angular2/es6/dev/src/router/rules/route_handlers/async_route_handler.js

Angular 2 - a web framework for modern web apps

import { isPresent } from 'angular2/src/facade/lang';
import { RouteData, BLANK_ROUTE_DATA } from '../../instruction';
export class AsyncRouteHandler {
    constructor(_loader, data = null) {
        this._loader = _loader;
        /** @internal */
        this._resolvedComponent = null;
        this.data = isPresent(data) ? new RouteData(data) : BLANK_ROUTE_DATA;
    }
    resolveComponentType() {
        if (isPresent(this._resolvedComponent)) {
            return this._resolvedComponent;
        }
        return this._resolvedComponent = this._loader().then((componentType) => {
            this.componentType = componentType;
            return componentType;
        });
    }
}
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