Nodejs checking if resumeToken exists in oplog

Working with Data Connectors & Integrations
1

I am using changeStreams to listen for changes of some collections, so i can replicate these changes to another database.
I save the changeStream _id as a resumeToken, and each time a changeStream comes in, i update the resume token.

const changeStream = db.watch({ fullDocument: 'updateLookup' }, { resumeAfter: token });
changeStream.on('change', async next => {
// Code
}

How do i check if that resumeToken is valid or exists in main database?

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