在Windows 10上无法识别NodeJS安装的模块

Question

I need some help to setup NodeJS on a Windows 10 machine.

I installed the 10.15.3 LTS version from the official website which has done the following:

• Node installed at C:\\Program Files\\nodejs\\

• Added to the Path in the user's variables: C:\\Users\\rsantos\\AppData\\Roaming\\npm

• Added to the Path in the environment variables: C:\\Program Files\\nodejs\\

• Created an empty npm folder at: C:\\Users\\rsantos\\AppData\\Roaming

Then with npm init I initialized the package file which was created at C:\\Users\\rsantos .

Followed by npm install supervisor which:

• Created a npm-cache folder at C:\\Users\\rsantos\\AppData\\Roaming\\npm-cache

• Created a node_modules folder (with the supervisor) at C:\\Users\\rsantos\\node_modules

• Created a package-lock.json file at C:\\Users\\rsantos with:

  {
    "name": "rsantos",
    "version": "1.0.0",
    "lockfileVersion": 1,
    "requires": true,
    "dependencies": {
      "supervisor": {
        "version": "0.12.0",
        "resolved": "https://registry.npmjs.org/supervisor/-/supervisor-0.12.0.tgz",
        "integrity": "sha1-3n5jNwFbKRhRwQ81OMSn8EkX7ME="
      }
    }
  }

• Updated the package.json file to:

  {
    "name": "rsantos",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
      "test": "echo \"Error: no test specified\" && exit 1"
    },
    "author": "",
    "license": "ISC",
    "dependencies": {
      "supervisor": "^0.12.0"
    }
  }

Then when I open the command line and type:

C:\\Users\\rsantos\\Desktop>supervisor --watch C:\\NodeJS_Projects\\Proj1\\ -e js C:\\NodeJS_Projects\\Proj1\\Test.js

I get:

'supervisor' is not recognized as an internal or external command, operable program or batch file.

After that I tried to install supervisor globally and it started to work. The next error was 'require' not being recognized after installed locally. I followed the same approach which made supervisor work and installed require globally. My code is requiring the module with require('request') . But even installed globally, it fails with this error:

Error: Cannot find module 'request' at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)

Notes:

• I uninstalled everything and reinstalled, the result was always the same.

• Also played with the environment variables but still no good.

• npm list -g request outputs this: C:\\Users\\rsantos\\AppData\\Roaming\\npm -- request@2.88.0

• At this point my C:\\Users\\rsantos\\node_modules folder has all the modules, including supervisor and request.

• The package.json has supervisor and request as dependencies.

• The package-lock.json seems to have all the modules in the node_modules folder, including supervisor and request.

• I still get the Cannot find module 'request' error.

Can someone help please?

Answer 1

when you want to use a NPM package as tool (eg >supervisor --watch PATH ), you can install the package --global . When you want to load the package in Node with require() I would install it locally.

Does the following work for you?

Install the tooling globally:

npm install --global supervisor

Set up your project in local folder:

mkdir project
cd project
npm init -y
npm install --save request     # install to project/node_modules
node index.js                  # start your app