Simple Go library for typed errors creation

Overview

go-typed-errors

Why this repo was created?

Main reason was to create additional methods for better error typing support.

Why not to use errors.As and custom structs?

Who says I'm not using them? :)

Features

  • xerrors.Wrapper support
  • errors.Is support
  • errors.As abandoned
  • #WithArgs support to add context arguments for error message, while errors.Is still working
  • Errors as constants
  • Cool IDE highlighting, as type based on strings
  • ... Ask for new features.

Compare

(from go-socks4 source code)

	// complex types definitions somewhere in other place...
	var socksErr socks4.Error
	if err != nil && errors.As(err, &socksErr) {
		switch {
		case socksErr.Equal(socks4.ErrIdentRequired):
		default:
			t.Error(err)
		}
	} else if err != nil {
		t.Error(err)
	}

With

	const (
		ErrIdentRequired = typedErrors.String("socks4 server require valid identd: %v")
	)

	// skip ErrIdentRequired error type
	if err != nil && !errors.Is(err, socks4.ErrIdentRequired) {
		t.Error(err)
	}
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