NPM module removal_ [solved] after NPM uninstalls the module, the module is not removed from package.json [easy to understand]

Hello everyone , I meet you again , I'm your friend, Quan Jun .

Toss about ：

period , There is a strange phenomenon ：

use npm remove xxx or npm uninstall xxx after

xxx Not from package.json Removing the ：* HeadquarterReport git:(permission-control) * npm remove element-ui

– [email protected] node_modules/async-validator

– [email protected] node_modules/babel-helper-vue-jsx-merge-props

– [email protected] node_modules/deepmerge

– [email protected] node_modules/throttle-debounce

– [email protected] node_modules/element-ui

npm WARN [email protected] No repository field.

Results found ：

package.json

Configuration in ：

“element-ui”: “1.4.3”,

Did not actively delete ：

So install a new ：* HeadquarterReport git:(permission-control) * npm install element-ui

[email protected] /Users/crifan/dev/dev_root/xxx

└─┬ [email protected]

├── [email protected]

├── [email protected]

├── [email protected]

└── [email protected]

npm WARN [email protected] No repository field.

The results are 1.4.3

after npm uninstall package.json not update

Seems to add ：-S, –save Parameters can be updated package.json？

-》 No parameters have been added before , Why can I update ？

Try again ：* HeadquarterReport git:(permission-control) * npm uninstall element-ui -S

npm WARN [email protected] No repository field.

Sure enough, it's really updated package.json, Removed element-ui 了 .

【 summary 】

npm uninstall/remove xxx

It cannot be automatically updated package.json, hold xxx from

dependencies

devDependencies

optionalDependencies

Removing the .

Only by adding corresponding parameters ：-S, –save：dependencies

-D, –save-dev：devDependencies

-O, –save-optional：optionalDependencies

such as ：

npm uninstall element-ui -S

You can uninstall element-ui At the same time , Take it from dependencies Deleted from .

【 Postscript 】

Later adopted npm install when , It turns out that there is no update package.json：* HeadquarterReport git:(permission-control) * npm install element-ui

[email protected] /Users/crifan/dev/xxxx

└─┬ [email protected]

├── [email protected]

├── [email protected]

├── [email protected]

└── [email protected]

npm WARN [email protected] requires a peer of [email protected]^2.5.2 but none was installed.

npm WARN [email protected] No repository field.

Didn't put element-ui add .

after npm install package.json not update

It seems that parameters must also be added , Can only be ？

Then try again ：* HeadquarterReport git:(permission-control) * npm install element-ui –save

[email protected] /Users/crifan/dev/xxx

└── [email protected]

npm WARN [email protected] requires a peer of [email protected]^2.5.2 but none was installed.

npm WARN [email protected] No repository field.

Sure enough package.json It's been updated ,dependencies Combined with the ：

“element-ui”: “^2.0.1”,

【 summary 2】

Seems to be ：

npm install/uninstall xxx yes , It's just installation ／ Uninstall the corresponding module

Just add ：

–save

–save-dev

Equal parameter , Only then can the corresponding module version be required , Add to ／ Delete the package.json in .

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