Task: Add reflection metadata for decorators and add basic implements for controller and express application and constants and app

src/application.ts

@@ -0,0 +1,52 @@
+import express, { Application as ExpressApp, Handler } from "express"
+import { controllers } from "./controller"
+import { RouteHandler } from "./decorators/handlers.decorator"
+import { MetadataKeys } from "./constants/metadata.keys"
+
+class Application {
+    private readonly _instance: ExpressApp
+
+    get instance(): ExpressApp {
+        return this._instance
+    }
+
+    constructor() {
+        this._instance = express()
+        this.registerRoutes()
+    }
+
+    private registerRoutes(): void {
+        const info: Array<{ api: string; handler: string }> = []
+
+        controllers.forEach((controller) => {
+            const controllerInstance: { [handlerName: string]: Handler } =
+                new controller() as any
+            const basePath: string = Reflect.getMetadata(
+                MetadataKeys.BASE_PATH,
+                controller
+            )
+            const routers: RouteHandler[] = Reflect.getMetadata(
+                MetadataKeys.ROUTERS,
+                controller
+            )
+            const exRouter = express.Router()
+
+            routers.forEach(({ method, path, handlerName }) => {
+                exRouter[method](
+                    path,
+                    controllerInstance[String(handlerName)]
+                ).bind(controllerInstance)
+                info.push({
+                    api: `${method.toLocaleUpperCase()} ${basePath + path}`,
+                    handler: `${controller.name}.${String(handlerName)}`,
+                })
+            })
+
+            this._instance.use(basePath, exRouter)
+        })
+
+        console.table(info)
+    }
+}
+
+export default new Application()