Google Apps 脚本如何检测 blob 类型？

Question

var data = Utilities.newBlob("THis is blob data", MimeType.PLAIN_TEXT, 'test.txt');

if (  ?? ) then Logger.log('yes, this is blob') ;

如何检测数据是blob？（不是对象）

instanceof Blob
// or
instanceof BlobSource

结果：ReferenceError：Blob或BlobSource未定义

instanceof GoogleAppsScript.Base.Blob;
// ReferenceError: `GoogleAppsScript` is not defined

typeof data
// result: object

Object.prototype.toString.call(data);
// result: [object Object]

Answer 1

尝试使用鸭子打字：

if (typeof data.copyBlob === 'function')
{
  // it's probably a blob
  console.log('yep');
}

参考：Blob 类