GitHub - inspect-js/is-weakref: Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag. (original) (raw)

is-weakref Version Badge

github actions coverage dependency status dev dependency status License Downloads

[![npm badge][11]][1]

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

Example

var isWeakRef = require('is-weakref'); assert(!isWeakRef(function () {})); assert(!isWeakRef(null)); assert(!isWeakRef(function* () { yield 42; return Infinity; }); assert(!isWeakRef(Symbol('foo'))); assert(!isWeakRef(1n)); assert(!isWeakRef(Object(1n)));

assert(!isWeakRef(new Set())); assert(!isWeakRef(new WeakSet())); assert(!isWeakRef(new Map())); assert(!isWeakRef(new WeakMap()));

assert(isWeakRef(new WeakRef({})));

class MyWeakRef extends WeakRef {} assert(isWeakRef(new MyWeakRef({})));

Tests

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