@fluent-windows/hooks/es/useAction/subscribers.js

Fluent-Windows React hooks.

const subscribers = new Map();

function getAction(type) {
  return subscribers.get(type);
}

export function subscribe(type, callback) {
  if (!type || !callback) return;
  if (!subscribers.has(type)) subscribers.set(type, new Set());
  getAction(type).add(callback);
}
export function unsubscribe(type, callback) {
  if (!type || !callback) return;
  if (!subscribers.has(type)) return;
  getAction(type).delete(callback);
  if (getAction(type).size === 0) subscribers.delete(type);
}
export function dispatch(param) {
  const {
    type,
    payload
  } = param;
  if (!type) return;
  if (!subscribers.has(type)) return;
  getAction(type).forEach(callback => {
    callback.call(undefined, payload);
  });
}