function trashit() {
  var sourcefolder=DriveApp.getFolderById('source folder ID here');  //My Drive folder to take the files from.
  var files=sourcefolder.getFiles();
  supportsTeamDrives: true;
  while(files.hasNext()) {  //contintue while statement until all files are run.
    var file=files.next();
    var filetype=DriveApp.getFilesByType(MimeType.GOOGLE_DOCS);

    if (filetype == "GOOGLE_DOCS") {  //code does this IF statement when the file type matches
      supportsTeamDrives: true;
      supportTeamDrives: true;
      file.setTrashed(true);
    };

  }
}