MyApp.Cldr.Message.format

You're seeing just the macro format, go back to MyApp.Cldr.Message module for more information.
Link to this macro

format(message, bindings \\ [], options \\ [])

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Formats an ICU message

This macro parses the message at compile time in order to optimize performance a runtime.

See Cldr.Message.format/3 for details on the arguments and options