How can I implement file locking in Node.js?

How can I implement file locking in Node.js?

You can use the 'fs' module along with a library like 'proper-lockfile' to implement file locking in Node.js.

Can you show me a code example?

Sure! Here's a simple example:

const lockfile = require('proper-lockfile');

async function lockFile() {
    await lockfile.lock('myfile.txt');
    // Perform file operations
    await lockfile.unlock('myfile.txt');
}

lockFile();

What happens if the file is already locked?

If the file is already locked, trying to lock it again will throw an error. You can handle this by catching the error and deciding how to proceed.

Are there any alternatives to 'proper-lockfile'?

Yes, you can also use 'lockfile' or implement your own locking mechanism using file descriptors.