 1);
}
return null;
};
/**
* Get the first child node from `node.nodes` that matches the given `type`.
* If `type` is a number, the child node at that index is returned.
*
* ```js
* var child = node.find(1); //<= index of the node to get
* var child = node.find('foo'); //<= node.type of a child node
* var child = node.find(/^(foo|bar)$/); //<= regex to match node.type
* var child = node.find(['foo', 'bar']); //<= array of node.type(s)
* ```
* @param {String} `type`
* @return {Object} Returns a child node or undefined.
* @api public
*/
Node.prototype.find = function(type) {
return utils.findNode(this.nodes, type);
};
/**
* Return true if the node is the given `type`.
*
* ```js
* var node = new Node({type: 'bar'});
* cosole.log(node.isType('foo')); // false
* cosole.log(node.isType(/^(foo|bar)$/)); // true
* cosole.log(node.isType(['foo', 'bar'])); // true
* ```
* @param {String} `type`
* @return {Boolean}
* @api public
*/
Node.prototype.isType = function(type) {
return utils.isType(this, type);
};
/**
* Return true if the `node.nodes` has the given `type`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* foo.push(bar);
*
* cosole.log(foo.hasType('qux')); // false
* cosole.log(foo.hasType(/^(qux|bar)$/)); // true
* cosole.log(foo.hasType(['qux', 'bar'])); // true
* ```
* @param {String} `type`
* @return {Boolean}
* @api public
*/
Node.prototype.hasType = function(type) {
return utils.hasType(this, type);
};
/**
* Get the siblings array, or `null` if it doesn't exist.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* foo.push(bar);
* foo.push(baz);
*
* console.log(bar.siblings.length) // 2
* console.log(baz.siblings.length) // 2
* ```
* @return {Array}
* @api public
*/
Object.defineProperty(Node.prototype, 'siblings', {
set: function() {
throw new Error('node.siblings is a getter and cannot be defined');
},
get: function() {
return this.parent ? this.parent.nodes : null;
}
});
/**
* Get the node's current index from `node.parent.nodes`.
* This should always be correct, even when the parent adds nodes.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* var qux = new Node({type: 'qux'});
* foo.push(bar);
* foo.push(baz);
* foo.unshift(qux);
*
* console.log(bar.index) // 1
* console.log(baz.index) // 2
* console.log(qux.index) // 0
* ```
* @return {Number}
* @api public
*/
Object.defineProperty(Node.prototype, 'index', {
set: function(index) {
define(this, 'idx', index);
},
get: function() {
if (!Array.isArray(this.siblings)) {
return -1;
}
var tok = this.idx !== -1 ? this.siblings[this.idx] : null;
if (tok !== this) {
this.idx = this.siblings.indexOf(this);
}
return this.idx;
}
});
/**
* Get the previous node from the siblings array or `null`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* foo.push(bar);
* foo.push(baz);
*
* console.log(baz.prev.type) // 'bar'
* ```
* @return {Object}
* @api public
*/
Object.defineProperty(Node.prototype, 'prev', {
set: function() {
throw new Error('node.prev is a getter and cannot be defined');
},
get: function() {
if (Array.isArray(this.siblings)) {
return this.siblings[this.index - 1] || this.parent.prev;
}
return null;
}
});
/**
* Get the siblings array, or `null` if it doesn't exist.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* foo.push(bar);
* foo.push(baz);
*
* console.log(bar.siblings.length) // 2
* console.log(baz.siblings.length) // 2
* ```
* @return {Object}
* @api public
*/
Object.defineProperty(Node.prototype, 'next', {
set: function() {
throw new Error('node.next is a getter and cannot be defined');
},
get: function() {
if (Array.isArray(this.siblings)) {
return this.siblings[this.index + 1] || this.parent.next;
}
return null;
}
});
/**
* Get the first node from `node.nodes`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* var qux = new Node({type: 'qux'});
* foo.push(bar);
* foo.push(baz);
* foo.push(qux);
*
* console.log(foo.first.type) // 'bar'
* ```
* @return {Object} The first node, or undefiend
* @api public
*/
Object.defineProperty(Node.prototype, 'first', {
get: function() {
return this.nodes ? this.nodes[0] : null;
}
});
/**
* Get the last node from `node.nodes`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* var qux = new Node({type: 'qux'});
* foo.push(bar);
* foo.push(baz);
* foo.push(qux);
*
* console.log(foo.last.type) // 'qux'
* ```
* @return {Object} The last node, or undefiend
* @api public
*/
Object.defineProperty(Node.prototype, 'last', {
get: function() {
return this.nodes ? utils.last(this.nodes) : null;
}
});
/**
* Get the last node from `node.nodes`.
