Elixir - possible to combine custom map types?

Map.merge/2 won’t work for specs, it’s not a map actually, it’s just a similar syntax.

One might achieve the desired result with a bit of metaprogramming.

defmodule Test do
  @map_a_type quote(do: [foo: String.t(), bar: String.t()])

  @typep map_a :: %{unquote_splicing(@map_a_type)}
  @typep map_b :: %{unquote_splicing(@map_a_type), baz: String.t()}
end

Elixir - possible to combine custom map types?

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