Returns true if the value is a built-in ArrayBuffer or SharedArrayBuffer instance.

Returns true if the value is an arguments object.

Returns true if the value is a built-in ArrayBuffer instance. This does not include SharedArrayBuffer instances. Usually, it is desirable to test for both; See util.types.isAnyArrayBuffer() for that.

Returns true if the value is an instance of one of the ArrayBuffer views, such as typed array objects or DataView. Equivalent to ArrayBuffer.isView().

Returns true if the value is an async function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used.

Returns true if the value is a BigInt64Array instance.

Returns true if the value is a BigInt object, e.g. created by Object(BigInt(123)).

Returns true if the value is a BigUint64Array instance.

Returns true if the value is a boolean object, e.g. created by new Boolean().

Returns true if the value is any boxed primitive object, e.g. created by new Boolean(), new String() or Object(Symbol()).

Returns true if value is a CryptoKey, false otherwise.

Returns true if the value is a built-in DataView instance.

Returns true if the value is a built-in Date instance.

Returns true if the value is a native External value.

Returns true if the value is a built-in Float32Array instance.

Returns true if the value is a built-in Float64Array instance.

Returns true if the value is a generator function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used.

Returns true if the value is a generator object as returned from a built-in generator function. This only reports back what the JavaScript engine is seeing; in particular, the return value may not match the original source code if a transpilation tool was used.

Returns true if the value is a built-in Int16Array instance.

Returns true if the value is a built-in Int32Array instance.

Returns true if the value is a built-in Int8Array instance.

Returns true if value is a KeyObject, false otherwise.

Returns true if the value is a built-in Map instance.

Returns true if the value is an iterator returned for a built-in Map instance.

Returns true if the value is an instance of a Module Namespace Object.

Returns true if the value was returned by the constructor of a built-in Error type.

Returns true if the value is a number object, e.g. created by new Number().

Returns true if the value is a built-in Promise.

Returns true if the value is a Proxy instance.

Returns true if the value is a regular expression object.

Returns true if the value is a built-in Set instance.

Returns true if the value is an iterator returned for a built-in Set instance.

Returns true if the value is a built-in SharedArrayBuffer instance. This does not include ArrayBuffer instances. Usually, it is desirable to test for both; See util.types.isAnyArrayBuffer() for that.

Returns true if the value is a string object, e.g. created by new String().

Returns true if the value is a symbol object, created by calling Object() on a Symbol primitive.

Returns true if the value is a built-in TypedArray instance.

Returns true if the value is a built-in Uint16Array instance.

Returns true if the value is a built-in Uint32Array instance.

Returns true if the value is a built-in Uint8Array instance.

Returns true if the value is a built-in Uint8ClampedArray instance.

Returns true if the value is a built-in WeakMap instance.

Returns true if the value is a built-in WeakSet instance.