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Contributing

Returns true if a value has the characteristics of a valid JavaScript data descriptor.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

Install

Install with npm:

$ npm install --save is-data-descriptor

Usage

var isDataDesc = require('is-data-descriptor');

Examples

true when the descriptor has valid properties with valid values.

// `value` can be anything
isDataDesc({value: 'foo'})
isDataDesc({value: function() {}})
isDataDesc({value: true})
//=> true

false when not an object

isDataDesc('a')
//=> false
isDataDesc(null)
//=> false
isDataDesc([])
//=> false

false when the object has invalid properties

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

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).

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>

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

</details>

<details>

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:

$ npm install && npm test

</details>

<details>

Building docs

_(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)_

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

</details>

Related projects

You might also be interested in these projects:

Contributors

Commits Contributor
21 jonschlinkert
2 realityking

Author

Jon Schlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).


This file was generated by verb-generate-readme, v0.6.0, on November 01, 2017.