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

Here's an example of how to use fchmodsync function from fs-extra package to change file permissions synchronously in Node.js:

const fs = require('fs-extra');

// Set file permissions to read-only for owner and group
fs.fchmodSync('/path/to/file', 0o440);
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In this example, the fchmodSync function is called with two arguments: the path to the file whose permissions need to be changed, and the new permissions value in octal format. 0o440 sets file permissions to read-only for owner and group, and no permissions for others.

Note that this function works synchronously and may block the event loop if it takes a long time to complete. For asynchronous version, you can use fchmod function instead.