UNMET PEER DEPENDENCY @angular/core@4.2.3

On installing angular2-notifications via npm to angular 4.2.3 we have:

+-- UNMET PEER DEPENDENCY @angular/core@4.2.3
+-- UNMET PEER DEPENDENCY @angular/router@4.2.3

Current Behavior

after npm install angular2-notifications I see:

+-- UNMET PEER DEPENDENCY @angular/core@4.2.3
+-- UNMET PEER DEPENDENCY @angular/router@4.2.3
`-- angular2-notifications@0.7.4

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.0.0 (node_modules\chokidar\node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
npm WARN @angular/animations@4.2.5 requires a peer of @angular/core@4.2.5 but none was installed.
npm WARN ngx-modal@0.0.29 requires a peer of @angular/core@^2.0.0 but none was installed.
npm WARN ngx-modal@0.0.29 requires a peer of @angular/router@^3.0.0 but none was installed.

Steps to Reproduce (for bugs)

run npm install angular2-notifications

[bhaskerchari]

When is the plan to upgrade it to 4.2.3 ?

[ghost]

Still getting this: ├── UNMET PEER DEPENDENCY @angular/compiler@5.0.0 ├── UNMET PEER DEPENDENCY @angular/core@5.0.0

commands like: npm install @angular/compiler-cli@5.0.0 does not solve the problem.

Edit: if found a solution on stackoverflow

UNMET PEER DEPENDENCY error is thrown when the dependencies of one or more modules specified in the package.json file is not met. Check the warnings carefully and update the package.json file with correct versions of dependencies.

Then run

rm -rf node_modules/ npm cache clean npm install

This will install all the required dependencies correctly.