extensions/typescript-language-features/src/utils/tracer.ts/fromString
	export function fromString(value: string): Trace {
		value = value.toLowerCase();
		switch (value) {
			case 'off':
				return Trace.Off;
			case 'messages':
				return Trace.Messages;
			case 'verbose':
				return Trace.Verbose;
			default:
				return Trace.Off;
		}
	}