void line(string $string, string $style = null, null|int|string $verbosity = null)
string|array argument(string $key = null) Get the value of a command argument
void question(string $string, null|int|string $verbosity = null) Write
void warn(string $string, null|int|string $verbosity = null) Write a string
void error(string $string) Write a string as error output.
void info(string $string, null|int|string $verbosity = null) Write a string
OutputInterface getOutput() Get the output implementation.
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