"ecmaVersion": "2017" gives Parsing error: Unexpected token ( on async method

• ESLint Version: v4.10.0
• Node Version: v8.10.0
• npm Version: 6.0.1

What parser (default, Babel-ESLint, etc.) are you using? default

Please show your full configuration:

Configuration

{
  "extends": "eslint:recommended",
  "env": {
    "node": true,
    "es6": true,
    "jest": true
  },
  "parserOptions": {
    "ecmaVersion": "2017"
  },
  "plugins": [
    "node"
  ],
  "rules": {
    "arrow-parens": ["error", "always"],
    "no-var": "error",
    "prefer-const": "error",
    "array-bracket-spacing": ["error", "never"],
    "comma-dangle": ["error", "never"],
    "computed-property-spacing": ["error", "never"],
    "eol-last": "error",
    "eqeqeq": ["error", "smart"],
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "no-confusing-arrow": ["error", {"allowParens": false}],
    "no-extend-native": "error",
    "no-mixed-spaces-and-tabs": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "no-unused-vars": "error",
    "no-use-before-define": ["error", "nofunc"],
    "object-curly-spacing": ["error", "always"],
    "prefer-arrow-callback": "error",
    "quotes": ["error", "single", "avoid-escape"],
    "semi": ["error", "always"],
    "space-infix-ops": "error",
    "spaced-comment": ["error", "always"],
    "keyword-spacing": ["error", { before: true, after: true }],
    "template-curly-spacing": ["error", "never"],
    "semi-spacing": "error",
    "strict": "error",
    "no-console": "off",
    "node/no-unsupported-features": ["error", {"version": 8}],
    "node/no-missing-require": "error"
  }
}

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

class DeadLetter {
  constructor(options = {}) {
    if (!options.queueUrl)
      throw new Error('queueUrl is undefined');
    this.options = options;
    this.sqs = new AWS.SQS({
      region: url.parse(options.queueUrl).host.split('.')[1],
      params: { QueueUrl: options.queueUrl }
    });

    this.cfn = new AWS.CloudFormation({
      region: url.parse(options.queueUrl).host.split('.')[1],
    });

    const actions = { purse, writeOut, replay, triage };

    findQueues(this.cfn, options);
    const queues = selectQueue(queues);
    const queue = triageSelection(queue);
    const data = actions[data.action](sqs, data.queue);
  }

  async findQueues(options) {
    return new Promise((resolve) => {
      let res = await this.cfn.describeStacks({ StackName: options.stackName}).promise();

npm run lint

this basically runs eslint.

What did you expect to happen? I don’t think the ( on async should error. When I change the "ecmaVersion": "8", I get Parsing error: The keyword 'class' is reserved on the first line which also shouldn’t be the case.

What actually happened? Please include the actual, raw output from ESLint.

"ecmaVersion": "2017"

33:1 error Parsing error: Unexpected token (

"ecmaVersion": "8"

  11:1  error  Parsing error: The keyword 'class' is reserved

I checked on gitter channel members on this, seems like saying "ecmaVersion": "8" should work here, haven’t looked a lot on this, is there something in local setup or what else am I missing here?

[ljharb]

@Aladdin-ADD async/await was added in ES2017.

[platinumazure]

Did this solve your issue after all?

Agreed that we should catch this.