npm err [ver 2.0.2]

[m67hoff]

ionic-app-scripts@2.0.2 create some npm errors. e.g.:

npm ERR! peer dep missing: ajv@>=5.0.0, required by ajv-keywords@2.1.0

(this was working w/o error with version 1.3.12)
The app will build with 2.0.2, however it break my travis CI build - since this needs a npm install w/o any errors or warnings.

Steps to reproduce:

   ionic start --skip-link npmErr blank
   cd npmErr
   npm ls -depth 0

error:

npm ERR! peer dep missing: ajv@>=5.0.0, required by ajv-keywords@2.1.0_

in addition:

   ionic cordova platform add ios
   npm ls -depth 0

error:

npm ERR! peer dep missing: ajv@>=5.0.0, required by ajv-keywords@2.1.0
npm ERR! extraneous: node-uuid@1.4.7 /Users/mhoff/Downloads/npmErr/node_modules/cordova-ios/node_modules/node-uuid
npm ERR! extraneous: pegjs@0.9.0 /Users/mhoff/Downloads/npmErr/node_modules/cordova-ios/node_modules/pegjs
npm ERR! extraneous: simple-plist@0.1.4 /Users/mhoff/Downloads/npmErr/node_modules/cordova-ios/node_modules/simple-plist

[jgw96]

Hello, thanks for using Ionic! ionic start still does an npm install, but the latest version of npm has some bugs that are causing issues similar to this one. What version of npm are you running?

[m67hoff]

Hy,
I don't think its the "included" npm install in the ionic start. This also happens if i upgrade any older ionic 3 project (e.g. generated some weeks ago) with npm i @ionic/app-scripts@latest --save-dev

i'm using the node Latest LTS Version: v6.11.1 what includes npm 3.10.10 (because of some other sw that I use I prefer not to upgrade to npm 5.x, but a short test gives me the same error )

[alaa-alshamy]

same here,,

i got this when i run npm install in my project

├─┬ webpack@3.2.0
│ │ ├── acorn@5.1.1
│ │ ├─┬ acorn-dynamic-import@2.0.2
│ │ │ └── acorn@4.0.13
│ │ ├─┬ UNMET PEER DEPENDENCY ajv@5.2.2

[alaa-alshamy]

after diving into this i figured that the problem because there's some conflict in version of ajv in dependencies of the app-scripts

i mean there's about 4 dependencies need ajv but each one need different version of it

[jgfet]

And FYI It's still a problem with

@ionic/app-scripts@2.1.3
│ ├─┬ webpack@3.5.4
│ │ ├── acorn@5.1.1
│ │ ├─┬ acorn-dynamic-import@2.0.2
│ │ │ └── acorn@4.0.13
│ │ ├─┬ UNMET PEER DEPENDENCY ajv@5.2.2

Since this is a webpack dependency, I did:
npm install ajv@5.2.2 --save-dev
That seemed to fix things for now.

[alaa-alshamy]

@jgfet
actually i think this npm install ajv@5.2.2 --save-dev may break other packages that need previous version of ajv

because u can't have more than one version at the same time of a specific package as i know, so now after this command will have only ajv@5.2.2