xstate/lib/Actor.js

Finite State Machines and Statecharts for the Modern Web.

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var _tslib = require('./_virtual/_tslib.js');
var utils = require('./utils.js');
var serviceScope = require('./serviceScope.js');

function createNullActor(id) {
  var _a;

  return _a = {
    id: id,
    send: function () {
      return void 0;
    },
    subscribe: function () {
      return {
        unsubscribe: function () {
          return void 0;
        }
      };
    },
    getSnapshot: function () {
      return undefined;
    },
    toJSON: function () {
      return {
        id: id
      };
    }
  }, _a[utils.symbolObservable] = function () {
    return this;
  }, _a;
}
/**
 * Creates a deferred actor that is able to be invoked given the provided
 * invocation information in its `.meta` value.
 *
 * @param invokeDefinition The meta information needed to invoke the actor.
 */

function createInvocableActor(invokeDefinition, machine, context, _event) {
  var _a;

  var invokeSrc = utils.toInvokeSource(invokeDefinition.src);
  var serviceCreator = (_a = machine === null || machine === void 0 ? void 0 : machine.options.services) === null || _a === void 0 ? void 0 : _a[invokeSrc.type];
  var resolvedData = invokeDefinition.data ? utils.mapContext(invokeDefinition.data, context, _event) : undefined;
  var tempActor = serviceCreator ? createDeferredActor(serviceCreator, invokeDefinition.id, resolvedData) : createNullActor(invokeDefinition.id); // @ts-ignore

  tempActor.meta = invokeDefinition;
  return tempActor;
}
function createDeferredActor(entity, id, data) {
  var tempActor = createNullActor(id); // @ts-ignore

  tempActor.deferred = true;

  if (utils.isMachine(entity)) {
    // "mute" the existing service scope so potential spawned actors within the `.initialState` stay deferred here
    var initialState_1 = tempActor.state = serviceScope.provide(undefined, function () {
      return (data ? entity.withContext(data) : entity).initialState;
    });

    tempActor.getSnapshot = function () {
      return initialState_1;
    };
  }

  return tempActor;
}
function isActor(item) {
  try {
    return typeof item.send === 'function';
  } catch (e) {
    return false;
  }
}
function isSpawnedActor(item) {
  return isActor(item) && 'id' in item;
} // TODO: refactor the return type, this could be written in a better way but it's best to avoid unneccessary breaking changes now

function toActorRef(actorRefLike) {
  var _a;

  return _tslib.__assign((_a = {
    subscribe: function () {
      return {
        unsubscribe: function () {
          return void 0;
        }
      };
    },
    id: 'anonymous',
    getSnapshot: function () {
      return undefined;
    }
  }, _a[utils.symbolObservable] = function () {
    return this;
  }, _a), actorRefLike);
}

exports.createDeferredActor = createDeferredActor;
exports.createInvocableActor = createInvocableActor;
exports.createNullActor = createNullActor;
exports.isActor = isActor;
exports.isSpawnedActor = isSpawnedActor;
exports.toActorRef = toActorRef;