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isAsyncFunction - util/types - Node documentation
function isAsyncFunction

Usage in Deno

import { isAsyncFunction } from "node:util/types";
isAsyncFunction(object: unknown): boolean

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.

util.types.isAsyncFunction(function foo() {});  // Returns false
util.types.isAsyncFunction(async function foo() {});  // Returns true

Parameters

object: unknown

Return Type

boolean