ErrorGuidesCustom Errors

Custom Errors

Last updated:

Creating Custom Errors

Basic Custom Error

import { VisulimaError } from "@visulima/error";

class ValidationError extends VisulimaError {
    constructor(message: string, field?: string) {
        super({
            name: "ValidationError",
            message,
        });

        if (field) {
            this.hint = `Field '${field}' is invalid`;
        }
    }
}

With Metadata

class APIError extends VisulimaError {
    public statusCode: number;
    public endpoint: string;

    constructor(message: string, statusCode: number, endpoint: string) {
        super({
            name: "APIError",
            message,
        });

        this.statusCode = statusCode;
        this.endpoint = endpoint;
    }
}

const error = new APIError("Request failed", 500, "/api/users");

Error Chains

const dbError = new Error("Connection refused");
const appError = new VisulimaError({
    name: "ApplicationError",
    message: "Failed to fetch user",
    cause: dbError,
});

throw appError;
Support

Contribute to our work and keep us going

Community is the heart of open source. The success of our packages wouldn't be possible without the incredible contributions of users, testers, and developers who collaborate with us every day.Want to get involved? Here are some tips on how you can make a meaningful impact on our open source projects.

Ready to help us out?

Be sure to check out the package's contribution guidelines first. They'll walk you through the process on how to properly submit an issue or pull request to our repositories.

Submit a pull request

Found something to improve? Fork the repo, make your changes, and open a PR. We review every contribution and provide feedback to help you get merged.

Good first issues

Simple issues suited for people new to open source development, and often a good place to start working on a package.
View good first issues