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    is-finalizationregistry

    1.0.2 • Public • Published

    is-finalizationregistry Version Badge

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    Is this value a JS FinalizationRegistry? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

    Example

    var isFinalizationRegistry = require('is-finalizationregistry');
    assert(!isFinalizationRegistry(function () {}));
    assert(!isFinalizationRegistry(null));
    assert(!isFinalizationRegistry(function* () { yield 42; return Infinity; });
    assert(!isFinalizationRegistry(Symbol('foo')));
    assert(!isFinalizationRegistry(1n));
    assert(!isFinalizationRegistry(Object(1n)));
    
    assert(!isFinalizationRegistry(new Set()));
    assert(!isFinalizationRegistry(new WeakSet()));
    assert(!isFinalizationRegistry(new Map()));
    assert(!isFinalizationRegistry(new WeakMap()));
    assert(!isFinalizationRegistry(new WeakRef({})));
    
    assert(isFinalizationRegistry(new FinalizationRegistry(function () {})));
    
    class MyFinalizationRegistry extends FinalizationRegistry {}
    assert(isFinalizationRegistry(new MyFinalizationRegistry(function () {})));

    Tests

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

    Install

    npm i is-finalizationregistry

    DownloadsWeekly Downloads

    27,269

    Version

    1.0.2

    License

    MIT

    Unpacked Size

    12.7 kB

    Total Files

    10

    Last publish

    Collaborators

    • ljharb