export interface FoldingRangeProvider {

		/**
		 * An optional event to signal that the folding ranges from this provider have changed.
		 */
		onDidChangeFoldingRanges?: Event<void>;

		/**
		 * Returns a list of folding ranges or null and undefined if the provider
		 * does not want to participate or was cancelled.
		 * @param document The document in which the command was invoked.
		 * @param context Additional context information (for future use)
		 * @param token A cancellation token.
		 */
		provideFoldingRanges(document: TextDocument, context: FoldingContext, token: CancellationToken): ProviderResult<FoldingRange[]>;
	}