I am using tsc to execute the following program:

enum e51 {
    HTML = 'html',
    JSON = 'json',
    CSV = 'csv',
}

export default ResponseType;

In the program I provided,”ResponseType” is undefined,and also is not referenced in other files.As a result, tsc did not report any errors. I want to know, is it because this identifier is undefined and unused that tsc ignored this line of code when translating?