The npm warning states that a certain package requires a peer dependency to be installed, but no such dependency is currently installed. It is

Question

The npm warning states that a certain package requires a peer dependency to be installed, but no such dependency is currently installed. It is

After downloading a project from github, I encountered warnings during the npm install process. Attempting to resolve these issues based on a solution found in this question led me into a problem as certain packages demanded multiple versions of other dependencies, causing the dependency list to expand significantly.

Is there a viable solution for this issue?

Errors Included:
- @angular/core requires a peer of @angular/core@^4.3.0 but none is installed.
- @angular/common requires a peer of @angular/common@^4.3.0 but none is installed.
- and many more...

The contents of the package.json file are:

{
  "name": "fireplace",
  "version": "0.0.0",
  "license": "MIT",
  "devDependencies": {
    ...
  },
  "dependencies": {
    ...
  }
}

ng serve returned errors starting with: - Cannot find module '@angular/cdk/bidi' - Cannot find module '@angular/material/typings/core/portal' - and extending to several more modules... The compilation failed due to unresolved module imports in the codebase. Webpack was unable to compile the project successfully, presenting various import errors related to Angular material components and CSS files.

javascript angular typescript npm

Answer 1

Answer №1

"When you see the error message 'A requires a peer of B but none was installed', it means that A needs one of B's peers to be installed, but that specific peer is missing and the error message does not specify which peer of B is required."

Starting from npm version 3, the automatic installation of peer dependencies was disabled.

Check out NPM Blog for more information

Read the release notes of npm v3 for details

With npm version 3 and higher, you need to manually install peer dependencies as they will not be automatically installed.

Updated Solution:

To resolve this issue, use the following command for each peer dependency:

npm install --save-dev xxxxx

Deprecated Solution:

You can use npm-install-peers tool to identify and install necessary peer dependencies.

npm install -g npm-install-peers

npm-install-peers
If you encounter this error after updating a package, try deleting the 'node_modules' directory and reinstalling packages using commands such as npm install, npm cache clean, and then npm install.

Answer 2

"When you see the error message 'A requires a peer of B but none was installed', it means that A needs one of B's peers to be installed, but that specific peer is missing and the error message does not specify which peer of B is required."

Starting from npm version 3, the automatic installation of peer dependencies was disabled.

Check out NPM Blog for more information

Read the release notes of npm v3 for details

With npm version 3 and higher, you need to manually install peer dependencies as they will not be automatically installed.

Updated Solution:

To resolve this issue, use the following command for each peer dependency:

npm install --save-dev xxxxx

Deprecated Solution:

You can use npm-install-peers tool to identify and install necessary peer dependencies.

npm install -g npm-install-peers

npm-install-peers
If you encounter this error after updating a package, try deleting the 'node_modules' directory and reinstalling packages using commands such as npm install, npm cache clean, and then npm install.

Answer 3

Answer №2

When encountering each instance of the following error:

npm WARN {something} requires a peer of {other thing} but none is installed. You must install peer dependencies yourself.

Follow these steps:

$ npm install --save-dev "{other thing}"

Please take note: Make sure to include quotes if the {other thing} contains spaces, as illustrated in this example:

npm WARN <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1c6e737070696c316c70697b757231697b70757a655c2a322c322f">[email protected]</a> requires a peer of rollup@>=0.66.0 <2 but none was installed.

Solution provided below:

$ npm install --save-dev "rollup@>=0.66.0 <2"

Answer 4

When encountering each instance of the following error:

npm WARN {something} requires a peer of {other thing} but none is installed. You must install peer dependencies yourself.

Follow these steps:

$ npm install --save-dev "{other thing}"

Please take note: Make sure to include quotes if the {other thing} contains spaces, as illustrated in this example:

npm WARN <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1c6e737070696c316c70697b757231697b70757a655c2a322c322f">[email protected]</a> requires a peer of rollup@>=0.66.0 <2 but none was installed.

