SyntaxError: missing ) after argument list, When using async
Why am I getting this error When I use async?
My Code:
bot.onText(/\/start/, async msg => {
const opts = {
parse_mode: 'Markdown' ,
reply_markup: JSON.stringify({
keyboard: StartKeyboard,
resize_keyboard: true,
one_time_keyboard: true
})
};
await bot.sendMessage(msg.chat.id, 'Hi', opts);
});
Error:
bot.onText(/\/start/, async msg => {
^^^^^
SyntaxError: missing ) after argument list
I’m using node.js v6.11.0 with “dependencies”:
{ "babel-polyfill": "^6.23.0",
"cheerio": "^1.0.0-rc.2",
"dotenv": "^4.0.0",
"firebase": "^4.1.2",
"firebase-admin": "^5.0.0",
"node-telegram-bot-api": "^0.27.1",
"request": "^2.81.0" },
Your version of NodeJS (6.11 LTS) is too old and does not support the async/await features. The syntax error is a result of the Javascript interpreter not recognizing the async token and getting confused about arguments.
Upgrade to NodeJS 7.6 or later. https://www.infoq.com/news/2017/02/node-76-async-await
In prior versions, the only way to perform asynchronous behaviour is to use promises.
If you don’t want to/can’t update your node version, try using babel presets.
I had the same error using ES6 with jest (node v6.9.1).
Just add these two modules to your dependencies
npm install --save babel-preset-es2015 babel-preset-stage-0
And add a file .babelrc to your root dir with the following code:
{ "presets": ["es2015", "stage-0"] }
And if you are not using it already, install babel-cli and run your application with babel-node command
sudo npm install -g babel-cli
babel-node app.js
If you’re seeing this error with a newer version of Node, it’s probably a syntax or some other error before the line Node is pointing out.
For instance, consider the snippet below.
router.get("/", function (req, res, next) {
try {
res.json(await mySvc.myFunc());
} catch (err) {
console.error(err.message);
next(err);
}
});
With node -v reporting v14.17.6, this gives:
myapp $ DEBUG=myapp:* npm start
> [email protected] start /home/me/myapp
> node ./bin/www
/home/me/myapp/routes/myroute.js:7
res.json(await mySvc.myFunc());
^^^^^
SyntaxError: missing ) after argument list
The error, of course, is on the first line of the snippet. Adding an async on that line, thus,
router.get("/", async function (req, res, next) {
fixes the issue.
