src/vs/workbench/api/common/extHostUriTransformerService.ts/URITransformerService/constructor
class URITransformerService:	constructor(delegate: IURITransformer | null) {
		if (!delegate) {
			this.transformIncoming = arg => arg;
			this.transformOutgoing = arg => arg;
			this.transformOutgoingURI = arg => arg;
			this.transformOutgoingScheme = arg => arg;
		} else {
			this.transformIncoming = delegate.transformIncoming.bind(delegate);
			this.transformOutgoing = delegate.transformOutgoing.bind(delegate);
			this.transformOutgoingURI = delegate.transformOutgoingURI.bind(delegate);
			this.transformOutgoingScheme = delegate.transformOutgoingScheme.bind(delegate);
		}
	}