NextJS+Heroku:未加载环境变量

Question

这是我的next.config.js文件：

const { parsed: localEnv } = require('dotenv').config()
const webpack = require('webpack')
const Dotenv = require('dotenv-webpack')
const path = require('path')

module.exports = {
    //target: 'serverless',
    webpack(config) {
        config.plugins.push(new webpack.EnvironmentPlugin(localEnv))
        config.node = {fs: "empty"};
        config.plugins = config.plugins || []

        config.plugins = [
            ...config.plugins,

            // Read the .env file
            new Dotenv({
                path: path.join(__dirname, '.env'),
                systemvars: true
            })
        ]

        return config
    },
    publicRuntimeConfig: {
        ADDRESS: process.env.ADDRESS,
        API_TOKEN: process.env.API_TOKEN,
        INFURA_API_KEY: process.env.INFURA_API_KEY
    }
}

Answer 1

在next.js github页面上得到了答案：https://github.com/zeit/next.js/issues/6533

我试过几种不同的方法来解决这件事。

使用dotenv-webpack设置环境变量对我不起作用。起作用的是在next.config.js中设置env，如下所示：

const { parsed: localEnv } = require('dotenv').config()
const webpack = require('webpack');

const path = require('path')

module.exports = {
    webpack(config) {
        config.plugins.push(new webpack.EnvironmentPlugin(localEnv))
        config.node = {fs: "empty"};
        config.plugins = config.plugins || []

        config.plugins = [
            ...config.plugins,
        ]

        return config
    },
    env: {
        ADDRESS: '0xd6F75293ec795',
        API_TOKEN: 'YUBKzlbA2eFmNbkzk',
        INFURA_API_KEY: '97eb10aac61799f9e865',
        MNEMONIC: 'my not so secret for testing password',
    }
}