is-accessor-descriptor
Advanced tools
Package description
The is-accessor-descriptor npm package is used to check if an object property descriptor defines an accessor descriptor. An accessor descriptor is one that includes getter and/or setter functions, as opposed to a data descriptor which contains a value and is writable.
Check if a descriptor is an accessor descriptor
This feature allows you to verify if a given property descriptor from an object is an accessor descriptor. It returns true if the descriptor has a get or set key, and false otherwise.
{"isAccessorDescriptor": require('is-accessor-descriptor');
var descriptor = Object.getOwnPropertyDescriptor({get foo() {}}, 'foo');
console.log(isAccessorDescriptor(descriptor)); //=> true
}Check if an object is an accessor descriptor
This feature allows you to check if a plain object mimics the structure of an accessor descriptor. It is useful for validation purposes when you have an object that should represent a descriptor and you want to ensure it is an accessor descriptor.
{"isAccessorDescriptor": require('is-accessor-descriptor');
console.log(isAccessorDescriptor({get: function() {}})); //=> true
console.log(isAccessorDescriptor({set: function() {}})); //=> true
console.log(isAccessorDescriptor({value: 123})); //=> false
}This package is similar to is-accessor-descriptor but checks for data descriptors instead. A data descriptor is an object with a value property and optionally writable, enumerable, and configurable properties. It is the counterpart to is-accessor-descriptor, which checks for accessor descriptors.
is-descriptor is a more general package that checks if an object is a valid property descriptor, which can be either a data descriptor or an accessor descriptor. It is a superset of is-accessor-descriptor and is-data-descriptor functionalities.
While not specifically for checking descriptors, is-plain-object can be used to determine if an object is plain (i.e., created by the Object constructor or one with a null prototype). This can be a preliminary check before further validation as a descriptor.
Changelog
Readme
Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
const isAccessorDescriptor = require('is-accessor-descriptor');
const assert = require('assert');
const obj = {
get foo() {},
bar: { get: function() {} }
};
assert.equal(true, isAccessorDescriptor(obj, 'foo'));
assert.equal(false, isAccessorDescriptor(obj, 'bar'));
// or, if you already have the descriptor you can pass it directly
const foo = Object.getOwnPropertyDescriptor(obj, 'foo');
assert.equal(true, isAccessorDescriptor(foo));
const bar = Object.getOwnPropertyDescriptor(obj, 'bar');
assert.equal(false, isAccessorDescriptor(bar));
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Simply clone the repo, npm install, and run npm test
FAQs
Returns true if a value has the characteristics of a valid JavaScript accessor descriptor.
The npm package is-accessor-descriptor receives a total of 25,865,635 weekly downloads. As such, is-accessor-descriptor popularity was classified as popular.
We found that is-accessor-descriptor demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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