You are using older version of TypeScript (below 4.0.5), type interpolation was introduced from version 4.1.5 onwards.

https://www.typescriptlang.org/play/?ts=4.1.5#code/KYDwDg9gTgLgBDAnmYcBiAbUARAllYAYxlwgDs4BeOAciggHca4AfW+hgWgIDdgoAzsGZsahCBgCuAWzIja4qbO7A+g4QG4AUKEiwEyVJlAB1KAEMwVWmUYWw8mg3uPnllWqE1tu6PCQo6FggmIzWAAYAJADexiB4BMSkZAC+cDFxZpYp4dpAA

You can change version on the left to 4.0.5 to see the same error.

For the best results, you can add typescript as a dev dependency in your project or install new version of typescript globally on your machine.