You can specify the MIME Type of files that you wish to find in Google Drive and the script, using the getFilesByType() method, will list all the matching files.
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function searchFiles() { var results = []; var types = [MimeType.GOOGLE_SHEETS, MimeType.GOOGLE_DOCS]; for (var t in types) { var files = DriveApp.getFilesByType(types[t]); while (files.hasNext()) { var file = files.next(); results.push(file); Logger.log([file.getDateCreated(), file.getName(), file.getUrl()].join()); } } }