@jsopen/objects/esm/type-guards.js

Helper utilities for working with JavaScript objects and arrays

export function isBuiltIn(v) {
    return ((v &&
        typeof v === 'object' &&
        (v instanceof Date ||
            v instanceof RegExp ||
            v instanceof Map ||
            v instanceof Set ||
            v instanceof WeakMap ||
            v instanceof WeakSet ||
            v instanceof WeakRef ||
            v instanceof Promise ||
            v instanceof Error ||
            v instanceof ArrayBuffer ||
            v instanceof Uint8Array ||
            v instanceof Uint8ClampedArray ||
            v instanceof Uint16Array ||
            v instanceof Uint32Array ||
            v instanceof BigUint64Array ||
            v instanceof Int8Array ||
            v instanceof Int16Array ||
            v instanceof Int32Array ||
            v.constructor.name === 'SharedArrayBuffer' ||
            Buffer.isBuffer(v))) ||
        Array.isArray(v));
}
export function isConstructor(fn) {
    return (typeof fn === 'function' &&
        fn.prototype &&
        fn.prototype.constructor === fn &&
        fn.prototype.constructor.name !== 'Function' &&
        fn.prototype.constructor.name !== 'embedded');
}
export function isIterable(x) {
    return Symbol.iterator in x;
}
export function isAsyncIterable(x) {
    return Symbol.asyncIterator in x;
}