reactjs - 如何将reactJS应用程序部署到Heroku

Question

我正在尝试将reactJS应用程序部署到heroku。我正在本地机器上进行开发。我的 package.json 文件中有以下内容:

"name": "sample-app",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
  "start": "webpack-dev-server --open"
}

在本地计算机上进行测试时，我从命令提示符中输入“npm start”，浏览器将打开到 localhost:8080，并且我的应用程序将启动。

当我将应用程序部署到 heroku 服务并尝试启动该应用程序时，出现应用程序错误。然后我查看了日志，看到了以下内容:

2018-09-06T13:37:57.697321+00:00 app[api]: Release v1 created by user jonathn6@icloud.com
2018-09-06T13:37:57.785389+00:00 app[api]: Enable Logplex by user jonathn6@icloud.com
2018-09-06T13:37:57.785389+00:00 app[api]: Release v2 created by user jonathn6@icloud.com
2018-09-06T13:38:40.000000+00:00 app[api]: Build started by user jonathn6@icloud.com
2018-09-06T13:37:57.697321+00:00 app[api]: Initial release by user jonathn6@icloud.com
2018-09-06T13:39:05.206635+00:00 app[api]: Scaled to web@1:Free by user jonathn6@icloud.com
2018-09-06T13:39:05.188008+00:00 app[api]: Release v3 created by user jonathn6@icloud.com
2018-09-06T13:39:05.188008+00:00 app[api]: Deploy 257b0e8b by user jonathn6@icloud.com
2018-09-06T13:39:08.000000+00:00 app[api]: Build succeeded
2018-09-06T13:39:10.243037+00:00 heroku[web.1]: Starting process with command `npm start`
2018-09-06T13:39:12.459230+00:00 app[web.1]:
2018-09-06T13:39:12.459251+00:00 app[web.1]: > sample-app@1.0.0 start /app
2018-09-06T13:39:12.459255+00:00 app[web.1]:
2018-09-06T13:39:12.459253+00:00 app[web.1]: > webpack-dev-server --open
2018-09-06T13:39:13.990393+00:00 app[web.1]: Project is running at http://localhost:8080/
2018-09-06T13:39:13.990876+00:00 app[web.1]: webpack output is served from /
2018-09-06T13:39:13.990913+00:00 app[web.1]: Content not from webpack is served from /app/public
2018-09-06T13:39:13.990975+00:00 app[web.1]: 404s will fallback to /index.html
2018-09-06T13:39:13.999552+00:00 app[web.1]: internal/child_process.js:323
2018-09-06T13:39:13.999556+00:00 app[web.1]: throw errnoException(err, 'spawn');
2018-09-06T13:39:13.999557+00:00 app[web.1]: ^
2018-09-06T13:39:13.999559+00:00 app[web.1]:
2018-09-06T13:39:13.999560+00:00 app[web.1]: Error: spawn EACCES
2018-09-06T13:39:13.999562+00:00 app[web.1]: at _errnoException (util.js:992:11)
2018-09-06T13:39:13.999564+00:00 app[web.1]: at ChildProcess.spawn (internal/child_process.js:323:11)
2018-09-06T13:39:13.999565+00:00 app[web.1]: at Object.exports.spawn (child_process.js:502:9)
2018-09-06T13:39:13.999567+00:00 app[web.1]: at module.exports (/app/node_modules/opn/index.js:76:26)
2018-09-06T13:39:13.999569+00:00 app[web.1]: at reportReadiness (/app/node_modules/webpack-dev-server/bin/webpack-dev-server.js:474:5)
2018-09-06T13:39:13.999571+00:00 app[web.1]: at Server.server.listen (/app/node_modules/webpack-dev-server/bin/webpack-dev-server.js:439:7)
2018-09-06T13:39:13.999572+00:00 app[web.1]: at Server.returnValue.listeningApp.listen (/app/node_modules/webpack-dev-server/lib/Server.js:615:10)
2018-09-06T13:39:13.999575+00:00 app[web.1]: at emitNone (events.js:106:13)
2018-09-06T13:39:13.999573+00:00 app[web.1]: at Object.onceWrapper (events.js:313:30)
2018-09-06T13:39:13.999576+00:00 app[web.1]: at Server.emit (events.js:208:7)
2018-09-06T13:39:14.008212+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2018-09-06T13:39:14.008589+00:00 app[web.1]: npm ERR! errno 1
2018-09-06T13:39:14.009730+00:00 app[web.1]: npm ERR! sample-app@1.0.0 start: `webpack-dev-server --open`
2018-09-06T13:39:14.009893+00:00 app[web.1]: npm ERR! Exit status 1
2018-09-06T13:39:14.010124+00:00 app[web.1]: npm ERR!
2018-09-06T13:39:14.010297+00:00 app[web.1]: npm ERR! Failed at the sample-app@1.0.0 start script.
2018-09-06T13:39:14.010464+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2018-09-06T13:39:14.050770+00:00 app[web.1]:
2018-09-06T13:39:14.051004+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2018-09-06T13:39:14.051156+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2018-09-06T13_39_14_011Z-debug.log
2018-09-06T13:39:14.139768+00:00 heroku[web.1]: State changed from starting to crashed

我很确定我需要将“开始”脚本更改为其他脚本，但我不知道需要将其更改为什么。我想。

有什么想法吗？

Answer 1

您确实不应该使用开发服务器来尝试在生产中运行您的应用程序。我会推出一个简单的 Express 服务器并使用它来部署您的应用程序。您可以非常快速地完成此设置:

npm i -s express

然后在应用结构的顶层创建 server.js 文件。

将此代码放入 server.js 文件中:

const express = require('express')
const app = express()
const path = require('path')
const port = process.env.PORT || 3001

app.use('/', express.static(path.join(__dirname, 'public')))

app.listen(port, () => console.log("Listening on Port", port)) 

本质上，这只是设置您的服务器，然后向其显示在哪里可以找到您用来加载 React 应用程序的 index.html 页面，以便将其发送到浏览器。如果您的 webpack 设置将 index.html 文件输出到“public”以外的文件夹，只需将该文件夹的名称放在“__dirname”后面我放置“public”的位置即可。

现在您只需要构建您的应用程序。

如果您使用 webpack，那么就像在 package.json 中设置“构建”脚本一样简单:

"build": "webpack -p"

然后确保 Heroku 知道如何将您的构建与另一个脚本一起使用:

"heroku-postbuild": "npm run build"

最后设置“启动”脚本来运行服务器(Heroku 默认使用名称 start):

"start": node server.js

所以你的 package.json 脚本应该如下所示:

"scripts": {
    "dev-server": "webpack-dev-server --open"
    "start": "node server.js",
    "build": "webpack -p",
    "heroku-postbuild": "npm run build"
}

现在，如果您推送到 Heroku，它应该可以正常运行。