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[英]Cannot set environment variables for react app inside node.js app. (heroku)
[英]Heroku environment variables are not visible for the react app
我有一個主要基於 React 的前端應用程序,並且我創建了一個節點服務器來為該應用程序提供服務。 構建並且一切都成功,並且 index.html 也被提供,但它不會讀取我通過 heroku 應用程序設置(甚至來自 CLI)設置的環境變量。
Package.json 腳本
"scripts": {
"start": "node server",
"start-dev": "react-scripts start",
"start-windows": "set PORT=3001 && react-scripts start",
"build": "react-scripts build",
"postinstall": "npm run build",
"test": "jest src/**/*.test.js",
"eject": "react-scripts eject"
}
節點服務器,
const express = require ('express')
const app = express();
const http = require('http').Server(app);
const path = require( 'path')
let port = process.env.PORT || 3000;
app.use(express.static(path.join(__dirname, 'build')));
app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, 'build') + '/index.html');
});
app.listen(port, () => {
console.log(`App running on port ${port}`);
});
我在 js 中打印以下內容,
console.log('LOCAL_TEST_ENVIRONMENT --- ', process.env.LOCAL_TEST_ENVIRONMENT) // LOCAL_TEST_ENVIRONMENT --- undefined
console.log('BACKEND_URL --- ', process.env.BACKEND_URL) // BACKEND_URL --- undefined
console.log('NODE_ENV --- ', process.env.NODE_ENV) // NODE_ENV --- production
我怎樣才能解決這個問題?
訪問環境變量時,前綴REACT_APP_
是必需的,請嘗試
{process.env.REACT_APP_LOCAL_TEST_ENVIRONMENT}
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