Mr.Unforgettable
Mr.Unforgettable
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TTCTheo's Typesafe Cult
Created by Mr.Unforgettable on 11/3/2024 in #questions
What is the best way to define my own custom types definations?
I am trying to build some application with typescript. I was facing issues with some types like for example setting a status code for internal server error when I catch some error in the try block and setting ./src/controllers/admin.ts 
const handleServerError = (error: unknown | any, next: NextFunction) => {
  let errorMessage: string;

  if (error instanceof Error) {
    errorMessage = error.message;
  } else {
    errorMessage = String(error);
  }

  const err = new Error(errorMessage);
  console.error(err);
  err.httpStatusCode = 500;
  return next(err);
};
const handleServerError = (error: unknown | any, next: NextFunction) => {
  let errorMessage: string;

  if (error instanceof Error) {
    errorMessage = error.message;
  } else {
    errorMessage = String(error);
  }

  const err = new Error(errorMessage);
  console.error(err);
  err.httpStatusCode = 500;
  return next(err);
};
and using it like a call in the catch block: 
try {
} catch (error) {
  handleServerError(error, next);
}
try {
} catch (error) {
  handleServerError(error, next);
}
Since, httpStatusCode does not exists on the type Error. I solved this issue by creating ./src/types/error.d.ts 
declare global {
  interface Error {
    httpStatusCode?: number;
  }
}

export {};
declare global {
  interface Error {
    httpStatusCode?: number;
  }
}

export {};
However I have to add this defination file in my tsconfig.json { "compilerOptions": { }, "files": [ "src/types/error.d.ts", ... ] } Is there any better ergonomic way to deal with this situation?
1 replies
TTCTheo's Typesafe Cult
Created by Mr.Unforgettable on 6/30/2024 in #questions
Having difficulty with sequelize association methods.
Hey I am have a problem with the sequelize package. I am try to create an association between the two models 'User' and 'Cart'. 
User.hasOne(Cart);
Cart.belongsTo(User);
User.hasOne(Cart);
Cart.belongsTo(User);
Now in my app.ts file i am try to create some dummy user and cart. 
(async () => {
   try {
     await sequelize.sync({ force: true }); // Remove this line in production build.
     // await sequelize.sync();
 
     let user = await User.findByPk(1);
     if (!user) {
       user = await User.create({
         name: "TestSubject1",
       });
     }
 
     console.log("User created:", user);
 
     let cart = await user.createCart();
     
     console.log("Cart created:", cart);

     app.listen(PORT, () => {
       console.log(`Server running at http://localhost:${PORT}`);
     });
   } catch (error) {
     console.error("Error during Sequalize sync or user creation:", error);
   }
 })();
(async () => {
   try {
     await sequelize.sync({ force: true }); // Remove this line in production build.
     // await sequelize.sync();
 
     let user = await User.findByPk(1);
     if (!user) {
       user = await User.create({
         name: "TestSubject1",
       });
     }
 
     console.log("User created:", user);
 
     let cart = await user.createCart();
     
     console.log("Cart created:", cart);

     app.listen(PORT, () => {
       console.log(`Server running at http://localhost:${PORT}`);
     });
   } catch (error) {
     console.error("Error during Sequalize sync or user creation:", error);
   }
 })();
However, I am getting error stating "createCart" property does not exist on the type 'User'. I was expecting the hasOne or hasMany relation in sequelize to provide me with some special methods. Please correct me i am wrong and help me clearify my doubt.
1 replies