Method PickerBuilder.setSelectableMimeTypes

const mimeTypes = ['image/png', 'image/jpeg'];
const builder = new google.pickerPickerBuilder()
  .setSelectableMimeTypes(mimeTypes.join(','));

 const mimeTypes = [
 'application/vnd.google-apps.document',
 'application/vnd.google-apps.presentation',
 'application/vnd.google-apps.spreadsheet',
];

const builder = new google.pickerPickerBuilder()
  .setSelectableMimeTypes(mimeTypes.join(','));

setSelectableMimeTypes(type: string): PickerBuilder;