extensions/npm/src/features/jsonContributions.ts/JSONCompletionItemProvider/resolveCompletionItem
class JSONCompletionItemProvider:	public resolveCompletionItem(item: CompletionItem, _token: CancellationToken): Thenable<CompletionItem | null> {
		if (this.jsonContribution.resolveSuggestion) {
			const resolver = this.jsonContribution.resolveSuggestion(this.lastResource, item);
			if (resolver) {
				return resolver;
			}
		}
		return Promise.resolve(item);
	}