如何将__dirname配置为指向节点中的项目目录

Question

我正在向我的节点项目添加一个sequelize，它添加了以下index.js文件作为设置的一部分，但当我运行项目时，__dirname解析为我的C:目录，而不是项目根文件夹C： \workspace\myapp。如何配置它，使其解析为我的项目根目录？

index.js文件

'use strict';
const fs = require('fs');
const path = require('path');
const Sequelize = require('sequelize');
const basename = path.basename(__filename);
const env = process.env.NODE_ENV || 'development';
const config = require(__dirname + '/../config.json')[env];
const db = {};
let sequelize;
if (config.use_env_variable) {
sequelize = new Sequelize(process.env[config.use_env_variable], config);
} else {
sequelize = new Sequelize(config.database, config.username, config.password, config);
}
fs.readdirSync(__dirname)
.filter(file => {
return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
})
.forEach(file => {
const model = sequelize['import'](path.join(__dirname, file));
db[model.name] = model;
});
Object.keys(db).forEach(modelName => {
if (db[modelName].associate) {
db[modelName].associate(db);
}
});
db.sequelize = sequelize;
db.Sequelize = Sequelize;
module.exports = db;

软件包.json

{
"name": "my-app-model",
"version": "0.1.0",
"private": true,
"scripts": {
"dev": "next dev",
"build": "next build",
"format": "prettier --write "src/**/*.{js,jsx,ts,tsx}"",
"start": "next start",
"type-check": "tsc"
},
"dependencies": {
"@material-ui/core": "^4.8.3",
"@material-ui/lab": "4.0.0-alpha.39",
"mysql": "^2.18.1",
"mysql2": "^2.1.0",
"next": "9.1.7",
"prettier": "^1.19.1",
"react": "16.12.0",
"react-dom": "16.12.0",
"sequelize": "^5.21.7",
"sequelize-cli": "^5.5.1"
},
"devDependencies": {
"@types/node": "^13.1.6",
"@types/react": "^16.9.17",
"@types/react-dom": "^16.9.4",
"typescript": "^3.7.4"
}
}

Answer 1

我认为立即的解决方案是用类似的东西替换__dirname

const modelsDir = path.resolve(process.cwd(), 'path/to/models')
fs.readdirSync(modelsDir)
.filter(....

让__dirname按照我们期望的方式工作是next.js:上的一个已知问题

我希望__dirname是执行getStaticProps的文件的绝对路径，但它被错误地解析为/。

以下是重新表述为功能请求的问题：https://github.com/vercel/next.js/issues/8251

这对我来说是如何表现的，以防有人找到这个解决方案：

我用的是mac，但我也遇到了类似的问题。我正在用sequelize建立一个next.js应用程序。在我运行sequelize-cli生成上面引用的models/index.js之后，我第一次看到这个错误：

Error: Cannot find module '/Applications'
Require stack:
- /Users/username/src/mariner-next/node_modules/sequelize/lib/sequelize.js
- /Users/username/src/mariner-next/node_modules/sequelize/index.js
- /Users/username/src/mariner-next/.next/server/static/development/pages/api/graphql.js
- /Users/username/src/mariner-next/node_modules/next/dist/next-server/server/next-server.js
- /Users/username/src/mariner-next/node_modules/next/dist/server/next.js
- /Users/username/src/mariner-next/node_modules/next/dist/server/lib/start-server.js
- /Users/username/src/mariner-next/node_modules/next/dist/cli/next-dev.js
- /Users/username/src/mariner-next/node_modules/next/dist/bin/next
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:981:15)
at Function.Module._load (internal/modules/cjs/loader.js:863:27)
at Module.require (internal/modules/cjs/loader.js:1043:19)
at require (internal/modules/cjs/helpers.js:77:18)
at Sequelize.import (/Users/username/src/mariner-next/node_modules/sequelize/lib/sequelize.js:481:62)
at eval (webpack-internal:///./tnr/lib/models/index.js:60:36)
at Array.forEach (<anonymous>)
at Module.eval (webpack-internal:///./tnr/lib/models/index.js:58:4)

经过一番思考，我意识到__dirname被设置为"/"，因此fs.readdrSync(__dirname)正在返回我的根目录列表。

Answer 2

我已经成功地使用了rootrequire(归档以支持ES6模块(：https://github.com/ericelliott/rootrequire

const root = require('rootrequire'); // project root path
const myLib = require(`${root}/path/to/lib.js`);