Create text file without BOM google apps script

I am trying to create a text file in Google Drive that will be read by another program for automation. However, if I create the text file by Google Script the text will have BOM, which make automation quite unreliable. I am currently using

var textFile = jobFolder.createFile(aFileName, fileContent,MimeType.PLAIN_TEXT)
var textFile = jobFolder.createFile(aFileName, fileContent)

What's the way to create text file without BOM with Google App Script?

At the BOM data of UTF-8, EF BB BF is added to the top of data. In this case, I think that to remove the top 3 bytes is to achieve your goal. So how about the following modification?

From:

var textFile = jobFolder.createFile(aFileName, fileContent,MimeType.PLAIN_TEXT)

To:

var [,,,...newData] = Utilities.newBlob(fileContent).getBytes();
var blob = Utilities.newBlob(newData, MimeType.PLAIN_TEXT, aFileName);
var textFile = jobFolder.createFile(blob);

• In this modification, it supposes that fileContent is the text data of BOM. Please be careful this.
• In this case, please declare the values of aFileName and jobFolder. Please be careful this.
• In this modified script, newData is the data that the top 3 bytes are removed.

Note:

• When your data of fileContent is not UTF-8, please check the wiki of Byte order mark (BOM). From this wiki, the top characters can be confirmed.

References:

• Byte order mark (BOM)
• newBlob(data, contentType, name)
• createFile(blob)

Added:

From your following replying,

I have error on this line var [,,,...newData] = Utilities.newBlob(fileContent).getBytes();. Maybe because my Google App Script is the older version. What can I try for this?

I understood that you are not using V8 runtime. In this case, how about the following script?

Sample script:

var newData = Utilities.newBlob(fileContent).getBytes();
newData.splice(0, 3);
var blob = Utilities.newBlob(newData, MimeType.PLAIN_TEXT, aFileName);
var textFile = jobFolder.createFile(blob);