npm install multiple package names

What does it do when I run this command:

npm install --save-dev package1 package2

It is definitely not installing multiple packages, but it looks to be essential. (For example https://www.browsersync.io/docs/gulp)

For me it throws following ERRs:

C:\1HLAVNI\Lukas\Webdesign\lukasradek>npm install --save-dev gulp-babel gulp-add-src

> [email protected] install C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\bufferutil
> node-gyp rebuild


C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\bufferutil>if not defined npm_config_node_gyp (node "C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )  else (node "" rebuild )
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack     at failNoPython (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:401:14)
gyp ERR! stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:356:11
gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:123:15)
gyp ERR! System Windows_NT 10.0.10586
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\bufferutil
gyp ERR! node -v v6.3.1
gyp ERR! node-gyp -v v3.3.1
gyp ERR! not ok
npm WARN install:[email protected] [email protected] install: `node-gyp rebuild`
npm WARN install:[email protected] Exit status 1

> [email protected] install C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\utf-8-validate
> node-gyp rebuild


C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\utf-8-validate>if not defined npm_config_node_gyp (node "C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild )  else (node "" rebuild )
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack     at failNoPython (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:401:14)
gyp ERR! stack     at C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\configure.js:356:11
gyp ERR! stack     at FSReqWrap.oncomplete (fs.js:123:15)
gyp ERR! System Windows_NT 10.0.10586
gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\1HLAVNI\Lukas\Webdesign\lukasradek\node_modules\utf-8-validate
gyp ERR! node -v v6.3.1
gyp ERR! node-gyp -v v3.3.1
gyp ERR! not ok
npm WARN install:[email protected] [email protected] install: `node-gyp rebuild`
npm WARN install:[email protected] Exit status 1
[email protected] C:\1HLAVNI\Lukas\Webdesign\lukasradek
+-- [email protected]
| +-- [email protected]
| | `-- [email protected]
| +-- [email protected]
| | `-- [email protected]
| `-- [email protected]
|   +-- [email protected]
|   `-- [email protected]
|     `-- [email protected]
`-- [email protected]
  +-- [email protected]
  | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | | `-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | `-- [email protected]
  | |   `-- [email protected]
  | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | +-- [email protected]
  | | | `-- [email protected]
  | | |   `-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | | +-- [email protected]
  | | `-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | +-- [email protected]
  | `-- [email protected]
  `-- [email protected]

npm WARN optional Skipping failed optional dependency /chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: [email protected]
npm WARN [email protected] No repository field.

Solution 1:

Save as dependencies:

npm i package1 package2

Save as dev-dependencies:

npm i -D package1 package2

npm i --save-dev package1 package2

Solution 2:

It is definitely not installing multiple packages

Why? You're installing package1 and package2 and marking them as devDependencies with --save-dev.

As stated in the documentation, you may combine multiple arguments, and even multiple types of arguments. In your case, you're combining 2 package names published on the registry.

Solution 3:

npm install -save module1 module2

Example: npm install -save morgan chalk errorhandler lusca dotenv path mongoose

The above command will install the latest versions of morgan, chalk, errorhandler, lusca, dotenv, path and mongoose.