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With the latest version of nodejs 7.6+ I started using async/await.
I was using jshint but from what I read they currently do support this syntax and some suggested using eslint.
So ok I set eslint up but argh.. it flags async functions too.Parsing error: Unexpected token init (Fatal)
I know there is nothing wrong as my code is running fine it's just the linter. Too if I comment out an async function it just flags the next one. IN fact eslint only flags the first async found with this error not all of them (what up with that?)
Here is the eslintrc file made using the init wizard. I was hoping just asking for node and es6 for env would be sufficient...apparently not.
module.exports = {
"env": {
"es6": true,
"node": true
},
"extends": "eslint:recommended",
"rules": {
"indent": [
"error",
"tab"
],
"linebreak-style": [
"error",
"unix"
],
"quotes": [
"error",
"single"
],
"semi": [
"error",
"never"
]
}
};
What is the fix?
I've tried several versions of .eslintrc and even saw there are a few issues related at the eslint repo but none are helping me to resolve this. I don't think it's a bug just missing something about getting eslint set up correctly for native nodejs using commonjs (no babel).
Who knows maybe babel plugin is required to make this work even though I am not using babel??? If that's true how do I set that up.
460
With Node v8, the async/await feature was officially rolled out by the Node to deal with Promises and function chaining. The functions need not to be chained one after another, simply await the function that returns the Promise. But the function async needs to be declared before awaiting a function returning a Promise.
function asyncThing (value) { return new Promise((resolve) => { setTimeout(() => resolve(value), 100); }); } async function main () { return [1,2,3,4]. reduce(async (acc, value) => { return await acc + await asyncThing(value); }, Promise. resolve(0)); } main() . then(v => console.
async and await Inside an async function, you can use the await keyword before a call to a function that returns a promise. This makes the code wait at that point until the promise is settled, at which point the fulfilled value of the promise is treated as a return value, or the rejected value is thrown.
An async function is a function declared with the async keyword, and the await keyword is permitted within it. The async and await keywords enable asynchronous, promise-based behavior to be written in a cleaner style, avoiding the need to explicitly configure promise chains.
Since async/await is an ES2017 feature, you need to add that to your .eslintrc.js:
module.exports = {
// ...
"parserOptions": {
"ecmaVersion": 2017
},
// ...
}
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