raid-addons/lib/patch.js

Add-ons functions for use with Raid

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

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; }

// Will usually provide back the state object, but, if this is an arc
// being patched then it will need to pass back a function
var generateState = function generateState(state, key) {
  if (typeof state === 'function') {
    return function (selector) {
      return selector ? selector(state()[key]) : state()[key];
    };
  }

  return state[key];
}; // Provides selected key to update and applies back to state


var select = function select(key, update) {
  return function (state, event) {
    return _objectSpread({}, state, _defineProperty({}, key, update(generateState(state, key), event)));
  };
}; // Returns a function accepting an update


var createPatch = function createPatch(key) {
  return function (update) {
    return select(key, update);
  };
}; // Allow fixed arity for easier composition


var patch = function patch(key, update) {
  if (!key) {
    throw new Error('[raid:patch] key must be supplied');
  }

  if (!update || typeof update !== 'function') {
    return createPatch(key);
  }

  return select(key, update);
};

var _default = patch;
exports["default"] = _default;