npm run build使用create-react-app失败

Question

我有一个node / express / react应用程序，我正在使用create-react-app为客户端构建。 每当我运行npm run build我都会收到此错误：

> frontend@0.1.0 build /Users/crescentfresh/myApp/client
> react-scripts build

module.js:487
    throw err;
    ^

Error: Cannot find module 'dotenv-expand'
    at Function.Module._resolveFilename (module.js:485:15)
    at Function.Module._load (module.js:437:25)
    at Module.require (module.js:513:17)
    at require (internal/module.js:11:18)
    at dotenvFiles.forEach.dotenvFile (/Users/crescentfresh/myApp/client/node_modules/react-scripts/config/env.js:43:5)
    at Array.forEach (native)
    at Object.<anonymous> (/Users/crescentfresh/myApp/client/node_modules/react-scripts/config/env.js:41:13)
    at Module._compile (module.js:569:30)
    at Object.Module._extensions..js (module.js:580:10)
    at Module.load (module.js:503:32)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! frontend@0.1.0 build: `react-scripts build`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the frontend@0.1.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/crescentfresh/.npm/_logs/2018-10-09T23_53_36_314Z-debug.log

这是我的create-react-app目录的package.json：

{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "proxy": {
    "/api/*": {
      "target": "http://localhost:3000"
    }
  },
  "dependencies": {
    "@uppy/core": "^0.27.3",
    "@uppy/dashboard": "^0.27.5",
    "@uppy/react": "^0.27.5",
    "@uppy/tus": "^0.27.5",
    "apollo-cache-inmemory": "^1.2.5",
    "apollo-client": "^2.3.5",
    "apollo-link": "^1.2.2",
    "apollo-link-error": "^1.1.0",
    "apollo-link-http": "^1.5.4",
    "apollo-link-state": "^0.4.1",
    "axios": "^0.18.0",
    "bootstrap": "^4.1.1",
    "graphql": "^0.13.2",
    "graphql-tag": "^2.9.2",
    "prop-types": "^15.6.2",
    "react": "^16.4.1",
    "react-apollo": "^2.1.9",
    "react-dom": "^16.4.1",
    "react-router": "^4.3.1",
    "react-router-dom": "^4.3.1",
    "react-scripts": "2.0.3",
    "react-spinners": "^0.4.5",
    "reactstrap": "^6.2.0",
    "recompose": "^0.29.0"
  },
  "scripts": {
    "start": "cross-env PORT=3003 react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "cross-env": "^5.2.0"
  }
}

这用于构建但最近开始失败。 我尝试删除在失败的构建发生之前添加的软件包，但这没有帮助（uppy和axios软件包）所以我不确定这是否甚至相关。

如果还有其他什么我应该包括请告诉我。

Answer 1

请运行此命令以解决该错误。

npm i dotenv-expand

Answer 2

有很多问题可能导致这个问题，即React，npm，包源。也许在终端运行这个npm i --save-dev dotenv-expand / yarn add --save-dev dotenv-expand