extensions/typescript-language-features/src/utils/configuration.ts/toString
	export function toString(value: TsServerLogLevel): string {
		switch (value) {
			case TsServerLogLevel.Normal:
				return 'normal';
			case TsServerLogLevel.Terse:
				return 'terse';
			case TsServerLogLevel.Verbose:
				return 'verbose';
			case TsServerLogLevel.Off:
			default:
				return 'off';
		}
	}