Overwrite remote participant

I want to overwrite remote participants in the Redux state
management.
I use this code for overwriting :

APP.store.dispatch(setRemoteParticipants(newList))
export function setRemoteParticipants(participants: Array<string>) {
    return {
        type: SET_REMOTE_PARTICIPANTS,
        participants
    };
}

but I want to find the first time that this property was set in the code.
where is the first-time value was set on it?