*
* ```js
* var foo = new Node({type: 'foo'});
* var bar = new Node({type: 'bar'});
* var baz = new Node({type: 'baz'});
* var qux = new Node({type: 'qux'});
* foo.push(bar);
* foo.push(baz);
* foo.push(qux);
*
* console.log(foo.last.type) // 'qux'
* ```
* @return {Object} The last node, or undefiend
* @api public
*/
Object.defineProperty(Node.prototype, 'scope', {
get: function() {
if (this.isScope !== true) {
return this.parent ? this.parent.scope : this;
}
return this;
}
});
/**
* Get own property names from Node prototype, but only the
* first time `Node` is instantiated
*/
function lazyKeys() {
if (!ownNames) {
ownNames = Object.getOwnPropertyNames(Node.prototype);
}
}
/**
* Simplified assertion. Throws an error is `val` is falsey.
*/
function assert(val, message) {
if (!val) throw new Error(message);
}
/**
* Expose `Node`
*/
exports = module.exports = Node;

21
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@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright (c) 2015, 2017, Jon Schlinkert
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

95
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# define-property [![NPM version](https://img.shields.io/npm/v/define-property.svg?style=flat)](https://www.npmjs.com/package/define-property) [![NPM monthly downloads](https://img.shields.io/npm/dm/define-property.svg?style=flat)](https://npmjs.org/package/define-property) [![NPM total downloads](https://img.shields.io/npm/dt/define-property.svg?style=flat)](https://npmjs.org/package/define-property) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/define-property.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/define-property)
> Define a non-enumerable property on an object.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save define-property
```
Install with [yarn](https://yarnpkg.com):
```sh
$ yarn add define-property
```
## Usage
**Params**
* `obj`: The object on which to define the property.
* `prop`: The name of the property to be defined or modified.
* `descriptor`: The descriptor for the property being defined or modified.
```js
var define = require('define-property');
var obj = {};
define(obj, 'foo', function(val) {
return val.toUpperCase();
});
console.log(obj);
//=> {}
console.log(obj.foo('bar'));
//=> 'BAR'
```
**get/set**
```js
define(obj, 'foo', {
get: function() {},
set: function() {}
});
```
## About
### Related projects
* [assign-deep](https://www.npmjs.com/package/assign-deep): Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… [more](https://github.com/jonschlinkert/assign-deep) | [homepage](https://github.com/jonschlinkert/assign-deep "Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target (first) object.")
* [extend-shallow](https://www.npmjs.com/package/extend-shallow): Extend an object with the properties of additional objects. node.js/javascript util. | [homepage](https://github.com/jonschlinkert/extend-shallow "Extend an object with the properties of additional objects. node.js/javascript util.")
* [merge-deep](https://www.npmjs.com/package/merge-deep): Recursively merge values in a javascript object. | [homepage](https://github.com/jonschlinkert/merge-deep "Recursively merge values in a javascript object.")
* [mixin-deep](https://www.npmjs.com/package/mixin-deep): Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone. | [homepage](https://github.com/jonschlinkert/mixin-deep "Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### Building docs
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
### Running tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.5.0, on April 20, 2017._

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/*!
* define-property <https://github.com/jonschlinkert/define-property>
*
* Copyright (c) 2015, 2017, Jon Schlinkert.
* Released under the MIT License.
