supportedLanguages
An array of language identifiers that are supported by this controller. Any language identifier from {@linkcode languages.getLanguages getLanguages} is possible. When falsy all languages are supported.
Samples:
// support JavaScript and TypeScript
myController.supportedLanguages = ['javascript', 'typescript']
// support all languages
myController.supportedLanguages = undefined; // falsy
myController.supportedLanguages = []; // falsyContent copied to clipboard