todo.js

    const TodoFilterChecker = Record({
        text: String,
    });
    type TodoFilter = Static<typeof TodoFilterChecker>;
    
    app.get("/todo/", async function (req: Request<any, any, any, TodoFilter>, res: Response) {
        const a = TodoFilterChecker.check(req.query);

        const result = await getTodos(a.text);
        res.json(result);
    });