columns = [
{ type: 'string', name: 'Task ID' },
{ type: 'string', name: 'Task Name' },
{ type: 'date', name: 'Start Date' },
{ type: 'date', name: 'End Date' },
{ type: 'number', name: 'Duration' },
{ type: 'number', name: 'Percent Complete' },
{ type: 'string', name: 'Dependencies' }
]