@taraai/read-write/lib/hooks/useRead.js

Synchronous NoSQL/Firestore for React

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = useRead;

var _filter = _interopRequireDefault(require("lodash/filter"));

var _isEqual = _interopRequireDefault(require("lodash/isEqual"));

var _some = _interopRequireDefault(require("lodash/some"));

var _react = require("react");

var _useFirestore = _interopRequireDefault(require("../redux-firebase/useFirestore"));

var _query = require("../utils/query");

var _useCache = _interopRequireDefault(require("./useCache"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const getChanges = function () {
  let data = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
  let prevData = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
  const result = {};
  result.added = (0, _filter.default)(data, d => !(0, _some.default)(prevData, p => (0, _isEqual.default)(d, p)));
  result.removed = (0, _filter.default)(prevData, p => !(0, _some.default)(data, d => (0, _isEqual.default)(p, d)));
  return result;
};

function useRead(queries) {
  let selection = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
  const firestore = (0, _useFirestore.default)();
  const firestoreIsEnabled = !!firestore;
  const queryRef = (0, _react.useRef)();
  const aliasRef = (0, _react.useRef)();
  (0, _react.useEffect)(() => {
    const queryArray = Array.isArray(queries) ? queries : [queries];
    if (!firestoreIsEnabled || (0, _isEqual.default)(queryArray, queryRef.current)) return;
    const changes = getChanges(queryArray, queryRef.current);
    queryRef.current = queryArray;
    aliasRef.current = queryRef.current.map(_query.getQueryName);
    firestore.unsetListeners(changes.removed);
    firestore.setListeners(changes.added);
  }, [aliasRef.current]);
  (0, _react.useEffect)(() => () => {
    if (!firestoreIsEnabled || !queryRef.current) return;
    queryRef.current = [];
    aliasRef.current = undefined;
    firestore.unsetListeners && firestore.unsetListeners(queryRef.current);
  }, []);

  if (selection === '::alias') {
    return Array.isArray(queries) ? queries.map(_query.getQueryName) : (0, _query.getQueryName)(queries);
  }

  return (0, _useCache.default)(Array.isArray(queries) ? queries.map(_query.getQueryName) : (0, _query.getQueryName)(queries), selection);
}