E0307: unexpected '?'

In JavaScript, ? is used for the conditional operator (e.g. haveEggs ? takeEgg() : null). In TypeScript, ? is also used for optional properties and parameters. It is a syntax error to write ? in other contexts:

class EggBasket {
  maybeTakeEgg() {
    return this.haveEggs ?
  }
  get haveEggs() { /* ... */ }
  removeEgg() { /* ... */ }
}

To fix this error, complete the conditional expression:

class EggBasket {
  maybeTakeEgg() {
    return this.haveEggs
         ? this.removeEgg()
         : null;
  }
  /* ... */
}

Introduced in quick-lint-js version 2.10.0.

Documentation for other errors