how to use the watchfile function from fs-extra in javascript

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

1. Install fs-extra package using npm. You can install using the below command:

npm install fs-extra
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2. Import the watchFile function from fs-extra package in your JavaScript file using the below code:

index.tsx
const fse = require('fs-extra');
const watchFile = fse.watchFile;
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3. Call the watchFile function with the appropriate parameters. The first parameter is the file path that you want to watch, and the second parameter is a callback function that will be called when the file changes. You can also pass an options object as the third parameter, which contains various configuration options that you can use to customize the behavior of the watch function.

index.tsx
watchFile('path/to/file', { interval: 500 }, (curr, prev) => {
    console.log('File changed!');
    // You can perform your required operations here
});
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In the example above, we are watching the file located at path/to/file, and we have specified an interval of 500 milliseconds for the watch function to poll for changes. Whenever the file changes, the callback function will be called, and we are printing a message to the console.

You can implement your own code inside the callback function to perform the necessary operations based on the file change event.