# Structs
LineContext is base context that has Event type properties.
LineTextMessageContext embedded Context and add TextMessage type properties.
# Interfaces
LineBotClient mimics line-bot-sdk-go Client.
LineBotPushMessageCall mimics line-bot-sdk-go ReplyMessageCall.
LineCommand is interface for line command.
LineCommandMapper is mapper that returns LineCommandBuilder.
LineService is our line service interface that defines function that needs to be implemented.
# Type aliases
LineCommandBuilder is builder function to generate command processor.