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/**
* External dependencies
*/
import { uniqueId } from 'lodash';
export const TYPES = {
ADD_EVENT_CALLBACK: 'add_event_callback',
REMOVE_EVENT_CALLBACK: 'remove_event_callback',
};
export const actions = {
addEventCallback: ( eventType, callback, priority = 10 ) => {
return {
id: uniqueId(),
type: TYPES.ADD_EVENT_CALLBACK,
eventType,
callback,
priority,
};
},
removeEventCallback: ( eventType, id ) => {
return {
id,
type: TYPES.REMOVE_EVENT_CALLBACK,
eventType,
};
},
};
/**
* Handles actions for emmitters
*
* @param {Object} state Current state.
* @param {Object} action Incoming action object
*/
export const reducer = (
state = {},
{ type, eventType, id, callback, priority }
) => {
const newEvents = new Map( state[ eventType ] );
switch ( type ) {
case TYPES.ADD_EVENT_CALLBACK:
newEvents.set( id, { priority, callback } );
return {
...state,
[ eventType ]: newEvents,
};
case TYPES.REMOVE_EVENT_CALLBACK:
newEvents.delete( id );
return {
...state,
[ eventType ]: newEvents,
};
}
return state;
};