import * as React from 'react'; import { DataGrid, ColDef, ValueGetterParams } from '@material-ui/data-grid'; const columns: ColDef[] = [ { field: 'id', headerName: 'ID', width: 70 }, { field: 'firstName', headerName: 'First name', width: 130 }, { field: 'lastName', headerName: 'Last name', width: 130 }, { field: 'age', headerName: 'Age', type: 'number', width: 90, }, { field: 'fullName', headerName: 'Full name', description: 'This column has a value getter and is not sortable.', sortable: false, width: 160, valueGetter: (params: ValueGetterParams) => `${params.getValue('firstName') || ''} ${params.getValue('lastName') || ''}`, }, ]; const rows = [ { id: 1, lastName: 'Snow', firstName: 'Jon', age: 35 }, { id: 2, lastName: 'Lannister', firstName: 'Cersei', age: 42 }, { id: 3, lastName: 'Lannister', firstName: 'Jaime', age: 45 }, { id: 4, lastName: 'Stark', firstName: 'Arya', age: 16 }, { id: 5, lastName: 'Targaryen', firstName: 'Daenerys', age: null }, { id: 6, lastName: 'Melisandre', firstName: null, age: 150 }, { id: 7, lastName: 'Clifford', firstName: 'Ferrara', age: 44 }, { id: 8, lastName: 'Frances', firstName: 'Rossini', age: 36 }, { id: 9, lastName: 'Roxie', firstName: 'Harvey', age: 65 }, ]; export default function DataTable() { return (