preact-router-lazy/dist/index.js

Async route component for preact-router

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('preact')) :
	typeof define === 'function' && define.amd ? define(['preact'], factory) :
	(global['preact-router-lazy'] = factory(global.preact));
}(this, (function (preact) { 'use strict';

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { 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 _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var AsyncRoute = function (_Component) {
  _inherits(AsyncRoute, _Component);

  function AsyncRoute() {
    _classCallCheck(this, AsyncRoute);

    var _this = _possibleConstructorReturn(this, _Component.call(this));

    _this.state = {
      componentData: null
    };
    return _this;
  }

  AsyncRoute.prototype.loadComponent = function loadComponent() {
    var _this2 = this;

    if (this.props.component) {
      return this.setState({
        componentData: this.props.component
      });
    }
    var componentData = this.props.getComponent(this.props.url, function (_ref) {
      var component = _ref.component;

      // Named param for making callback future proof
      if (component) {
        _this2.setState({
          componentData: component
        });
      }
    }, _extends({}, this.props, this.props.matches));

    // In case returned value was a promise
    if (componentData && componentData.then) {
      // IIFE to check if a later ending promise was creating a race condition
      // Check test case for more info
      (function (url) {
        componentData.then(function (component) {
          if (url !== _this2.props.url) {
            _this2.setState({ componentData: null }, function () {
              _this2.loadComponent();
            });
            return;
          }
          _this2.setState({
            componentData: component
          });
        });
      })(this.props.url);
    }
  };

  AsyncRoute.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {
    var _this3 = this;

    if (this.props.path && this.props.path !== nextProps.path) {
      this.setState({
        componentData: null
      }, function () {
        _this3.loadComponent();
      });
    }
  };

  AsyncRoute.prototype.componentWillMount = function componentWillMount() {
    this.loadComponent();
  };

  AsyncRoute.prototype.render = function render() {
    if (this.state.componentData) {
      return preact.h(this.state.componentData, this.props);
    } else if (this.props.loading) {
      var loadingComponent = this.props.loading();
      return loadingComponent;
    }
    return null;
  };

  return AsyncRoute;
}(preact.Component);

return AsyncRoute;

})));
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