text: export function renderValue(cell, row, col, valueRenderer) {
    var value = valueRenderer(cell, row, col);
    return value === null || typeof value === 'undefined' ? '' : value;
  }
  
  export function renderData(cell, row, col, valueRenderer, dataRenderer) {
    var value = dataRenderer ? dataRenderer(cell, row, col) : null;
    return value === null || typeof value === 'undefined' ? renderValue(cell, row, col, valueRenderer) : value;
  }