@mui/x-data-grid/esm/hooks/features/editing/utils.js

The Community plan edition of the Data Grid components (MUI X).

export const getDefaultCellValue = colDef => {
  switch (colDef.type) {
    case 'boolean':
      return false;
    case 'date':
    case 'dateTime':
    case 'number':
      return undefined;
    case 'singleSelect':
      return null;
    case 'string':
    default:
      return '';
  }
};