Nostrum.Api.get_voice_region

You're seeing just the function get_voice_region, go back to Nostrum.Api module for more information.
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get_voice_region(guild_id)

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Specs

get_voice_region(integer()) :: error() | {:ok, [Nostrum.Struct.VoiceRegion.t()]}

Gets a list of voice regions for the guild.

Guild to get voice regions for is specified by guild_id.