Bug when bundling commonjs when there is code before super()

[ST-DDT]

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

• feat: introduce FakerCore faker-js/faker#2838

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[gregnr]

Also experiencing this one, though for us this occurs even when there is no code before super() (but there is code after). Temporary work around is moving class field initialization to inside the constructor (see supabase-community/pg-gateway#24).