todo.ts

function todoRoutes(todoService: TodoService): Handler {
  return router([
    bind("/{id}", router([
      bind(HttpMethod.GET, async request => {
        const id = requiredPathParam(request, "id");
        const todoEntry = todoService.fetch(id);
        return (todoEntry)
          ? { statusCode: 200, body: JSON.stringify(todoEntry) }
          : { statusCode: 404, body: '' };
      }),
      bind(HttpMethod.PUT, async (request) => {
        const id = requiredPathParam(request, "id");
        const todoEntry: TodoEntry = jsonBody(request);
        todoService.save(id, todoEntry);
        return { statusCode: 201, body: JSON.stringify(todoEntry) };
      }),
      bind(HttpMethod.DELETE, async (request) => {
        const id = requiredPathParam(request, "id");
        const deletedTodo = todoService.delete(id);
        return (deletedTodo)
          ? { statusCode: 200, body: JSON.stringify(deletedTodo) }
          : { statusCode: 404, body: '' };
      })
    ])),
    bind(["/", HttpMethod.GET], async () => ({ statusCode: 200, body: JSON.stringify(todoService.fetchAll(), null, 2) })),
      bind(["/", HttpMethod.POST], async (request) => {
        const todoEntry: TodoEntry = jsonBody(request);
        return { statusCode: 200, body: JSON.stringify(todoService.save(undefined, todoEntry)) };
      })

  ]);
}