in src/tms_service.ts [208:221]
public static transformLanguageProperty(
layer: LayerSpecification,
lang: string
): DataDrivenPropertyValueSpecification<FormattedSpecification> | undefined {
const supportedLang = this.SupportedLanguages.find((l) => l.key === lang);
if (layer.type === 'symbol' && layer.layout !== undefined && supportedLang !== undefined) {
const omtLang = supportedLang.omt;
const textField = layer.layout['text-field'];
if (textField && typeof textField === 'string') {
return TMSService._getTextField(textField, omtLang);
}
}
return;
}