extensions/typescript-language-features/src/utils/largeProjectStatus.ts/onConfigureExcludesSelected
function onConfigureExcludesSelected(
	client: ITypeScriptServiceClient,
	configFileName: string
) {
	if (!isImplicitProjectConfigFile(configFileName)) {
		vscode.workspace.openTextDocument(configFileName)
			.then(vscode.window.showTextDocument);
	} else {
		const root = client.getWorkspaceRootForResource(vscode.Uri.file(configFileName));
		if (root) {
			openOrCreateConfig(
				/tsconfig\.?.*\.json/.test(configFileName) ? ProjectType.TypeScript : ProjectType.JavaScript,
				root,
				client.configuration);
		}
	}
}