Why is optional chaining not working in my Node REPL?

Question

I literally copy pasted example code from MDN but optional chaining wont work in my node(v12.13.0) REPL. Throws out a syntax error saying that the dot after the question mark is invalid. What's going on ? I have already used this expression in a React App and it seems to be working fine.

const adventurer = {
  name: 'Alice',
  cat: {
    name: 'Dinah'
  }
};


const dogName = adventurer.dog?.name;
console.log(dogName);
// expected output: undefined

console.log(adventurer.someNonExistentMethod?.());
// expected output: undefined

metal bar · Accepted Answer · 2020-10-03T20:51:12.563

6

It's only coming for Node 14 under --harmony: How to use optional chaining in Node.js 12

You can use babel optional chaining plugin if you want this feature in node: https://babeljs.io/docs/en/next/babel-plugin-syntax-optional-chaining.html

edited Oct 03 '20 at 20:51

answered Sep 19 '20 at 05:09

metal bar

522
3
12

1

Thanks I was wondering why the expression was working in my react-native app but not my node REPL. Must be a babel plugin which comes by default. – Harsha Limaye Sep 19 '20 at 05:12
Yes the default preset which babel uses in react-native apps created using the cli tool enables optional chaining. – Harsha Limaye Sep 19 '20 at 05:22
I'm still getting a syntax error even with that package installed. – claudekennilol Oct 24 '21 at 21:43

Why is optional chaining not working in my Node REPL?

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