getListenerStats

The getListenerStats method provides a set of statistics about the listeners registered with the Indexes object, and is used for debugging purposes.

getListenerStats(): IndexesListenerStats

The IndexesListenerStats object contains a breakdown of the different types of listener.

The statistics are only populated in a debug build: production builds return an empty object. The method is intended to be used during development to ensure your application is not leaking listener registrations, for example.

const store = createStore();
const indexes = createIndexes(store);
indexes.addSliceIdsListener(null, () => {
  console.log('Slice Ids changed');
});
indexes.addSliceRowIdsListener(null, null, () => {
  console.log('Slice Row Ids changed');
});

console.log(indexes.getListenerStats());
// -> {sliceIds: 1, sliceRowIds: 1}