.add and .remove methods not working in js

[arkRedM]

const fuse = new Fuse([..])  
// add
fuse.add("xyz")
=> ;; .add is not a function(err)

Am I reading the docs wrong? https://fusejs.io/api/methods.html

Functionality I am looking for is:

1. Add items to the index after the index is made using fuse instance created as above
2. Remove items from the index using fuse instance created as above

@krisk

Thanks