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

[jgfet]

Do you want to request a feature or report a bug?
report a bug?**

What is the current behavior?

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

If the current behavior is a bug, please provide the steps to reproduce.

What is the expected behavior?
inclusion of ajv in package.json

If this is a feature request, what is motivation or use case for changing the behavior?

Please mention other relevant information such as the browser version, Node.js version, webpack version and Operating System.

ionic info

cli packages: (/opt/IonicProjects/aews_official_rc_1.0.1/node_modules)

    @ionic/cli-utils  : 1.8.1
    ionic (Ionic CLI) : 3.8.1

global packages:

    Cordova CLI : 7.0.1

local packages:

    @ionic/app-scripts : 2.1.3
    Cordova Platforms  : none
    Ionic Framework    : ionic-angular 3.6.0

System:

    Android SDK Tools : 25.2.5
    Node              : v8.2.1
    npm               : 5.3.0
    OS                : macOS Sierra
    Xcode             : Xcode 8.3.3 Build version 8E3004b

Issue seems to have been around in 3.2.0 as well. See here

[sokra]

webpack has a dependency to ajv:

https://github.com/webpack/webpack/blob/master/package.json#L8-L10

Not sure why this happens...

[TheLarkInn]

This an upstream issue?

[mbyrne00]

We've also noticed the same and had to install ajv ad a dev dependency to work around.

[marcbachmann]

This an upstream issue?

I think so, yes. I just ran into that in a project where I don't use webpack

[alexander-akait]

NPM bug npm/npm#15708.

In short: you have packages which use difference ajv and on top node_modules/ajv you have old version ajv (example in latest node-sass you have har-validator@2 which use ajv@4 package), but other package use ajv-keywords@2 which require ajv@5 (and on top node_modules/ajv-keywords you have ajv-keywords@2).

Two workaround:

1. Add to devDependencies ajv@5 package.
2. Do PR to package and update ajv to latest version.
3. Avoid using package which use old ajv version.