[REQ] [typescript-fetch] Make code compile with "erasableSyntaxOnly": true

[tomsontom]

Describe the solution you'd like

It would be nice if the generated code could run without transpilation (eg directly executing it in node). Since Typescript 5.8. there's a compiler option to enforce this named "erasableSyntaxOnly". See https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-8.html#the---erasablesyntaxonly-option

It looks like the only problem in the generated code patterns like the following

constructor(private configuration: ConfigurationParameters = {}) {}

in the runtime.ts.

Describe alternatives you've considered

The only possible solution is to patch the runtime manually.

Additional context

As outlined above if the generated code passes "erasableSyntaxOnly": true it is possible to run it directly on NodeJS, removing the need to transpile it.