@stated-library/base/dist/index.es.js

Simplified state

import { shallowEqual, createObservable } from '@stated-library/core';

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

function _objectSpread(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i] != null ? arguments[i] : {};
    var ownKeys = Object.keys(source);

    if (typeof Object.getOwnPropertySymbols === 'function') {
      ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) {
        return Object.getOwnPropertyDescriptor(source, sym).enumerable;
      }));
    }

    ownKeys.forEach(function (key) {
      _defineProperty(target, key, source[key]);
    });
  }

  return target;
}

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

var identity = function identity(x) {
  return x;
};

function makeStateEvent(rawState, event, meta, opts) {
  var deriveState = opts && opts.deriveState || identity;
  var stateData = {
    rawState: rawState,
    event: event,
    state: deriveState(rawState),
    meta: meta
  };

  if (process.env.NODE_ENV !== 'production') {
    Object.freeze(stateData);
    Object.freeze(stateData.state);
    Object.freeze(stateData.rawState);
  }

  return stateData;
}

function bindMethodsFromProto(obj) {
  var proto = Object.getPrototypeOf(obj);
  var descriptors = Object.getOwnPropertyDescriptors(proto);

  for (var _i = 0, _Object$keys = Object.keys(descriptors); _i < _Object$keys.length; _i++) {
    var key = _Object$keys[_i];

    if (key === 'constructor') {
      continue;
    }

    if (typeof descriptors[key].value === 'function') {
      obj[key] = obj[key].bind(obj);
    }
  }
}

var StatedLibBase =
/*#__PURE__*/
function () {
  function StatedLibBase(initialState, opts) {
    _classCallCheck(this, StatedLibBase);

    this.opts = void 0;
    this.stateEvent$ = void 0;
    this.state$ = void 0;
    this.opts = Object.assign({}, opts);
    var createObs = this.opts.createObs || createObservable;
    var initialEvent = makeStateEvent(initialState, 'INIT', undefined, opts);
    this.stateEvent$ = createObs(initialEvent);
    this.state$ = createObs(initialEvent.state);
  }

  _createClass(StatedLibBase, [{
    key: "setState",
    value: function setState(rawState, event, meta) {
      var stateData = shallowEqual(rawState, this.stateEvent$.value.rawState) ? _objectSpread({}, this.stateEvent$.value, {
        event: event,
        meta: meta
      }) : makeStateEvent(rawState, event, meta, this.opts);

      if (!Object.is(stateData.state, this.state$.value)) {
        this.state$.next(stateData.state);
      }

      this.stateEvent$.next(stateData);
    }
  }, {
    key: "updateState",
    value: function updateState(updatesOrGetUpdates, event, meta) {
      var updates = typeof updatesOrGetUpdates === 'function' ? updatesOrGetUpdates(this.state) : updatesOrGetUpdates;
      var rawState = Object.assign({}, this.stateEvent$.value.rawState, updates);
      this.setState(rawState, event, meta);
    }
  }, {
    key: "resetState",
    value: function resetState(rawState, event, meta) {
      this.setState(rawState, event, meta);
    }
  }, {
    key: "state",
    get: function get() {
      return this.stateEvent$.value.state;
    }
  }], [{
    key: "bindMethods",
    value: function bindMethods(obj) {
      bindMethodsFromProto(obj);
    }
  }]);

  return StatedLibBase;
}();

function createStatedLib(initialState, methodsOrGetMethods, opts) {
  var base = new StatedLibBase(initialState, opts);
  bindMethodsFromProto(base);
  var methods = typeof methodsOrGetMethods === 'function' ? methodsOrGetMethods(base) : methodsOrGetMethods;
  var obj = {
    get state() {
      return this.stateEvent$.value.state;
    }

  };
  Object.assign(obj, base);
  Object.keys(methods).forEach(function (method) {
    if (typeof methods[method] === 'function') {
      obj[method] = methods[method].bind(obj);
    }
  }); // @ts-ignore

  return obj;
}

export default StatedLibBase;
export { bindMethodsFromProto, StatedLibBase, createStatedLib };
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