extensions/typescript-language-features/src/languageFeatures/tsconfig.ts/TsconfigLinkProvider/getExtendsLink
class TsconfigLinkProvider:	private getExtendsLink(document: vscode.TextDocument, root: jsonc.Node): vscode.DocumentLink | undefined {
		const extendsNode = jsonc.findNodeAtLocation(root, ['extends']);
		if (!this.isPathValue(extendsNode)) {
			return undefined;
		}

		const extendsValue: string = extendsNode.value;
		if (extendsValue.startsWith('/')) {
			return undefined;
		}

		const args: OpenExtendsLinkCommandArgs = {
			resourceUri: document.uri,
			extendsValue: extendsValue
		};

		const link = new vscode.DocumentLink(
			this.getRange(document, extendsNode),
			vscode.Uri.parse(`command:${openExtendsLinkCommandId}?${JSON.stringify(args)}`));
		link.tooltip = localize('documentLink.tooltip', 'Follow link');
		return link;
	}