EasyError is a lightweight TypeScript library for handling Either types and custom errors design for express. manage your errors without importing or drilling with your res :)
npm install easy-error-tsimport { EasyCustomError, EasyLeft, EasyRight, EasyEither, left, right } from 'easy-error-ts';const leftValue: EasyLeft<number> = left(42);const rightValue: EasyRight<EasyCustomError> = right(500, 'Internal Server Error');easy to use contains only an EasyEither type for your return and a left and right functions the left is for the good result and the right is for the error. EasyEither is only a type for your return or others.
const fetchMyData = async () : Promise<EasyEither<unknown>> => {
try {
const req = await fetch(
`https://toto.com/api`
);
if (!req.ok) {
return right(500 , `Error message`)
}
return left(await req.json())
} catch (error) {
return right(500 , `Error message`)
}
}
export default async function handler(
req: NextApiRequest,
res: NextApiResponse<unknown | CustomError>
) {
const dataOrError = await fetchMyData();
const [data, error] = dataOrError;
return data !== undefined
? res.status(200).json({ data })
: res.status(error?.code ?? 500).json(error ?? { message: 'Internal Server Error' });
}We welcome contributions! Feel free to open issues or pull requests.
This project is licensed under the MIT License - see the LICENSE.md file for details.