Setup eslint and enforce rules

src/http/response/JSONResponseFactory.ts

@@ -1,11 +1,11 @@
-import {ResponseFactory} from "./ResponseFactory";
-import {Request} from "../lifecycle/Request";
+import {ResponseFactory} from './ResponseFactory'
+import {Request} from '../lifecycle/Request'
 
 /**
  * Helper function to create a new JSONResponseFactory of the given value.
  * @param value
  */
-export function json(value: any): JSONResponseFactory {
+export function json(value: unknown): JSONResponseFactory {
     return new JSONResponseFactory(value)
 }
 
@@ -14,10 +14,12 @@ export function json(value: any): JSONResponseFactory {
  */
 export class JSONResponseFactory extends ResponseFactory {
     constructor(
-        public readonly value: any
-    ) { super() }
+        public readonly value: unknown,
+    ) {
+        super()
+    }
 
-    public async write(request: Request) {
+    public async write(request: Request): Promise<Request> {
         request = await super.write(request)
         request.response.setHeader('Content-Type', 'application/json')
         request.response.body = JSON.stringify(this.value)