'Parsing error: Unexpected token function' using async/await + ecmaVersion 2017

Tell us about your environment

• ESLint Version: 3.18.0
• Node Version: 7.7.3
• npm Version: 4.1.2

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

Please show your full configuration:

  root: true,
  parserOptions: {
    ecmaVersion: 2017,
    sourceType: 'module'
  },
  extends: ['eslint:recommended', 'airbnb-base'],
  env: {
    'node': true
  },
  rules: {
    'import/no-unresolved': 'off',
    'import/no-extraneous-dependencies': 'off',
    'func-names': 'off',
    'no-multi-spaces': 'off',
    'spaced-comment': ["error", "always", { "markers": ["/"] }],
    'comma-dangle': ['error', 'always-multiline'],
    'padded-blocks': 'off',
    'linebreak-style': 'off',
    'class-methods-use-this': 'off',
    'indent': ['error', 2],
    'max-len': ['error', 120, 2, { ignoreComments: true }],
    'no-unused-vars': ['error', { vars: 'local', args: 'after-used' }],
    'no-multiple-empty-lines': ['error', { max: 2, maxEOF: 1 }],
    'no-nested-ternary': 'off',
    'no-underscore-dangle': ['error', {'allow': ['_super', '_lookupFactory']}],
    'object-shorthand': ['error', 'methods'],
  }

What did you do? Please include the actual source code causing the issue.

describe('Some Mocha Test', () => {
  let target, context, exampleGame;
  ...
  const checkAttributes = function (callback) {
    return async function () { // Error here
      return callback(await target.getAttributesAsync(exampleGame, context));
    };
  };
}

What did you expect to happen? eslint passes

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

error  Parsing error: Unexpected token function

A similar issue happens with =>, as noted here

[not-an-aardvark]

To enable parsing for async functions, you should include this in your config:

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

[yochaiak]

Many Many Many Thanks 👍 👍 👍 👍