// widget in config.js
{
  type: 'sheets.list',
  // You can find the documentId in sheet URL
  documentId: 'abasdfsdfafsd123123',
  range: 'A1:D10',
  // Values (cells) to show on each row. Use one or multiple column letters:
  // Uses https://www.npmjs.com/package/string-format for formatting
  fields: [
    'Event date: {A!date}',
    '{B!uppercase}',
    '{C} {D}'
  ],
  // Custom formatter functions, name must match with the usage: !method
  // NOTE: Call method.toString() to every function!
  // NOTE: `moment` is available
  format: {
    // !date formatter
    date: function(s){
      return new moment(s).format('YYYY-MM-DD');
    }.toString(),
    // !uppercase formatter
    uppercase: function(s) {
      return s.toUpperCase();
    }.toString()
  },
  // Custom function to filter some results rows
  // If defined, each row is processed through it.
  // Return `false` if you want to filter the row out and `true`
  // for inclusion.
  // NOTE: Only one variable is passed, containing all columns from current row
  // NOTE: Variable `columns` does not contain the columns out of the range
  // NOTE: Call method.toString() to every function!
  filter: function(columns){
    var eventStart = moment(columns.B, ['YYYY-MM-DD']);
    // Filter out the results that are in past
    if (eventStart.isBefore(new moment())) {
      return false;
    }
    return true;
  }.toString(),
  columns: 1, rows: 2,
  x: 0, y: 0
}