*/
'use strict';
var isDescriptor = require('is-descriptor');
module.exports = function defineProperty(obj, prop, val) {
if (typeof obj !== 'object' && typeof obj !== 'function') {
throw new TypeError('expected an object or function.');
}
if (typeof prop !== 'string') {
throw new TypeError('expected `prop` to be a string.');
}
if (isDescriptor(val) && ('set' in val || 'get' in val)) {
return Object.defineProperty(obj, prop, val);
}
return Object.defineProperty(obj, prop, {
configurable: true,
enumerable: false,
writable: true,
value: val
});
};

66
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@ -0,0 +1,66 @@
{
"name": "define-property",
"description": "Define a non-enumerable property on an object.",
"version": "1.0.0",
"homepage": "https://github.com/jonschlinkert/define-property",
"author": "Jon Schlinkert (https://github.com/jonschlinkert)",
"repository": "jonschlinkert/define-property",
"bugs": {
"url": "https://github.com/jonschlinkert/define-property/issues"
},
"license": "MIT",
"files": [
"index.js"
],
"main": "index.js",
"engines": {
"node": ">=0.10.0"
},
"scripts": {
"test": "mocha"
},
"dependencies": {
"is-descriptor": "^1.0.0"
},
"devDependencies": {
"gulp-format-md": "^0.1.12",
"mocha": "^3.2.0"
},
"keywords": [
"define",
"define-property",
"enumerable",
"key",
"non",
"non-enumerable",
"object",
"prop",
"property",
"value"
],
"verb": {
"related": {
"list": [
"extend-shallow",
"merge-deep",
"assign-deep",
"mixin-deep"
]
},
"toc": false,
"layout": "default",
"tasks": [
"readme"
],
"plugins": [
"gulp-format-md"
],
"lint": {
"reflinks": true
}
}
,"_resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz"
,"_integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY="
,"_from": "define-property@1.0.0"
}

21
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@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright (c) 2015-2017, Jon Schlinkert.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

144
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@ -0,0 +1,144 @@
# is-accessor-descriptor [![NPM version](https://img.shields.io/npm/v/is-accessor-descriptor.svg?style=flat)](https://www.npmjs.com/package/is-accessor-descriptor) [![NPM monthly downloads](https://img.shields.io/npm/dm/is-accessor-descriptor.svg?style=flat)](https://npmjs.org/package/is-accessor-descriptor) [![NPM total downloads](https://img.shields.io/npm/dt/is-accessor-descriptor.svg?style=flat)](https://npmjs.org/package/is-accessor-descriptor) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/is-accessor-descriptor.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/is-accessor-descriptor)
> Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save is-accessor-descriptor
```
## Usage
```js
var isAccessor = require('is-accessor-descriptor');
isAccessor({get: function() {}});
//=> true
```
You may also pass an object and property name to check if the property is an accessor:
```js
isAccessor(foo, 'bar');
```
## Examples
`false` when not an object
```js
isAccessor('a')
isAccessor(null)
isAccessor([])
//=> false
```
`true` when the object has valid properties
and the properties all have the correct JavaScript types:
```js
isAccessor({get: noop, set: noop})
isAccessor({get: noop})
isAccessor({set: noop})
//=> true
```
`false` when the object has invalid properties
```js
isAccessor({get: noop, set: noop, bar: 'baz'})
isAccessor({get: noop, writable: true})
isAccessor({get: noop, value: true})
//=> false
```
`false` when an accessor is not a function
```js
isAccessor({get: noop, set: 'baz'})
isAccessor({get: 'foo', set: noop})
isAccessor({get: 'foo', bar: 'baz'})
isAccessor({get: 'foo', set: 'baz'})
//=> false
```
`false` when a value is not the correct type
```js
isAccessor({get: noop, set: noop, enumerable: 'foo'})
isAccessor({set: noop, configurable: 'foo'})
isAccessor({get: noop, configurable: 'foo'})
//=> false
```
## About
<details>
<summary><strong>Contributing</strong></summary>
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
</details>
<details>
<summary><strong>Running Tests</strong></summary>
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
</details>
<details>
<summary><strong>Building docs</strong></summary>
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
</details>
### Related projects
You might also be interested in these projects:
* [is-accessor-descriptor](https://www.npmjs.com/package/is-accessor-descriptor): Returns true if a value has the characteristics of a valid JavaScript accessor descriptor. | [homepage](https://github.com/jonschlinkert/is-accessor-descriptor "Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.")
