src/vs/workbench/services/configuration/browser/configuration.ts/FileServiceBasedWorkspaceConfiguration/resolveContent
class FileServiceBasedWorkspaceConfiguration:	async resolveContent(workspaceIdentifier: IWorkspaceIdentifier): Promise<string> {
		const content = await this.fileService.readFile(workspaceIdentifier.configPath);
		return content.value.toString();
	}