I encountered a bug where I get a bug under very specific circumstances:

• Only applies to CJS
• when minify is enabled
• when spliting is enabled
• when there is code before and after calling super() in the constructor
• when there is a field that is initialized on declaration (and not in the constructor)

Source

// src/index.ts
class Parent {
  constructor() {}
}

class Feature {
  constructor() {}
}

export class Child extends Parent {
  feature = new Feature();

  constructor() {
    console.log("before");

    super();

    console.log("after");
  }
}

Result

constructor(){console.log("before"),super();_class.prototype.__init.call(this);,console.log("after")}
                                                                               ^

Error (when using the built code)

SyntaxError: Unexpected token ','

Reproduction

• Download and unpack super-bug.zip
• pnpm install
• pnpm run build
• Open dist/index.js

Context

I found this bug while working on faker-js/faker#2838

• faker-js/faker#2838