Drive API Write File Javascript

DriveAPIWriteFile.js

var DriveBaseUrl        = 'https://www.googleapis.com/';
var DriveWriteUrl       = 'upload/drive/v3/files/';
// write file - update with Array Buffer                        
fetch(
    DriveBaseUrl + DriveWriteUrl + fileId,
    {
        method: 'PATCH',
        headers: {
            Authorization: 'Bearer ' + token,
            'Accept': 'text/plain',
            'Content-Type': 'text/plain'
        },
        body: ContentArrayBuffer
    }
).then(response => response.text()
).then(function(respText) {
    console.log(respText);
}).catch(function(error) {
    console.log(error);
});