更改 PATH 系统环境变量后 npm 开始不起作用

Question

当我尝试使用 npm start 启动我的 React 应用程序时，出现以下错误：

events.js:377
      throw er; // Unhandled 'error' event
      ^

Error: spawn powershell ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:274:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
Starting the development server...

events.js:377
      throw er; // Unhandled 'error' event
      ^

Error: spawn powershell ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:274:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:280:12)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21) {
  errno: -4058,
  code: 'ENOENT',
  syscall: 'spawn powershell',
  path: 'powershell',
  spawnargs: [
    '-NoProfile',
    '-NonInteractive',
    '–ExecutionPolicy',
    'Bypass',
    '-EncodedCommand',
    'UwB0AGEAcgB0ACAAIgBgACIAaAB0AHQAcAA6AC8ALwBsAG8AYwBhAGwAaABvAHMAdAA6ADgAMAA4ADYALwBwAG8AcgB0AGEAbABgACIAIgA='
  ]
}

命令在Visual Studio代码中执行。在命令 shell 中执行命令会产生几乎相同的错误：


> fe-core4@0.1.0 start
> set PORT=8086 && set HTTPS=false && react-scripts start

i ｢wds｣: Project is running at http://172.19.42.69/
i ｢wds｣: webpack output is served from /portal
i ｢wds｣: Content not from webpack is served from C:\Users\...
i ｢wds｣: 404s will fallback to /portal/
Starting the development server...

events.js:377
      throw er; // Unhandled 'error' event
      ^

Error: spawn powershell ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:274:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21)
Emitted 'error' event on ChildProcess instance at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:280:12)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:82:21) {
  errno: -4058,
  code: 'ENOENT',
  syscall: 'spawn powershell',
  path: 'powershell',
  spawnargs: [
    '-NoProfile',
    '-NonInteractive',
    '–ExecutionPolicy',
    'Bypass',
    '-EncodedCommand',
    'UwB0AGEAcgB0ACAAIgBgACIAaAB0AHQAcAA6AC8ALwBsAG8AYwBhAGwAaABvAHMAdAA6ADgAMAA4ADYALwBwAG8AcgB0AGEAbABgACIAIgA='
  ]
}

最近我在安装 maven 时遇到了问题，不小心删除了 PATH 系统环境变量。我以某种方式恢复了它，但也许有些东西仍然无法正常工作，这可能是错误的原因。

我的PATH系统环境变量：

%USERPROFILE%\AppData\Local\Microsoft\WindowsApps
%USERPROFILE%\AppData\Local\Programs\Microsoft VS Code\bin
%MAVEN_HOME%\bin
C:\Windows
C:\Windows\System32\Wbem
C:\Program Files\nodejs\
C:\Program Files\Git\bin\
C:\Program Files\Git\cmd\
C:\Windows\System32

更新

npm start 运行以下代码： set PORT=8086 && set HTTPS=false && react-scripts start

NPM 和 node.js 似乎工作正常：

> node -v

v16.13.2

> npm -v

8.4.0

Answer 1

我找到了解决问题的方法。

起初我从朋友那里复制了PATH系统环境变量的值：

%USERPROFILE%\AppData\Local\Microsoft\WindowsApps
%USERPROFILE%\AppData\Local\Programs\Microsoft VS Code\bin
%MAVEN_HOME%\bin
C:\Program Files\Git\bin\
C:\Program Files\Git\cmd\
%SystemRoot%\system32
%SystemRoot%
%SystemRoot%\System32\Wbem
%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\
%SYSTEMROOT%\System32\OpenSSH
C:\Program Files\nodejs\

之后，我尝试执行的每个 npm 命令都出现以下错误

npm ERR! Unexpected token '.'

所以我按照 this guide 完全删除节点，然后重新安装节点 lts 版本 14.19.0。之后一切正常。

更改 PATH 系统环境变量后 npm 开始不起作用

npm start not working after changing PATH system environment variable

reactjs

npm

environment-variables

system-variable