Is this value a JS ArrayBuffer? This module works cross-realm/iframe, does not depend on instanceof or mutable properties, and despite ES6 Symbol.toStringTag.
var assert = require('assert'); var isArrayBuffer = require('is-array-buffer'); assert(!isArrayBuffer(function () {})); assert(!isArrayBuffer(null)); assert(!isArrayBuffer(function* () { yield 42; return Infinity; }); assert(!isArrayBuffer(Symbol('foo'))); assert(!isArrayBuffer(1n)); assert(!isArrayBuffer(Object(1n))); assert(!isArrayBuffer(new Set())); assert(!isArrayBuffer(new WeakSet())); assert(!isArrayBuffer(new Map())); assert(!isArrayBuffer(new WeakMap())); assert(!isArrayBuffer(new WeakRef({}))); assert(!isArrayBuffer(new FinalizationRegistry(() => {}))); assert(!isArrayBuffer(new SharedArrayBuffer())); assert(isArrayBuffer(new ArrayBuffer())); class MyArrayBuffer extends ArrayBuffer {} assert(isArrayBuffer(new MyArrayBuffer()));
Simply clone the repo, npm install, and run npm test