Protected ReadonlyfileProtected ReadonlypendingProtected ReadonlysnippetsProtectedisProtectedloadProtectedloadProtectedparseProvide completion items for the given position and document.
OptionalresolveGiven a completion item fill in more data, like CompletionItem.documentation doc-comment or CompletionItem.detail details.
The editor will only resolve a completion item once.
should NOT throw to prevent load errors on suggest