util.types.isAsyncFunction(value)

• value <any>

• 返回：<boolean>

  ¥Returns: <boolean>

如果值为 异步函数，则返回 true。这只会报告 JavaScript 引擎看到的内容；特别是，如果使用了转译工具，返回值可能与原始源代码不匹配。

¥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 拷贝