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Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for data descriptors and accessor descriptors.
const isDescriptor = require('is-descriptor');
const assert = require('assert');
assert.equal(isDescriptor({ value: 'foo' }), true);
assert.equal(isDescriptor({ get() {}, set() {} }), true);
assert.equal(isDescriptor({ get: 'foo', set() {} }), false);
You may also check for a descriptor by passing an object as the first argument and property name (string
) as the second argument.
const obj = { foo: 'abc' };
Object.defineProperty(obj, 'bar', {
value: 'xyz'
});
assert.equal(isDescriptor(obj, 'foo'), true);
assert.equal(isDescriptor(obj, 'bar'), true);
false
when not an object
assert.equal(isDescriptor('a'), false);
assert.equal(isDescriptor(null), false);
assert.equal(isDescriptor([]), false);
true
when the object has valid properties with valid values.
assert.equal(isDescriptor({ value: 'foo' }), true);
assert.equal(isDescriptor({ value() {} }), true);
false
when the object has invalid properties
assert.equal(isDescriptor({ value: 'foo', enumerable: 'baz' }), false);
assert.equal(isDescriptor({ value: 'foo', configurable: 'baz' }), false);
assert.equal(isDescriptor({ value: 'foo', get() {} }), false);
assert.equal(isDescriptor({ get() {}, value() {} }), false);
false
when a value is not the correct type
assert.equal(isDescriptor({ value: 'foo', enumerable: 'foo' }), false);
assert.equal(isDescriptor({ value: 'foo', configurable: 'foo' }), false);
assert.equal(isDescriptor({ value: 'foo', writable: 'foo' }), false);
true
when the object has valid properties with valid values.
assert.equal(isDescriptor({ get() {}, set() {} }), true);
assert.equal(isDescriptor({ get() {} }), true);
assert.equal(isDescriptor({ set() {} }), true);
false
when the object has invalid properties
assert.equal(isDescriptor({ get() {}, set() {}, enumerable: 'baz' }), false);
assert.equal(isDescriptor({ get() {}, writable: true }), false);
assert.equal(isDescriptor({ get() {}, value: true }), false);
false
when an accessor is not a function
assert.equal(isDescriptor({ get() {}, set: 'baz' }), false);
assert.equal(isDescriptor({ get: 'foo', set() {} }), false);
assert.equal(isDescriptor({ get: 'foo', bar: 'baz' }), false);
assert.equal(isDescriptor({ get: 'foo', set: 'baz' }), false);
false
when a value is not the correct type
assert.equal(isDescriptor({ get() {}, set() {}, enumerable: 'foo' }), false);
assert.equal(isDescriptor({ set() {}, configurable: 'foo' }), false);
assert.equal(isDescriptor({ get() {}, configurable: 'foo' }), false);
You might also be interested in these projects:
Simply clone the repo, npm install
, and run npm test