Solution provided below:

$ npm install --save-dev "rollup@>=0.66.0 <2"

Answer 5

Answer №3

The solution suggested to use npm-install-peers did not resolve the issue, neither did removing node_modules and rebuilding. What worked for me was running

npm install --save-dev @xxxxx/xxxxx@latest

for each warning message, replacing 'xxxxx' with the specific text mentioned in the peer warning. I only had four warnings to address, but if there were more (as in the original question), it might be beneficial to automate this process with a script.

Answer 6

The solution suggested to use npm-install-peers did not resolve the issue, neither did removing node_modules and rebuilding. What worked for me was running

npm install --save-dev @xxxxx/xxxxx@latest

for each warning message, replacing 'xxxxx' with the specific text mentioned in the peer warning. I only had four warnings to address, but if there were more (as in the original question), it might be beneficial to automate this process with a script.

Answer 7

Answer №4

npm install -g npm-install-peers

By running this command, you can automatically install all the missing peers and resolve any errors.

Answer 8

npm install -g npm-install-peers

By running this command, you can automatically install all the missing peers and resolve any errors.

Answer 9

Answer №5

Dealing with a related problem, I managed to fix it by following these steps!

npm install npm -g
npm install --save-dev @angular/cli@latest
npm install
npm start

Answer 10

Dealing with a related problem, I managed to fix it by following these steps!

npm install npm -g
npm install --save-dev @angular/cli@latest
npm install
npm start

Answer 11

Answer №6

After the release of npm7, a new feature was introduced that allows for the automatic installation of Peer Dependencies. A special algorithm has been implemented to ensure that a validly matching peer dependency is located at or above the peer-dependant's position in the node_modules tree. If this condition is met, the peer dependencies are added correctly without any issues. To take advantage of this functionality, all you need to do is upgrade to npm 7 by running the command:

npm i -g npm@7

For more information, check out this link

Answer 12

After the release of npm7, a new feature was introduced that allows for the automatic installation of Peer Dependencies. A special algorithm has been implemented to ensure that a validly matching peer dependency is located at or above the peer-dependant's position in the node_modules tree. If this condition is met, the peer dependencies are added correctly without any issues. To take advantage of this functionality, all you need to do is upgrade to npm 7 by running the command:

npm i -g npm@7

For more information, check out this link

Answer 13

Answer №7

Dealing with react-firebase-file-uploader, I faced a similar issue.

Ran into success using the command npm i {something} --legacy-peer-deps

Answer 14

Dealing with react-firebase-file-uploader, I faced a similar issue.

Ran into success using the command npm i {something} --legacy-peer-deps

Answer 15

Answer №8

These are the commands that helped me resolve my issue:

sudo npm cache clean --force
sudo npm install -g npm


sudo apt install libssl1.0-dev
sudo apt install nodejs-dev
sudo apt install node-gyp
sudo apt install npm

If you encounter the error "Cannot find module 'bcrypt'", you can fix it with the following commands:

npm install node-gyp -g
npm install bcrypt -g
npm install bcrypt --save

I hope these commands work for you too.

Answer 16

These are the commands that helped me resolve my issue:

sudo npm cache clean --force
sudo npm install -g npm


sudo apt install libssl1.0-dev
sudo apt install nodejs-dev
sudo apt install node-gyp
sudo apt install npm

If you encounter the error "Cannot find module 'bcrypt'", you can fix it with the following commands:

npm install node-gyp -g
npm install bcrypt -g
npm install bcrypt --save

I hope these commands work for you too.

Answer 17

Answer №9

I encountered a similar issue while working with AWS CDK. I found that the problem was resolved when I ran the command rm -rf node_modules before executing npm install.

Another important point to keep in mind is ensuring that all aws-cdk components are updated to the same version.

Answer 18

I encountered a similar issue while working with AWS CDK. I found that the problem was resolved when I ran the command rm -rf node_modules before executing npm install.

