customError

The customError function creates a custom error class with a specific name, making it easier to identify different types of errors in your application.

Syntax

customError(name: string): typeof Error;

Parameters

Name	Type	Description
name	string	The name to assign to the error class

Returns

Type	Description
typeof Error	A class extending Error with the specified custom name

Examples

const NotFoundError = customError("NotFoundError");
throw new NotFoundError("Resource not found");
// => throws an error with name "NotFoundError" and message "Resource not found"

const AuthError = customError("AuthError");
throw new AuthError("Access denied");
// => throws an error with name "AuthError" and message "Access denied"

Notes

• The generated class inherits from Error and sets the name according to the provided parameter.
• Uses Error.captureStackTrace (when available) to remove the function itself from the stack trace, making debugging easier.
• Useful for creating different error types without repeating boilerplate code.

References

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error