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

To use the valueOf function from the fs-extra library in JavaScript, you must first install it using npm:

index.tsx
npm install fs-extra
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Then, you can use the valueOf function to get the file descriptor of a file on a POSIX file system:

index.tsx
const fs = require('fs-extra');

(async () => {
  const file = await fs.open('/path/to/file', 'r');
  const fd = file.valueOf();
  console.log(fd); // file descriptor of the file
})();
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The open function is used to open a file, and returns a Promsie<FileHandle> that resolves to an object representing the opened file. The valueOf function can then be called on this object to get the file descriptor.

Note that the valueOf function only works on POSIX file systems, and may not work on other systems such as Windows.