import { ADD_SOURCE, ADD_TARGET, REMOVE_SOURCE, REMOVE_TARGET, } from '../actions/registry';
export function reduce(state = 0, action) {
    switch (action.type) {
        case ADD_SOURCE:
        case ADD_TARGET:
            return state + 1;
        case REMOVE_SOURCE:
        case REMOVE_TARGET:
            return state - 1;
        default:
            return state;
    }
}