BehavesLike

Turns a module's specs into callbacks.

Lets you state that a module behaves like another, without writing behaviour callbacks.

For example:

defmodule API do
  use BehavesLike

  @spec get(binary()) :: {:ok, any()} | {:error, any()}
  def get(id) do
    Backend.get(id)
  end
end

defmodule Backend do
  @behaviour API

  @impl true
  def get(id) do
    database().get(id)
  end
end

Installation

From Hex:

def deps do
  [
    {:behaves_like, "~> 0.1.0"}
  ]
end

Usage

Just add use BehavesLike to your module, then you can use the standard @behaviour attribute in other modules to refer to it.