* [is-data-descriptor](https://www.npmjs.com/package/is-data-descriptor): Returns true if a value has the characteristics of a valid JavaScript data descriptor. | [homepage](https://github.com/jonschlinkert/is-data-descriptor "Returns true if a value has the characteristics of a valid JavaScript data descriptor.")
* [is-descriptor](https://www.npmjs.com/package/is-descriptor): Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for… [more](https://github.com/jonschlinkert/is-descriptor) | [homepage](https://github.com/jonschlinkert/is-descriptor "Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.")
* [is-plain-object](https://www.npmjs.com/package/is-plain-object): Returns true if an object was created by the `Object` constructor. | [homepage](https://github.com/jonschlinkert/is-plain-object "Returns true if an object was created by the `Object` constructor.")
* [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.")
### Contributors
| **Commits** | **Contributor** |
| --- | --- |
| 22 | [jonschlinkert](https://github.com/jonschlinkert) |
| 2 | [realityking](https://github.com/realityking) |
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on November 01, 2017._

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/*!
* is-accessor-descriptor <https://github.com/jonschlinkert/is-accessor-descriptor>
*
* Copyright (c) 2015-2017, Jon Schlinkert.
* Released under the MIT License.
*/
'use strict';
var typeOf = require('kind-of');
// accessor descriptor properties
var accessor = {
get: 'function',
set: 'function',
configurable: 'boolean',
enumerable: 'boolean'
};
function isAccessorDescriptor(obj, prop) {
if (typeof prop === 'string') {
var val = Object.getOwnPropertyDescriptor(obj, prop);
return typeof val !== 'undefined';
}
if (typeOf(obj) !== 'object') {
return false;
}
if (has(obj, 'value') || has(obj, 'writable')) {
return false;
}
if (!has(obj, 'get') || typeof obj.get !== 'function') {
return false;
}
// tldr: it's valid to have "set" be undefined
// "set" might be undefined if `Object.getOwnPropertyDescriptor`
// was used to get the value, and only `get` was defined by the user
if (has(obj, 'set') && typeof obj[key] !== 'function' && typeof obj[key] !== 'undefined') {
return false;
}
for (var key in obj) {
if (!accessor.hasOwnProperty(key)) {
continue;
}
if (typeOf(obj[key]) === accessor[key]) {
continue;
}
if (typeof obj[key] !== 'undefined') {
return false;
}
}
return true;
}
function has(obj, key) {
return {}.hasOwnProperty.call(obj, key);
}
/**
* Expose `isAccessorDescriptor`
*/
module.exports = isAccessorDescriptor;

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@ -0,0 +1,77 @@
{
"name": "is-accessor-descriptor",
"description": "Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.",
"version": "1.0.0",
"homepage": "https://github.com/jonschlinkert/is-accessor-descriptor",
"author": "Jon Schlinkert (https://github.com/jonschlinkert)",
"contributors": [
"Jon Schlinkert (http://twitter.com/jonschlinkert)",
"Rouven Weßling (www.rouvenwessling.de)"
],
"repository": "jonschlinkert/is-accessor-descriptor",
"bugs": {
"url": "https://github.com/jonschlinkert/is-accessor-descriptor/issues"
},
"license": "MIT",
"files": [
"index.js"
],
"main": "index.js",
"engines": {
"node": ">=0.10.0"
},
"scripts": {
"test": "mocha"
},
"dependencies": {
"kind-of": "^6.0.0"
},
"devDependencies": {
"gulp-format-md": "^1.0.0",
"mocha": "^3.5.3"
},
"keywords": [
"accessor",
"check",
"data",
"descriptor",
"get",
"getter",
"is",
"keys",
"object",
"properties",
"property",
"set",
"setter",
"type",
"valid",
"value"
],
"verb": {
"toc": false,
"layout": "default",
"tasks": [
"readme"
],
"plugins": [
"gulp-format-md"
],
"related": {
"list": [
"is-accessor-descriptor",
"is-data-descriptor",
"is-descriptor",
"is-plain-object",
"isobject"
]
},
"lint": {
"reflinks": true
}
}
,"_resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz"
,"_integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ=="
,"_from": "is-accessor-descriptor@1.0.0"
}

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@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright (c) 2015-2017, Jon Schlinkert.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

161
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@ -0,0 +1,161 @@
# is-data-descriptor [![NPM version](https://img.shields.io/npm/v/is-data-descriptor.svg?style=flat)](https://www.npmjs.com/package/is-data-descriptor) [![NPM monthly downloads](https://img.shields.io/npm/dm/is-data-descriptor.svg?style=flat)](https://npmjs.org/package/is-data-descriptor) [![NPM total downloads](https://img.shields.io/npm/dt/is-data-descriptor.svg?style=flat)](https://npmjs.org/package/is-data-descriptor) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/is-data-descriptor.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/is-data-descriptor)
> Returns true if a value has the characteristics of a valid JavaScript data descriptor.
Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save is-data-descriptor
```
## Usage
```js
var isDataDesc = require('is-data-descriptor');
```
## Examples
`true` when the descriptor has valid properties with valid values.
```js
// `value` can be anything
isDataDesc({value: 'foo'})
isDataDesc({value: function() {}})
isDataDesc({value: true})
//=> true
```
`false` when not an object
```js
isDataDesc('a')
//=> false
isDataDesc(null)
//=> false
isDataDesc([])
//=> false
```
`false` when the object has invalid properties
```js
isDataDesc({value: 'foo', bar: 'baz'})
//=> false
isDataDesc({value: 'foo', bar: 'baz'})
//=> false
isDataDesc({value: 'foo', get: function(){}})
//=> false
isDataDesc({get: function(){}, value: 'foo'})
//=> false
```
`false` when a value is not the correct type
```js
isDataDesc({value: 'foo', enumerable: 'foo'})
//=> false
isDataDesc({value: 'foo', configurable: 'foo'})
//=> false
isDataDesc({value: 'foo', writable: 'foo'})
//=> false
```
## Valid properties
The only valid data descriptor properties are the following:
* `configurable` (required)
* `enumerable` (required)
* `value` (optional)
* `writable` (optional)
To be a valid data descriptor, either `value` or `writable` must be defined.
**Invalid properties**
A descriptor may have additional _invalid_ properties (an error will **not** be thrown).
```js
var foo = {};
Object.defineProperty(foo, 'bar', {
enumerable: true,
whatever: 'blah', // invalid, but doesn't cause an error
get: function() {
return 'baz';
}
});
console.log(foo.bar);
//=> 'baz'
```
## About
<details>
<summary><strong>Contributing</strong></summary>
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
</details>
<details>
<summary><strong>Running Tests</strong></summary>
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
</details>
<details>
<summary><strong>Building docs</strong></summary>
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
</details>
### Related projects
You might also be interested in these projects:
* [is-accessor-descriptor](https://www.npmjs.com/package/is-accessor-descriptor): Returns true if a value has the characteristics of a valid JavaScript accessor descriptor. | [homepage](https://github.com/jonschlinkert/is-accessor-descriptor "Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.")
* [is-data-descriptor](https://www.npmjs.com/package/is-data-descriptor): Returns true if a value has the characteristics of a valid JavaScript data descriptor. | [homepage](https://github.com/jonschlinkert/is-data-descriptor "Returns true if a value has the characteristics of a valid JavaScript data descriptor.")
* [is-descriptor](https://www.npmjs.com/package/is-descriptor): Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for… [more](https://github.com/jonschlinkert/is-descriptor) | [homepage](https://github.com/jonschlinkert/is-descriptor "Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.")
* [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.")
### Contributors
| **Commits** | **Contributor** |
| --- | --- |
| 21 | [jonschlinkert](https://github.com/jonschlinkert) |
| 2 | [realityking](https://github.com/realityking) |
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on November 01, 2017._

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/*!
* is-data-descriptor <https://github.com/jonschlinkert/is-data-descriptor>
*
* Copyright (c) 2015-2017, Jon Schlinkert.
* Released under the MIT License.
