I have a question about this NPM package

Hello, I’m kinda new here and I wanted to add discord.js commando package to a project I’m experimenting with, I know how to add the package itself, but in its NPM page it says "When running a bot using Commando, make sure to run Node with the --harmony flag. Examples:"
node --harmony somebot.js
pm2 start somebot.js --node-args '–harmony’
and I don’t know how to run that flag or do I even need to run that flag.
Here is the NPM Package: https://www.npmjs.com/package/discord.js-commando
Project: discord.js bot

I asked over the d.js official in the commando support channel and got a response that harmony flag is not necessary.

For info, here’s an example of a node command using Harmony flags: https://glitch.com/edit/#!/async-await-playground?path=package.json:1:0