Support Async Functions in eslint

[rafadorado]

Eslint parser does not support async functions, eslint/eslint#8366

Basically we need to add to the .eslintrc

"parserOptions": {
        "ecmaVersion": 2017
},

[iroy2000]

I try to use the same config

  "parserOptions": {
    "ecmaVersion": 2017,
    "ecmaFeatures": {
      // Enabled object spread
      "experimentalObjectRestSpread": true,
      "jsx": true
    }
  },

But the same error still coming out.

And what I end up is creating a class to wrap the asycn functions, which works fine

class API {
  static async getStuff(apiPayload) {
    const response = await apiAsyncGetStuff(apiPayload)

    // ... do something
  }
}

[yukhnevych]

You can fix it using the latest version of ESLint and set parser options like this:

{
  "parserOptions": {
      "ecmaVersion": 8
  }
}

[JMTK]

Still having some troubles with this one...

ESLint file is: (I am on 5.14.1)

module.exports = {
      "env": {
          "node": true,
          "es7": true
      },
      "parserOptions": {
          "ecmaVersion": 8
      },
      "rules": {
          "linebreak-style": [
              "error",
              "unix"
          ],
          "semi": [
              "error",
              "always"
          ]
      }
  };

I've verified changing the ecmaVersion DOES affect the parsing, if I set it to ES5 then I get a lot of issues with let and arrow syntax. I have no other .eslint files. I've tried ecmaVersion: 2018 as well as ecmaVersion: 2017.

This is an excerpt from a file that has no errors until we get to a line that has an async/await WITH an arrow function

botReply: (message, text, embed) => {
    return new Promise(async (resolve, reject) => {
	let prefs = null;
	if (!text) {
		  text = '';
	  }
	  let split = false;
	  if (text.length >= Config.MaxMessageLength) {
		  split = true;
	  }
	  if (!util.isPM(message)) {
		  prefs = util.ServerPrefs[message.guild.id];
	  }
	  else {
		  prefs = Config.Defaults.PMPrefs;
	  }
	  let translate = 'en';
	  if (prefs && prefs.Language && prefs.Language !== translate) {
		  translate = prefs.Language;
	  }
	  try {
		  if (typeof embed === 'object' && translate !== 'en') {
			embed.title = await util.translate('en', translate, embed.title);
			embed.description = await util.translate('en', translate, embed.description);
//function continues on

Compiles fine in NodeJS 10.x and I've been using it since Node 8.

EDIT: Quick correction, es7 was not a valid environment variable so I've changed it to es6. It did not fix any issues but it did fix a couple of my rules like "no-unused-vars" to start working correctly.

[JMTK]

For comparison, I tried just doing the command line but this seems to be a vim issue maybe?

Not sure where the disconnect is. I'm using w0rp/ale right now.

[jramcast]

Hi, I updated the package with support for es2018. Let me know if that solves your problem.