Change Diagnostic.code to 'string | number'

I'm writing a LanguageService plugin for TypeScript that returns custom diagnostics. A Diagnostic needs to have a code property of type number.

I don't have a number. Instead I can provide a string that represents the name of the rule producing the diagnostic. In addition a random number I would choose looks quite ugly in the tooltip VSCode displays for the Diagnostic.

I know TypeScript only ever creates Diagnostics with numeric code, but it's too limiting for plugins.
I looked it up and the LanguageServer protocol specifies it as code?: number | string.

My current workaround is to use a type assertion. Until now nothing bad has happened.

Beginne damit, den Typ Diagnostic und die LanguageService plugin API zu finden, und vergleiche dann die aktuelle Anforderung an numerische Codes mit der in der Issue erwähnten Definition des Language Server Protocol. Prüfe, wie Diagnosecodes verwendet und angezeigt werden, und berücksichtige vorhandene numerische Diagnosen, bevor du feststellst, ob String-Codes akzeptiert werden können, ohne das aktuelle Verhalten zu beeinträchtigen.