Postgrex.Extension.matching

You're seeing just the callback matching, go back to Postgrex.Extension module for more information.

Specs

matching(state()) :: [
  type: String.t(),
  send: String.t(),
  receive: String.t(),
  input: String.t(),
  output: String.t()
]

Specifies the types the extension matches, see Postgrex.TypeInfo for specification of the fields.