*/
'use strict';
var typeOf = require('kind-of');
module.exports = function isDataDescriptor(obj, prop) {
// data descriptor properties
var data = {
configurable: 'boolean',
enumerable: 'boolean',
writable: 'boolean'
};
if (typeOf(obj) !== 'object') {
return false;
}
if (typeof prop === 'string') {
var val = Object.getOwnPropertyDescriptor(obj, prop);
return typeof val !== 'undefined';
}
if (!('value' in obj) && !('writable' in obj)) {
return false;
}
for (var key in obj) {
if (key === 'value') continue;
if (!data.hasOwnProperty(key)) {
continue;
}
if (typeOf(obj[key]) === data[key]) {
continue;
}
if (typeof obj[key] !== 'undefined') {
return false;
}
}
return true;
};

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{
"name": "is-data-descriptor",
"description": "Returns true if a value has the characteristics of a valid JavaScript data descriptor.",
"version": "1.0.0",
"homepage": "https://github.com/jonschlinkert/is-data-descriptor",
"author": "Jon Schlinkert (https://github.com/jonschlinkert)",
"contributors": [
"Jon Schlinkert (http://twitter.com/jonschlinkert)",
"Rouven Weßling (www.rouvenwessling.de)"
],
"repository": "jonschlinkert/is-data-descriptor",
"bugs": {
"url": "https://github.com/jonschlinkert/is-data-descriptor/issues"
},
"license": "MIT",
"files": [
"index.js"
],
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},
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"accessor",
"check",
"data",
"descriptor",
"get",
"getter",
"is",
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"property",
"set",
"setter",
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"value"
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"readme"
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,"_from": "is-data-descriptor@1.0.0"
}

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The MIT License (MIT)
Copyright (c) 2015-2017, Jon Schlinkert.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

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# is-descriptor [![NPM version](https://img.shields.io/npm/v/is-descriptor.svg?style=flat)](https://www.npmjs.com/package/is-descriptor) [![NPM monthly downloads](https://img.shields.io/npm/dm/is-descriptor.svg?style=flat)](https://npmjs.org/package/is-descriptor) [![NPM total downloads](https://img.shields.io/npm/dt/is-descriptor.svg?style=flat)](https://npmjs.org/package/is-descriptor) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/is-descriptor.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/is-descriptor)
> Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
## Install
Install with [npm](https://www.npmjs.com/):
```sh
$ npm install --save is-descriptor
```
## Usage
```js
var isDescriptor = require('is-descriptor');
isDescriptor({value: 'foo'})
//=> true
isDescriptor({get: function(){}, set: function(){}})
//=> true
isDescriptor({get: 'foo', set: function(){}})
//=> false
```
You may also check for a descriptor by passing an object as the first argument and property name (`string`) as the second argument.
```js
var obj = {};
obj.foo = 'abc';
Object.defineProperty(obj, 'bar', {
value: 'xyz'
});
isDescriptor(obj, 'foo');
//=> true
isDescriptor(obj, 'bar');
//=> true
```
## Examples
### value type
`false` when not an object
```js
isDescriptor('a');
//=> false
isDescriptor(null);
//=> false
isDescriptor([]);
//=> false
```
### data descriptor
`true` when the object has valid properties with valid values.
```js
isDescriptor({value: 'foo'});
//=> true
isDescriptor({value: noop});
//=> true
```
`false` when the object has invalid properties
```js
isDescriptor({value: 'foo', bar: 'baz'});
//=> false
isDescriptor({value: 'foo', bar: 'baz'});
//=> false
isDescriptor({value: 'foo', get: noop});
//=> false
isDescriptor({get: noop, value: noop});
//=> false
```
`false` when a value is not the correct type
```js
isDescriptor({value: 'foo', enumerable: 'foo'});
//=> false
isDescriptor({value: 'foo', configurable: 'foo'});
//=> false
isDescriptor({value: 'foo', writable: 'foo'});
//=> false
```
### accessor descriptor
`true` when the object has valid properties with valid values.
