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

    1.1.4 • Public • Published

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    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

    32,658,061

    Version

    1.1.4

    License

    MIT

    Unpacked Size

    10.4 kB

    Total Files

    9

    Last publish

    Collaborators

    • ljharb