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    define-properties
    DefinitelyTyped icon, indicating that this package has TypeScript declarations provided by the separate @types/define-properties package

    1.1.3 • Public • Published

    define-properties Version Badge

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    browser support

    Define multiple non-enumerable properties at once. Uses Object.defineProperty when available; falls back to standard assignment in older engines. Existing properties are not overridden. Accepts a map of property names to a predicate that, when true, force-overrides.

    Example

    var define = require('define-properties');
    var assert = require('assert');
     
    var obj = define({ a: 1, b: 2 }, {
        a: 10,
        b: 20,
        c: 30
    });
    assert(obj.a === 1);
    assert(obj.b === 2);
    assert(obj.c === 30);
    if (define.supportsDescriptors) {
        assert.deepEqual(Object.keys(obj), ['a', 'b']);
        assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'c'), {
            configurable: true,
            enumerable: false,
            value: 30,
            writable: false
        });
    }

    Then, with predicates:

    var define = require('define-properties');
    var assert = require('assert');
     
    var obj = define({ a: 1, b: 2, c: 3 }, {
        a: 10,
        b: 20,
        c: 30
    }, {
        a: function () { return false; },
        b: function () { return true; }
    });
    assert(obj.a === 1);
    assert(obj.b === 20);
    assert(obj.c === 3);
    if (define.supportsDescriptors) {
        assert.deepEqual(Object.keys(obj), ['a', 'c']);
        assert.deepEqual(Object.getOwnPropertyDescriptor(obj, 'b'), {
            configurable: true,
            enumerable: false,
            value: 20,
            writable: false
        });
    }

    Tests

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

    Install

    npm i define-properties

    DownloadsWeekly Downloads

    16,509,431

    Version

    1.1.3

    License

    MIT

    Unpacked Size

    23 kB

    Total Files

    10

    Last publish

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