npm-EPERM：不允许操作，请在Windows上阅读

Question

I have problem when i try to run npm start

Error: EPERM: operation not permitted, read at Object.readSync (fs.js:498:3) at Object.readSync (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\graceful-fs\\polyfills.js:143:28) at tryReadSync (fs.js:332:20) at Object.readFileSync (fs.js:361:19) at Object. (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:220:39) at Generator.next () at asyncGeneratorStep (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:78:24) at _next (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:98:9) at C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:103:7 at new Promise () type: 'Error', errno: -4048, syscall: 'read', code: 'EPERM' } (node:14128) UnhandledPromiseRejectionWarning: Error: EPERM: operation not permitted, read at Object.readSync (fs.js:498:3) at Object.readSync (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\graceful-fs\\polyfills.js:143:28) at tryReadSync (fs.js:332:20) at Object.readFileSync (fs.js:361:19) at Object. (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:220:39) at Generator.next () at asyncGeneratorStep (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:78:24) at _next (C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:98:9) at C:\\Users\\Nidhal\\ReactProjects\\dieton\\node_modules\\jest-haste-map\\build\\worker.js:103:7 at new Promise () (node:14128) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:14128) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Answer 1

We recommend installing Node and Python2 via Chocolatey , a popular package manager for Windows.

1. Open an Administrator Command Prompt (right click Command Prompt and select "Run as Administrator"), then run the following command:

   choco install -y nodejs.install python2 jdk8

If you have already installed Node on your system, make sure it is Node 8.3 or newer. If you already have a JDK on your system, make sure it is version 8 or newer.

2. npm install -g react-native-cli
3. Install Android Studio
4. Configure the ANDROID_HOME environment variable
5. react-native init YourProject
6. cd YourProject
7. react-native run-android

Detailed description of the installation methods of installation

Answer 2

Here is the few possible solution, you may try. Otherwise explain the issue in details

To access and make a change to current directory you need to run cmd as administrator.

Try to run cmd as administrator

Then do npm start, that will works in a normal console.

Otherwise-

npm cache clean --force

npm cache verify

Otherwise - You may also try to downgrade or upgrade the npm version

To uninstall:

npm uninstall npm -g

Install the Latest version:

npm install -g npm@latest

or

Install the previous version:

npm install npm@5.3 -g

Answer 3

我建议您关闭用于打开代码文件的IDE（VSCode / WebStorm / etc），然后尝试npm install 。