@zitterorg/nostrum-voluptatibus

An ES2017 spec-compliant shim for Object.getOwnPropertyDescriptors that works in ES5. Invoke its "shim" method to shim Object.getOwnPropertyDescriptors if it is unavailable, and if Object.getOwnPropertyDescriptor is available.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Example

1var getDescriptors = require('@zitterorg/nostrum-voluptatibus');
2var assert = require('assert');
3var obj = { normal: Infinity };
4var enumDescriptor = {
5	enumerable: false,
6	writable: false,
7	configurable: true,
8	value: true
9};
10var writableDescriptor = {
11	enumerable: true,
12	writable: true,
13	configurable: true,
14	value: 42
15};
16var symbol = Symbol();
17var symDescriptor = {
18	enumerable: true,
19	writable: true,
20	configurable: false,
21	value: [symbol]
22};
23
24Object.defineProperty(obj, 'enumerable', enumDescriptor);
25Object.defineProperty(obj, 'writable', writableDescriptor);
26Object.defineProperty(obj, 'symbol', symDescriptor);
27
28var descriptors = getDescriptors(obj);
29
30assert.deepEqual(descriptors, {
31	normal: {
32		enumerable: true,
33		writable: true,
34		configurable: true,
35		value: Infinity
36	},
37	enumerable: enumDescriptor,
38	writable: writableDescriptor,
39	symbol: symDescriptor
40});

1var getDescriptors = require('@zitterorg/nostrum-voluptatibus');
2var assert = require('assert');
3/* when Object.getOwnPropertyDescriptors is not present */
4delete Object.getOwnPropertyDescriptors;
5var shimmedDescriptors = getDescriptors.shim();
6assert.equal(shimmedDescriptors, getDescriptors);
7assert.deepEqual(shimmedDescriptors(obj), getDescriptors(obj));

1var getDescriptors = require('@zitterorg/nostrum-voluptatibus');
2var assert = require('assert');
3/* when Object.getOwnPropertyDescriptors is present */
4var shimmedDescriptors = getDescriptors.shim();
5assert.notEqual(shimmedDescriptors, getDescriptors);
6assert.deepEqual(shimmedDescriptors(obj), getDescriptors(obj));

Tests

Simply clone the repo, npm install, and run npm test