src/vs/workbench/api/common/extHostLanguageFeatures.ts/ExtHostLanguageFeatures/_transformScheme
class ExtHostLanguageFeatures:	private _transformScheme(scheme: string | undefined): string | undefined {
		if (this._uriTransformer && typeof scheme === 'string') {
			return this._uriTransformer.transformOutgoingScheme(scheme);
		}
		return scheme;
	}