Hello @Carsten_HB,
We support Typescript 5.8 in the latest release of SonarJS, which will be included in the very next release of SonarQube.
In the meantime, you can use another tsconfig.json which is compatible with 5.7. A standard workaround is to name it tsconfig.sonar.json
and point to it using the sonar property
sonar.typescript.tsconfigPaths=path/to/tsconfig.sonar.json
Cheers,
Victor