Implement on demand client async fragments

Author: tolgacesur

package-lock.json

@@ -1,7 +1,7 @@
 {
   "name": "@puzzle-js/client-lib",
   "main": "dist/index.js",
-  "version": "1.4.6",
+  "version": "1.5.0",
   "author": "<emre.kul@trendyol.com>",
   "license": "MIT",
   "repository": {

package.json

@@ -31,13 +31,14 @@ export class Core extends Module {
       });
     }
 
-    const forcedFragments = Core.__pageConfiguration.fragments.filter(i => i.clientAsync && i.clientAsyncForce);
+    const fragments = Core.__pageConfiguration.fragments.filter(i => !i.onDemand);
+    const forcedFragments = fragments.filter(i => i.clientAsync && i.clientAsyncForce);
     if (forcedFragments.length) {
       forcedFragments.forEach(fragment => Core.asyncLoadFragment(fragment));
     }
 
     if (this.isIntersectionObserverSupported()) {
-      const asyncFragments = Core.__pageConfiguration.fragments.some(i => i.clientAsync);
+      const asyncFragments = fragments.some(i => i.clientAsync);
 
       if (asyncFragments) {
         this.observer = new IntersectionObserver(this.onIntersection.bind(this));
@@ -84,7 +85,7 @@ export class Core extends Module {
 
   @on(EVENT.ON_PAGE_LOAD)
   static asyncComponentRender() {
-    const asyncFragments = Core.__pageConfiguration.fragments.filter(i => i.clientAsync);
+    const asyncFragments = Core.__pageConfiguration.fragments.filter(i => i.clientAsync && !i.onDemand);
 
     asyncFragments.forEach(fragment => {
       if (this.observer) {
@@ -100,7 +101,7 @@ export class Core extends Module {
   }
 
   private static asyncLoadFragment(fragment: IPageFragmentConfig) {
-    if (fragment.asyncLoaded) return;
+    if (fragment.asyncLoaded) return Promise.resolve();
     fragment.asyncLoaded = true;
     const queryString = this.prepareQueryString(fragment.attributes);
     const key = `${fragment.source}${window.location.pathname}${queryString}`;
@@ -302,6 +303,8 @@ export class Core extends Module {
         return this.asyncLoadFragment(fragment);
       }
     }
+
+    return Promise.resolve();
   }
 
   private static isIntersectionObserverSupported() {

src/core.ts

@@ -32,6 +32,7 @@ export interface IPageFragmentConfig {
   chunked: boolean;
   clientAsync: boolean;
   clientAsyncForce: boolean | undefined;
+  onDemand: boolean | undefined;
   asyncDecentralized: boolean;
   attributes: { [name: string]: string };
   source: string | undefined;

src/types.ts

@@ -4,7 +4,6 @@ import {PuzzleJs} from "../src/puzzle";
 import {Core} from "../src/core";
 import {createPageLibConfiguration} from "./mock";
 import sinon, { SinonStub } from "sinon";
-import {AssetHelper} from "../src/assetHelper";
 import * as faker from "faker";
 import {IPageLibAsset, IPageLibConfiguration, IPageLibDependency} from "../src/types";
 import {RESOURCE_LOADING_TYPE, RESOURCE_TYPE} from "../src/enums";
@@ -203,6 +202,7 @@ describe('Module - Core', () => {
         chunked: true,
         clientAsync: true,
         clientAsyncForce: undefined,
+        onDemand: undefined,
         source: undefined,
         asyncDecentralized: false
       }],
@@ -256,6 +256,7 @@ describe('Module - Core', () => {
         chunked: true,
         clientAsync: true,
         clientAsyncForce: true,
+        onDemand: undefined,
         source: undefined,
         asyncDecentralized: false
       }],
@@ -278,4 +279,66 @@ describe('Module - Core', () => {
     expect(fetchStub.getCall(0).lastArg.headers).to.haveOwnProperty("originalurl");
     expect(stubAsyncRenderResponse.calledOnce).to.eq(true);
   });
+
+  it('should return a promise object that is resolved if fragment does not exist', () => {
+    const assets = [] as IPageLibAsset[];
+    const dependencies = [] as IPageLibDependency[];
+    const config = {
+      dependencies,
+      assets,
+      fragments: [],
+      page: 'page',
+      peers: []
+    } as IPageLibConfiguration;
+
+    Core.config(JSON.stringify(config));
+    const result = Core.renderAsyncFragment('test');
+    
+    expect(result).to.be.a('promise');
+  });
+
+  it('should return a promise object that is resolved if fragment is asyncLoaded', () => {
+    const assets = [
+      {
+        name: 'bundle1',
+        dependent: ['vendor1'],
+        preLoaded: false,
+        link: 'bundle1.js',
+        fragment: 'test',
+        loadMethod: RESOURCE_LOADING_TYPE.ON_PAGE_RENDER,
+        type: RESOURCE_TYPE.JS
+      }
+    ] as IPageLibAsset[];
+    const dependencies = [
+      {
+        name: 'vendor1',
+        link: 'vendor1.js',
+        preLoaded: false
+      }
+    ] as IPageLibDependency[];
+    const config = {
+      dependencies,
+      assets,
+      fragments: [{
+        name: 'test',
+        attributes: {
+          if: "false"
+        },
+        chunked: true,
+        clientAsync: true,
+        clientAsyncForce: undefined,
+        onDemand: undefined,
+        source: undefined,
+        asyncDecentralized: false,
+        asyncLoaded: true
+      }],
+      page: 'page',
+      peers: []
+    } as IPageLibConfiguration;
+
+    Core.config(JSON.stringify(config));
+    const result = Core.renderAsyncFragment('test');
+    
+    expect(result).to.be.a('promise');
+  });
 });