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Usage with TypeScript

The library comes with built-in type definitions, so there is no need to download anything separately from @types. Most of the defined types accept two generic parameters. The first (which is required) allows you to define the shape of the data in your cell objects. The second one allows you to define the type of the value property that is used by custom dataEditor components and onCellsChanged callbacks (this is not required, and it defaults to string) Basic usage looks like this:

import * as React from 'react';
import ReactDataSheet from 'react-datasheet';
import "react-datasheet/lib/react-datasheet.css";

export interface GridElement extends ReactDataSheet.Cell<GridElement, number> {
    value: number | null;
}

class MyReactDataSheet extends ReactDataSheet<GridElement, number> { }

interface AppState {
    grid: GridElement[][];
}

//You can also strongly type all the Components or SFCs that you pass into ReactDataSheet.
let cellRenderer: ReactDataSheet.CellRenderer<GridElement, number> = (props) => {
    const backgroundStyle = props.cell.value && props.cell.value < 0 ? {color: 'red'} : undefined;
    return (
        <td style={backgroundStyle} onMouseDown={props.onMouseDown} onMouseOver={props.onMouseOver} onDoubleClick={props.onDoubleClick}  className="cell">
            {props.children}
        </td>
    )
}

export class App extends React.Component<{}, AppState> {
    constructor (props: {}) {
      super(props)
      this.state = {
        grid: [
          [{value:  1}, {value:  -3}],
          [{value:  -2}, {value:  4}]
        ]
      }
    }
    render () {
      return (
        <MyReactDataSheet
          data={this.state.grid}
          valueRenderer={(cell) => cell.value}
          onCellsChanged={changes => {
            const grid = this.state.grid.map(row => [...row])
            changes.forEach(({cell, row, col, value}) => {
              grid[row][col] = {...grid[row][col], value}
            })
            this.setState({grid})
          }}
          cellRenderer={cellRenderer}
        />
      )
    }
  }
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