var data = Utilities.newBlob("THis is blob data", MimeType.PLAIN_TEXT, 'test.txt'); if ( ?? ) then Logger.log('yes, this is blob') ;¿Cómo detectar datos es blob? (no objeto)
instanceof Blob // or instanceof BlobSource Resultado: ReferenceError: Blob o BlobSource no está definido
instanceof GoogleAppsScript.Base.Blob; // ReferenceError: `GoogleAppsScript` is not defined typeof data // result: object Object.prototype.toString.call(data); // result: [object Object]Intenta usar la escritura de pato :
if (typeof data.copyBlob === 'function') { // it's probably a blob console.log('yep'); }Referencia: Class Blob