[Bug] Transformer step fails when TS major/minor version is 0

[chcatf]

Hello,

There is an issue with src/transformer.ts, when the TypeScript version is parsed if the major or minor version is 0 it will throw an error due to 0 being falsy since it's mapped to a number, see here

While this may not be an issue if support for 5.0.x is dropped, it presumably would be once 6.0 is used.