React和Express的Heroku错误：找不到app.js

Question

我构建了很少的应用程序，并决定在Heroku上托管一个应用程序。我已配置Express服务器以在Build文件夹中运行文件：server / server.js：

const path = require('path');
const express = require('express');
const app = express();
const publicPath = path.join(__dirname, '..', 'build');
const port = process.env.PORT || 3000;
app.use(express.static(publicPath));
app.get('*', (req, res) => {
    res.sendFile(path.join(publicPath, 'index.html'));
});
app.listen(port, () => {
    console.log('Server is up!');
});

[当我尝试在本地运行服务器时，一切正常。我已经将整个项目托管在GitHub上（通过文件上传，因为我需要的端口被阻止了），并将Heroku设置为从那里获取项目。我已将Procfile设置为此：

web: node server/server.js

我希望Heroku运行服务器，并且服务器将从项目的build文件夹中获取文件。但是Heroku CLI显示以下错误：

2019-11-01T20:14:22.015987+00:00 heroku[web.1]: Starting process with command `node app.js`
2019-11-01T20:14:23.648922+00:00 heroku[web.1]: Process exited with status 1
2019-11-01T20:14:23.687276+00:00 heroku[web.1]: State changed from starting to crashed
2019-11-01T20:14:23.691982+00:00 heroku[web.1]: State changed from crashed to starting
2019-11-01T20:14:23.607228+00:00 app[web.1]: internal/modules/cjs/loader.js:638
2019-11-01T20:14:23.607245+00:00 app[web.1]: throw err;
2019-11-01T20:14:23.607246+00:00 app[web.1]: ^
2019-11-01T20:14:23.607247+00:00 app[web.1]:
2019-11-01T20:14:23.607248+00:00 app[web.1]: Error: Cannot find module '/app/app.js'
2019-11-01T20:14:23.607253+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
2019-11-01T20:14:23.607254+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:562:25)
2019-11-01T20:14:23.607255+00:00 app[web.1]: at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
2019-11-01T20:14:23.607259+00:00 app[web.1]: at startup (internal/bootstrap/node.js:283:19)
2019-11-01T20:14:23.60726+00:00 app[web.1]: at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

package.json：

 "name": "ai",
  "version": "0.9.0",
  "private": true,
  "engines": {
    "npm": "^6.9.0",
    "node": "^v10.15.3"
  },
  "dependencies": {
    "bootstrap": "^4.3.1",
    "emailjs-com": "^2.4.0",
    "express": "^4.17.1",
    "i18next": "^17.0.11",
    "i18next-browser-languagedetector": "^3.0.3",
    "react": "^16.9.0",
    "react-bootstrap": "^1.0.0-beta.11",
    "react-dom": "^16.9.0",
    "react-i18next": "^10.12.2",
    "react-image-gallery": "^0.9.1",
    "react-scripts": "3.1.1"
  },
  "scripts": {
    "start": "node server/server.js",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

构建正常，但是找不到app.js。错误日志中的路径给我的意义不多-难道它不应该在build文件夹中寻找其他（最小化）文件吗？最重要的是，我的项目中没有app /文件夹。我想念什么？

Answer 1

默认情况下，您的项目可能正在寻找app.js文件。如果server.js是您的主要项目文件，则可能需要查找指定了app / app.js的位置，并将其更改为server / server.js