Transpiling super does not handle assignment other than =

[overlookmotel]

Input:

export default {
  foo() {
    super.x += 1;
  }
}.foo;

Output:

const super$0 = {},
  foo = (super$0 => ({
    foo() {
      Reflect.set(Object.getPrototypeOf(super$0), "x", 1, this);
    }
  }).foo)(super$0);
super$0.foo = foo;
export default foo;

Reflect.set(Object.getPrototypeOf(super$0), "x", 1, this) is equivalent to super.foo = 1 not += 1.

Also not handled:

• super.foo &&= 1 (and other assignments)
• super.foo++ / --super.foo
• {x: super.foo} = {x: 1}
• [super.foo] = [1]
• for (super.foo of [1]) {}
• for (super.foo in {x: 1}) {}

+=, &&= etc assignments will exhibit incorrect behavior. All other cases listed above will throw illegal assignment errors at run time.