How to use optional chanining in Node v14?

Glitch Help
,
1

I use node v14 and it has optional chaining but glitch doesn’t let me turn it on so please add it asap

2

Can you post a code example of it?

3

Here’s the screenshot of the code and the error

code
error

4

Ah, now I see what you mean! That is actually something typescript adopted from Rust, you’ll have to use TypeScript to be able to do that! (Except for Node v14 and higher)

5

How do I make it not error in node v14?

6

Wait you’re on Node14 and it still errors?

7

Yea it does error even when I’m in node v14

8

Are you running this on Glitch? On Node v14 you need to add the --harmony flag in order for it to be included into the runtime.

9

I’ve changed the title and put your post under Glitch Help category because:

  1. This was not a Glitch issue.
  2. This is already possibly with Node v14
10

I see, how do I use that --harmony flag?

11

In your package.json file you can append --harmony to the start script.

For instance:

{
  "name": "hello-express",
  "version": "0.0.1",
  "description": "A simple Node app built on Express, instantly up and running.",
  "main": "server.js",
  "scripts": {
    "start": "node server.js --harmony"
  },
  "dependencies": {
    "express": "^4.17.1"
  },
  "engines": {
    "node": "14.x"
  },
  "repository": {
    "url": "https://glitch.com/edit/#!/hello-express"
  }
}
1 Like
12

I get the same error still http://prntscr.com/svgyi2

13

image

Strange, I got it to work… Only thing that makes sense is that you aren’t using node v14

14

Well yea, I forgot that I put it back to v12 after it didn’t work to make the project online. Now I tried 14.x but it uses 10.x saying it can’t find v14

15

You can install nvm and run nvm install node.

16

But how do I even stop glitch from using v10. It’s using that only and not the nvm’s node version

17

You can try putting this in your start script: /app/.nvm/versions/node/v14.4.0/bin/node amazing.js --harmony

18

Still uses node v10 only

19

It’s because of that

"engines": {
    "node": "14.x"
  },
20

Doesn’t make sense considering that Glitch doesn’t officially support 14.x?