```js
isDescriptor({get: noop, set: noop});
//=> true
isDescriptor({get: noop});
//=> true
isDescriptor({set: noop});
//=> true
```
`false` when the object has invalid properties
```js
isDescriptor({get: noop, set: noop, bar: 'baz'});
//=> false
isDescriptor({get: noop, writable: true});
//=> false
isDescriptor({get: noop, value: true});
//=> false
```
`false` when an accessor is not a function
```js
isDescriptor({get: noop, set: 'baz'});
//=> false
isDescriptor({get: 'foo', set: noop});
//=> false
isDescriptor({get: 'foo', bar: 'baz'});
//=> false
isDescriptor({get: 'foo', set: 'baz'});
//=> false
```
`false` when a value is not the correct type
```js
isDescriptor({get: noop, set: noop, enumerable: 'foo'});
//=> false
isDescriptor({set: noop, configurable: 'foo'});
//=> false
isDescriptor({get: noop, configurable: 'foo'});
//=> false
```
## About
### Related projects
* [is-accessor-descriptor](https://www.npmjs.com/package/is-accessor-descriptor): Returns true if a value has the characteristics of a valid JavaScript accessor descriptor. | [homepage](https://github.com/jonschlinkert/is-accessor-descriptor "Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.")
* [is-data-descriptor](https://www.npmjs.com/package/is-data-descriptor): Returns true if a value has the characteristics of a valid JavaScript data descriptor. | [homepage](https://github.com/jonschlinkert/is-data-descriptor "Returns true if a value has the characteristics of a valid JavaScript data descriptor.")
* [is-descriptor](https://www.npmjs.com/package/is-descriptor): Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for… [more](https://github.com/jonschlinkert/is-descriptor) | [homepage](https://github.com/jonschlinkert/is-descriptor "Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.")
* [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.")
### Contributing
Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
### Contributors
| **Commits** | **Contributor** |
| --- | --- |
| 24 | [jonschlinkert](https://github.com/jonschlinkert) |
| 1 | [doowb](https://github.com/doowb) |
| 1 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
### Building docs
_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
To generate the readme, run the following command:
```sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb
```
### Running tests
Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
```sh
$ npm install && npm test
```
### Author
**Jon Schlinkert**
* [github/jonschlinkert](https://github.com/jonschlinkert)
* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
### License
Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
Released under the [MIT License](LICENSE).
***
_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 22, 2017._

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/*!
* is-descriptor <https://github.com/jonschlinkert/is-descriptor>
*
* Copyright (c) 2015-2017, Jon Schlinkert.
* Released under the MIT License.
*/
'use strict';
var typeOf = require('kind-of');
var isAccessor = require('is-accessor-descriptor');
var isData = require('is-data-descriptor');
module.exports = function isDescriptor(obj, key) {
if (typeOf(obj) !== 'object') {
return false;
}
if ('get' in obj) {
return isAccessor(obj, key);
}
return isData(obj, key);
};

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{
"name": "is-descriptor",
"description": "Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.",
"version": "1.0.2",
"homepage": "https://github.com/jonschlinkert/is-descriptor",
"author": "Jon Schlinkert (https://github.com/jonschlinkert)",
"contributors": [
"Brian Woodward (https://twitter.com/doowb)",
"Jon Schlinkert (http://twitter.com/jonschlinkert)",
"(https://github.com/wtgtybhertgeghgtwtg)"
],
"repository": "jonschlinkert/is-descriptor",
"bugs": {
"url": "https://github.com/jonschlinkert/is-descriptor/issues"
},
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"setter",
"type",
"valid",
"value"
],
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"is-accessor-descriptor",
"is-data-descriptor",
"is-descriptor",
"isobject"
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],
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,"_from": "is-descriptor@1.0.2"
}

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{
"name": "snapdragon-node",
"description": "Snapdragon utility for creating a new AST node in custom code, such as plugins.",
"version": "2.1.1",
"homepage": "https://github.com/jonschlinkert/snapdragon-node",
"author": "Jon Schlinkert (https://github.com/jonschlinkert)",
"repository": "jonschlinkert/snapdragon-node",
"bugs": {
"url": "https://github.com/jonschlinkert/snapdragon-node/issues"
},
"license": "MIT",
"files": [
"index.js"
],
"main": "index.js",
"engines": {
"node": ">=0.10.0"
},
"scripts": {
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},
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"snapdragon-util": "^3.0.1"
},
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"gulp-eslint": "^4.0.0",
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"mocha": "^3.4.2",
"snapdragon": "^0.11.0"
},
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"transform"
],
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