Bylaw.Credo.Check.Elixir.NoCatchAllInWithElse (bylaw_credo v0.1.0-alpha.1)

Basics

This check has a base priority of high and works with any version of Elixir.

Explanation

Prefer explicit pattern matches in with else clauses over catch-all variables.

Examples

Each else branch should match a specific pattern so that success and failure paths are clearly separated. Avoid:

  with {:ok, user} <- fetch_user(id) do
    {:ok, user}
  else
    error -> error
  end

Prefer:

  with {:ok, user} <- fetch_user(id) do
    {:ok, user}
  else
    {:error, error} -> {:error, error}
  end

Notes

This check uses static AST analysis, so it favors clear source-level patterns over runtime behavior.

Options

This check has no check-specific options. Configure it with an empty option list.

Usage

Add this check to Credo's checks: list in .credo.exs:

%{
  configs: [
    %{
      name: "default",
      checks: [
        {Bylaw.Credo.Check.Elixir.NoCatchAllInWithElse, []}
      ]
    }
  ]
}

Check-Specific Parameters

There are no specific parameters for this check.

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.