ngxs-action-decorator.ts

function Action(actions, options) {
  return function(target, name, descriptor) {
    const meta = ensureStoreMetadata(target.constructor);
    if (!Array.isArray(actions)) {
      actions = [actions];
    }
    for (const action of actions) {
      const type = action.type;
      if (!action.type) {
        throw new Error(
          `Action ${action.name} is missing a static "type" property`
        );
      }
      if (!meta.actions[type]) {
        meta.actions[type] = [];
      }
      meta.actions[type].push({
        fn: name,
        options: options || {},
        type
      });
    }
  };
}