extensions/typescript-language-features/src/utils/configuration.ts/BaseServiceConfigurationProvider/readTsServerLogLevel
class BaseServiceConfigurationProvider:	protected readTsServerLogLevel(configuration: vscode.WorkspaceConfiguration): TsServerLogLevel {
		const setting = configuration.get<string>('typescript.tsserver.log', 'off');
		return TsServerLogLevel.fromString(setting);
	}