OutputInterface getOutput() Get the output implementation.
void warn(string $string) Write a string as warning output.
void error(string $string, null|int|string $verbosity = null) Write a string
bool hasArgument(string|int $name) Determine if the given argument is present
string secret(string $question, bool $fallback = true) Prompt the user
void line(string $string, string $style = null, null|int|string $verbosity = null)
bool confirm(string $question, bool $default = false) Confirm a question
string|array option(string $key = null) Get the value of a command option
bool hasOption(string $name) Determine if the given option is present.
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