# TypeScript

## Content

You can add TypeScript support to SpreadJS. TypeScript provides strongly-typed access and better information about your code.
You can download TypeScript and get additional information from the TypeScript web site, [https://www.typescriptlang.org/](https://www.typescriptlang.org/)
The TypeScript definition file for SpreadJS is located in the definition folder under the main product folder (`SpreadJS\definition\GC.Spread.Sheets.d.ts`).
Use the following steps to add TypeScript support to SpreadJS.

1. Add GC.Spread.Sheets.d.ts and jquery.d.ts references to your typescript file.

    ```
    /// <reference path="path/jquery.d.ts" />
    /// <reference path="path/GC.Spread.Sheets.d.ts" />
    ```
2. Add code to your application. Information about SpreadJS is displayed as in the following examples.
    ![](https://gcdocumentsitekrblob.blob.core.windows.net/document-site-files/images/8d606653-16a0-474d-b9dc-e2b4d01c2446/images/typescript.png)