Fix resolved tsconfig

[JakeSidSmith]

https://github.com/JakeSidSmith/tsb/blob/e141111fe5ddfb9077e0691f44b59fa5e608a112/src/tsconfig.ts#L72

Your tsconfig.json module was set to "CommonJS".
You should target an ES module type e.g. "ESNext" to get the full benefits of this bundler.
We'll handle converting everything to CommonJS for you.

tsconfig.json

{
  "compilerOptions": {
    "module": "CommonJS"
  }
}

tsconfig.extends.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "module": "ESNext"
  }
}