Another important point to keep in mind is ensuring that all aws-cdk components are updated to the same version.

Answer 19

Answer №10

Has anyone had a chance to experiment with this innovative package yet?

npm install -g install-peerdeps

It serves as an alternative to npm install -g npm-install-peers

If you're interested, you can find more information at: https://www.npmjs.com/package/install-peerdeps

Answer 20

Has anyone had a chance to experiment with this innovative package yet?

npm install -g install-peerdeps

It serves as an alternative to npm install -g npm-install-peers

If you're interested, you can find more information at: https://www.npmjs.com/package/install-peerdeps

Answer 21

Answer №11

Encountered a unique scenario where I faced difficulties while installing an Arch AUR PKGBUILD file manually. To resolve the issue, I had to remove specific folders such as 'pkg', 'src', and 'node_modules'. After doing so, the installation process completed successfully without any npm errors.

Answer 22

Encountered a unique scenario where I faced difficulties while installing an Arch AUR PKGBUILD file manually. To resolve the issue, I had to remove specific folders such as 'pkg', 'src', and 'node_modules'. After doing so, the installation process completed successfully without any npm errors.

Answer 23

Answer №12

One helpful tool to consider using is called depcheck. As defined by the author:

Depcheck is a useful tool for examining the dependencies within a project to determine how each dependency is utilized, identify any unnecessary dependencies, and pinpoint any missing dependencies in the package.json file.

Click here to learn more about depcheck

Answer 24

One helpful tool to consider using is called depcheck. As defined by the author:

Depcheck is a useful tool for examining the dependencies within a project to determine how each dependency is utilized, identify any unnecessary dependencies, and pinpoint any missing dependencies in the package.json file.

Click here to learn more about depcheck

Answer 25

Answer №13

To ensure stability, focus on using a single version of Angular and update modules accordingly for Angular 2.x:

Update @angular/flex-layout to ^2.0.0-beta.9
Upgrade @angular/material to ^2.0.0-beta.12
Ensure angularfire2 is at version ^4.0.0-rc.2
Make sure zone.js is updated to ^0.8.18
Upgrade webpack to version ^3.8.1
Add @angular/[email protected] (necessary for @angular/material)
Switch from angular2-google-maps to @agm/[email protected] (new name)

Answer 26

To ensure stability, focus on using a single version of Angular and update modules accordingly for Angular 2.x:

Update @angular/flex-layout to ^2.0.0-beta.9
Upgrade @angular/material to ^2.0.0-beta.12
Ensure angularfire2 is at version ^4.0.0-rc.2
Make sure zone.js is updated to ^0.8.18
Upgrade webpack to version ^3.8.1
Add @angular/[email protected] (necessary for @angular/material)
Switch from angular2-google-maps to @agm/[email protected] (new name)

Answer 27

Answer №14

Encountered a similar problem when trying to set up angular material CDK:

npm install --save @angular/material @angular/cdk @angular/animations

Resolved the issue by including -dev as shown below:

npm install --save-dev @angular/material @angular/cdk @angular/animations

Answer 28

Encountered a similar problem when trying to set up angular material CDK:

npm install --save @angular/material @angular/cdk @angular/animations

Resolved the issue by including -dev as shown below:

npm install --save-dev @angular/material @angular/cdk @angular/animations

Answer 29

Answer №15

If you're having trouble with file uploads, give multer a try by running this command. It did the trick for me.

npm install --save @types/multer

Answer 30

If you're having trouble with file uploads, give multer a try by running this command. It did the trick for me.

npm install --save @types/multer

Answer 31

Answer №16

Forcibly install the [package-name] using npm by running the command: npm i [package-name] --force

Remember to include the flag --force.

Answer 32

Forcibly install the [package-name] using npm by running the command: npm i [package-name] --force

Remember to include the flag --force.

The npm warning states that a certain package requires a peer dependency to be installed, but no such dependency is currently installed. It is

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