如何在Heroku上启用ES2017功能来运行Node.js应用程序? [英] How to run Node.js app with ES2017 features enabled on Heroku?
问题描述
我是Node新手,创建了一个应用程序,其中包含一些async / await语法,如下所示:
const express = require('express');
const app = express();
const someLibrary = require('someLibrary');
函数asyncWrap(fn){
return(req,res,next)=> {
fn(req,res,next).catch(next);
};
};
app.post('/ getBlock',asyncWrap(async(req,res,next)=> {
let block = await someLibrary.getBlock(req.body.id);
[多一些代码]
}));
app.listen(process.env.PORT || 8000);
在我的机器上工作正常,但是当我部署到Heroku时,出现错误,因为语法不是支持:
2017-03-23T10:11:13.953797 + 00:00 app [web.1]:app.post '/ getBlock',asyncWrap(async(req,res,next)=> {
2017-03-23T10:11:13.953799 + 00:00 app [web.1]:SyntaxError:Unexpected token(
让Heroku支持这种语法最简单的方法是什么?
指定要在package.json中使用的节点版本: https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
因此,对于异步/等待支持,您需要指定> = 7.6.0
{
pre>
engines:{
node:> = 7.6.0
}
}
I'm new to Node and created an app that has some async/await syntax in it like so:
const express = require('express'); const app = express(); const someLibrary = require('someLibrary'); function asyncWrap(fn) { return (req, res, next) => { fn(req, res, next).catch(next); }; }; app.post('/getBlock', asyncWrap(async (req,res,next) => { let block = await someLibrary.getBlock(req.body.id); [some more code] })); app.listen(process.env.PORT || 8000);
It works fine on my machine but when I deploy to Heroku I get an error because the syntax is not supported:
2017-03-23T10:11:13.953797+00:00 app[web.1]: app.post('/getBlock', asyncWrap(async (req,res,next) => { 2017-03-23T10:11:13.953799+00:00 app[web.1]: SyntaxError: Unexpected token (
What is the easiest way to get Heroku to support this syntax?
解决方案Specify the node version you want to use in your package.json: https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
So for async/await support you'll want to specify >= 7.6.0
{ "engines": { "node": ">= 7.6.0" } }
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