extensions/markdown-language-features/src/languageFeatures/references.ts/MdReferencesProvider/provideReferences
class MdReferencesProvider:	async provideReferences(document: SkinnyTextDocument, position: vscode.Position, context: vscode.ReferenceContext, token: vscode.CancellationToken): Promise<vscode.Location[] | undefined> {
		const allRefs = await this.getAllReferencesAtPosition(document, position, token);

		return allRefs
			.filter(ref => context.includeDeclaration || !ref.isDefinition)
			.map(ref => ref.location);
	}