fix: Include extended compiler options in tsconfig

[marikaner]

This was hardcoded and I am quite sure this was a bug in our generator.

[davidkna-sap]

LGTM, but consider using something like this instead:

import { readConfigFile, parseJsonConfigFileContent, sys } from 'typescript';

function readCompilerOptions(pathToTsConfig: string): CompilerOptions {
  const fullPath = parse(pathToTsConfig).ext === '.json'
    ? pathToTsConfig
    : resolve(pathToTsConfig, 'tsconfig.json');

  const { config, error } = readConfigFile(fullPath, sys.readFile);
  if (error) throw new Error(/* format diagnostic */);

  const result = parseJsonConfigFileContent(config, sys, parse(fullPath).dir);
  return result.options;  // already fully resolved, numeric enums, extends resolved
}```

[marikaner]

LGTM, but consider using something like this instead:

import { readConfigFile, parseJsonConfigFileContent, sys } from 'typescript';

function readCompilerOptions(pathToTsConfig: string): CompilerOptions {
  const fullPath = parse(pathToTsConfig).ext === '.json'
    ? pathToTsConfig
    : resolve(pathToTsConfig, 'tsconfig.json');

  const { config, error } = readConfigFile(fullPath, sys.readFile);
  if (error) throw new Error(/* format diagnostic */);

  const result = parseJsonConfigFileContent(config, sys, parse(fullPath).dir);
  return result.options;  // already fully resolved, numeric enums, extends resolved
}```

good idea. I will try it on a follow up pr.