how to use the watchfile function from the fs-extra library in typescript

To use the watchFile function from the fs-extra library in TypeScript, you can follow the steps below:

1. First, you should make sure that you have installed both the typescript and fs-extra packages. You can run the following command to install them:

   index.ts
   npm install typescript fs-extra
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2. Next, you should create a TypeScript module and import the necessary modules. In this example, we will use the watchFile function to monitor changes to a file. Here's an example code block:

   index.ts
   import * as fs from 'fs-extra';
   
   const filePath = '/path/to/file';
   
   fs.watchFile(filePath, (curr, prev) => {
     // Handle file changes here
   });
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   In this code block, we use the fs module from fs-extra to import the watchFile function. We then call this function with the file path and a callback function to handle file changes.

3. Finally, you can compile the TypeScript code to JavaScript using the tsc command. Here's an example command:

   index.ts
   tsc filename.ts
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   This will generate a JavaScript file that you can run with Node.js:

   index.ts
   node filename.js
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   This will start watching the file for changes, and the callback function will be called each time the file is modified.

And that's how you can use the watchFile function from the fs-extra library in TypeScript.