├── src
    ├── main.ts
    └── event-bus
    │   └── event-bus.ts
├── package.json
└── tsconfig.json


/src/main.ts:
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 1 | import { EventBus } from './event-bus/event-bus';
 2 | 
 3 | const registry = EventBus.getInstance().register('hello-world', (name: string) => {
 4 |     if(name)
 5 |         console.log('Hello ' + name);
 6 |     else 
 7 |         console.log('Hello world');
 8 | });
 9 | 
10 | 
11 | EventBus.getInstance().dispatch<string>('hello-world', 'Luis');
12 | EventBus.getInstance().dispatch<string>('hello-world');
13 | 
14 | registry.unregister();
15 | EventBus.getInstance().dispatch<string>('hello-world');
16 | 
17 | 
18 | 


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/package.json:
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 1 | {
 2 |   "name": "event-bus-typescript",
 3 |   "version": "1.0.0",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "start": "tsc && node dist/main.js"
 8 |   },
 9 |   "repository": {
10 |     "type": "git",
11 |     "url": "git+https://github.com/luixaviles/event-bus-typescript.git"
12 |   },
13 |   "keywords": [],
14 |   "author": "",
15 |   "license": "MIT",
16 |   "bugs": {
17 |     "url": "https://github.com/luixaviles/event-bus-typescript/issues"
18 |   },
19 |   "homepage": "https://github.com/luixaviles/event-bus-typescript#readme"
20 | }
21 | 


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/tsconfig.json:
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 1 | {
 2 |   "compilerOptions": {
 3 |     "target": "esnext",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
 4 |     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
 5 |     "outDir": "./dist",                        /* Redirect output structure to the directory. */
 6 |     "strict": true,                           /* Enable all strict type-checking options. */
 7 |     "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
 8 |     "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
 9 |   }
10 | }
11 | 


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/src/event-bus/event-bus.ts:
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 1 | export interface Registry {
 2 |   unregister: () => void;
 3 | }
 4 | 
 5 | export interface Callable {
 6 |   [key: string]: Function;
 7 | }
 8 | 
 9 | export interface Subscriber {
10 |   [key: string]: Callable;
11 | }
12 | 
13 | export interface IEventBus {
14 |   dispatch<T>(event: string, arg?: T): void;
15 |   register(event: string, callback: Function): Registry;
16 | }
17 | 
18 | export class EventBus implements IEventBus {
19 |   private subscribers: Subscriber;
20 |   private static nextId = 0;
21 |   private static instance?: EventBus = undefined;
22 | 
23 |   private constructor() {
24 |     this.subscribers = {};
25 |   }
26 | 
27 |   public static getInstance(): EventBus {
28 |     if (this.instance === undefined) {
29 |       this.instance = new EventBus();
30 |     }
31 | 
32 |     return this.instance;
33 |   }
34 | 
35 |   public dispatch<T>(event: string, arg?: T): void {
36 |     const subscriber = this.subscribers[event];
37 | 
38 |     if (subscriber === undefined) {
39 |       return;
40 |     }
41 | 
42 |     Object.keys(subscriber).forEach((key) => subscriber[key](arg));
43 |   }
44 | 
45 |   public register(event: string, callback: Function): Registry {
46 |     const id = this.getNextId();
47 |     if (!this.subscribers[event]) this.subscribers[event] = {};
48 | 
49 |     this.subscribers[event][id] = callback;
50 | 
51 |     return {
52 |       unregister: () => {
53 |         delete this.subscribers[event][id];
54 |         if (Object.keys(this.subscribers[event]).length === 0)
55 |           delete this.subscribers[event];
56 |       },
57 |     };
58 |   }
59 | 
60 |   private getNextId(): number {
61 |     return EventBus.nextId++;
62 |   }
63 | }
64 | 


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