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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/FileSystemObserver/FileSystemObserver below:

FileSystemObserver: FileSystemObserver() constructor - Web APIs

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

The FileSystemObserver() constructor creates a new FileSystemObserver object instance.

new FileSystemObserver(callback)

callback

A user-defined callback function that will be called when the observer has observed a change in the file system entry it has been asked to observe (via FileSystemObserver.observe()). The callback function will be passed the following two parameters:

records

An array of FileSystemChangeRecord objects that contain details of all the observed changes.

observer

A reference to the current FileSystemObserver object, which is made available in case, for example, you want to stop observations after the current records have been received using the FileSystemObserver.disconnect() method.

A new FileSystemObserver object.

Note: For a complete working example, check out File System Observer Demo (source code).

Before you can start observing file or directory changes, you need to initialize a FileSystemObserver to handle the observations:

const observer = new FileSystemObserver(callback);

The callback function body can be specified to return and process file change observations in any way you want:

const callback = (records, observer) => {
  for (const record of records) {
    console.log("Change detected:", record);
    const reportContent = `Change observed to ${record.changedHandle.kind} ${record.changedHandle.name}. Type: ${record.type}.`;
    sendReport(reportContent); // Some kind of user-defined reporting function
  }

  observer.disconnect();
};

Not currently part of a specification. See https://github.com/whatwg/fs/pull/165 for the relevant specification PR.

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