module ConfigX
  class Builder
    type source = Source | Hash[untyped, untyped] | String | Pathname | Object

    def self.load: -> Config
    def self.source: [T < Source] (source, **untyped) -> T

    def initialize: -> void

    attr_reader sources: Array[Source]


    def add_source: (source, **untyped) -> self

    def load: -> Config

    private

    def read_from_sources: -> Hash[untyped, untyped]
  end
end