SyntaxError Unexpected token function - Async Await Nodejs

Question

I was experimenting on using Node version 6 2 1 with some of my code  Had plans to migrate most of the hyper-callback oriented codes to something that looks cleaner and maybe performs better   I have no clue why  the terminal throws up an error when I try to execute the node code   helloz js   async function testingAsyncAwait         await console log  Print me             Logs-  BOZZMOB-M-T0HZ rest bozzmob  node helloz js   Users bozzmob Documents work nextgennms rest helloz js 1  function  exports  require  module    filename    dirname     async function testingAsyncAwait                                                                                   SyntaxError  Unexpected token function     at Object exports runInThisContext  vm js 53 16      at Module  compile  module js 513 28      at Object Module  extensions  js  module js 550 10      at Module load  module js 458 32      at tryModuleLoad  module js 417 12      at Function Module  load  module js 409 3      at Function Module runMain  module js 575 10      at startup  node js 160 18      at node js 456 3 BOZZMOB-M-T0HZ rest bozzmob  node -v v6 2 1   What am I missing  Please throw me some light on the same     Update 1   I tried to use Babel as Quentin suggested  But  I am getting the following error still   Updated Code-  require  babel-core register    require  babel-polyfill          async function testingAsyncAwait             await console log  Print me                 Logs-  BOZZMOB-M-T0HZ rest bozzmob  babel helloz js  gt  helloz trans js SyntaxError  helloz js  Unexpected token  3 7    1   require  babel-polyfill      2     gt  3    async function testingAsyncAwait                      4       await console log  Print me       5

User · Answer

include and specify the node engine version to the latest, say at this time I did add version 8.

{
  "name": "functions",
  "dependencies": {
    "firebase-admin": "~7.3.0",
    "firebase-functions": "^2.2.1",
  },
  "engines": {
    "node": "8"
  },
  "private": true
}

in the following file

package.json

User · Answer

Node JS does not fully support ES6 currently  so you can either use asyncawait module or transpile it using Bable    install   npm install --save asyncawait   helloz js  var async   require  asyncawait async    var await   require  asyncawait await      async  function testingAsyncAwait         await  console log  Print me

User · Answer

Nodejs supports async await from version 7 6   Release post  https   v8project blogspot com br 2016 10 v8-release-55 html

User · Answer

If you are just experimenting you can use babel-node command line tool to try out the new JavaScript features   Install babel-cli into your project    npm install --save-dev babel-cli  Install the presets    npm install --save-dev babel-preset-es2015 babel-preset-es2017 Setup your babel presets  Create  babelrc in the project root folder with the following contents      presets     es2015   es2017     Run your script with babel-node      babel-node helloz js   This is only for development and testing but that seems to be what you are doing  In the end you ll want to set up webpack  or something similar  to transpile all your code for production   babel-node sample code   https   github com stujo javascript-async-await tree 15abac   If you want to run the code somewhere else  webpack can help and here is the simplest configuration I could work out    Full webpack example   https   github com stujo javascript-async-await

User · Answer

Async functions are not supported by Node versions older than version 7 6   You ll need to transpile your code  e g  using Babel  to a version of JS that Node understands if you are using an older version   That said  the current  2018  LTS version of Node js is 8 x  so if you are using an earlier version you should very strongly consider upgrading

User · Answer

node v6 6 0  If you just use in development  You can do this    npm i babel-cli babel-plugin-transform-async-to-generator babel-polyfill --save-dev   the package json would be like this     devDependencies         babel-cli     6 18 0       babel-plugin-transform-async-to-generator     6 16 0       babel-polyfill     6 20 0      create  babelrc file and write this         plugins     transform-async-to-generator       and then  run your async await script like this     node modules  bin babel-node script js

User · Answer

Though I m coming in late  what worked for me was to install transform-async-generator and transform-runtime plugin like so   npm i babel-plugin-transform-async-to-generator babel-plugin-transform-runtime --save-dev  the package json would be like this     devDependencies         babel-plugin-transform-async-to-generator    6 24 1       babel-plugin-transform-runtime    6 23 0      create  babelrc file and write this         plugins     transform-async-to-generator      transform-runtime            polyfill   false         regenerator   true              and then happy coding with async await

User · Answer

I too had the same problem  I was running node v 6 2 alongside using purgecss within my gulpfile  Problem only occurred when I created a new Laravel project  up until that point  I never had an issue with purgecss  Following  Quentin s statement - how node versions prior to 7 6 do not support async functions - I decided to update my node version to 9 11 2 This worked for me  1-   npm install -g n    n 9 11 2  2- delete  node modules  from the route directory 3-   npm install  Still not sure how node purgecss worked prior to updating   but this did the trick

[javascript] SyntaxError: Unexpected token function - Async Await Nodejs

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