../../node_modules//index.d.ts(8,9): error TS2687: All declarations of 'observable' must have identical modifiers. [ERROR] Command not found: ng

[vksgautam1]

Description:
i made a new project so whenever i run a command
"ionic cordova run android"
this is giving me issue. so unable to run a build

../../node_modules//index.d.ts(8,9): error TS2687: All declarations of 'observable' must have identical modifiers. [ERROR] Command not found: ng

Steps to Reproduce:

Output:

My ionic info:

Ionic:

   ionic (Ionic CLI)          : 4.0.0-rc.8 (C:\Users\DELL\AppData\Roaming\nvm\v8.9.0\node_modules\ionic)
   Ionic Framework            : @ionic/angular 4.0.0-alpha.7
   @angular-devkit/core       : 0.7.0-rc.0
   @angular-devkit/schematics : 0.7.0-rc.0
   @angular/cli               : 6.0.8
   @ionic/ng-toolkit          : 1.0.0-rc.8
   @ionic/schematics-angular  : 1.0.0-rc.8

Cordova:

   cordova (Cordova CLI) : 8.0.0
   Cordova Platforms     : none

System:

   Android SDK Tools : 25.2.5
   NodeJS            : v8.9.0 (C:\Program Files\nodejs\node.exe)
   npm               : 5.5.1
   OS                : Windows 10

Other Information:
my package json
{ "name": "v4alpha", "version": "0.0.1", "author": "Ionic Framework", "homepage": "http://ionicframework.com/", "scripts": { "ng": "ng", "start": "ionic serve", "build": "ionic build", "test": "ng test", "lint": "ng lint", "e2e": "ng e2e" }, "private": true, "dependencies": { "@angular/common": "6.0.5", "@angular/core": "6.0.5", "@angular/forms": "6.0.5", "@angular/http": "6.0.5", "@angular/platform-browser": "6.0.5", "@angular/platform-browser-dynamic": "6.0.5", "@angular/router": "6.0.5", "@ionic-native/core": "5.0.0-beta.10", "@ionic-native/splash-screen": "5.0.0-beta.10", "@ionic-native/status-bar": "5.0.0-beta.10", "@ionic/angular": "4.0.0-alpha.7", "@ionic/ng-toolkit": "1.0.0-rc.8", "@ionic/schematics-angular": "1.0.0-rc.8", "cordova-android": "7.0.0", "cordova-plugin-device": "^2.0.2", "cordova-plugin-ionic-keyboard": "^2.0.5", "cordova-plugin-ionic-webview": "^1.1.19", "cordova-plugin-splashscreen": "^5.0.2", "cordova-plugin-whitelist": "^1.3.3", "core-js": "^2.5.3", "rxjs": "6.2.1", "zone.js": "^0.8.26" }, "devDependencies": { "@angular/cli": "6.0.8", "@angular/compiler": "6.0.5", "@angular/compiler-cli": "6.0.5", "@angular/language-service": "6.0.5", "@angular-devkit/architect": "0.7.0-rc.0", "@angular-devkit/build-angular": "0.7.0-rc.0", "@angular-devkit/core": "0.7.0-rc.0", "@angular-devkit/schematics": "0.7.0-rc.0", "@types/jasmine": "~2.8.6", "@types/jasminewd2": "~2.0.3", "@types/node": "~10.3.2", "codelyzer": "~4.3.0", "jasmine-core": "~2.99.1", "jasmine-spec-reporter": "~4.2.1", "karma": "~2.0.2", "karma-chrome-launcher": "~2.2.0", "karma-coverage-istanbul-reporter": "~2.0.0", "karma-jasmine": "~1.1.1", "karma-jasmine-html-reporter": "^0.2.2", "protractor": "~5.3.0", "ts-node": "~6.1.1", "tslint": "~5.10.0", "typescript": "~2.7.2" }, "description": "An Ionic project", "cordova": { "plugins": { "cordova-plugin-whitelist": {}, "cordova-plugin-device": {}, "cordova-plugin-splashscreen": {}, "cordova-plugin-ionic-webview": {}, "cordova-plugin-ionic-keyboard": {} }, "platforms": [ "android" ] } }

[imhoffd]

@vksgautam1 Can you paste the output of npm ls @types/zen-observable ?

[vksgautam1]

[email protected] E:\Working Project\ionic4\v4alpha
`-- (empty)

[vksgautam1]

i made another testing project and same issue happened. is there any kind of setup or environment issues.
here is another project

 ionic start newProject

What type of project would you like to create?

We recommend angular. To learn more about project types, see the CLI documentation[1]. To bypass this prompt next time,
supply the --type option.

[1]: https://ionicframework.com/docs/cli/starters.html

? Project type: angular

Let's pick the perfect starter template!

Starter templates are ready-to-go Ionic apps that come packed with everything you need to build your app. To bypass this
prompt next time, supply template, the second argument to ionic start.

? Starter template: tabs
√ Preparing directory .\newProject - done!
√ Downloading and extracting tabs starter - done!
? Integrate your new app with Cordova to target native iOS and Android? Yes
> ionic integrations enable cordova --quiet
√ Downloading integration cordova - done!
√ Copying integrations files to project - done!
[OK] Integration cordova added!

Installing dependencies may take several minutes.

     *   IONIC  DEVAPP   *

 Speed up development with the Ionic DevApp, our fast, on-device testing mobile app

  -     Test on iOS and Android without Native SDKs
  -     LiveReload for instant style and JS updates

 -->    Install DevApp: https://bit.ly/ionic-dev-app    <--

────────────────────────────────────────────────────────────

> npm i
npm WARN deprecated [email protected]: 1.2.0 should have been a major version bump
npm WARN deprecated [email protected]: All versions below 4.0.1 of Nodemailer are deprecated. See https://nodemailer.com/status/
npm WARN deprecated [email protected]: stop using this version
npm WARN deprecated [email protected]: This project is unmaintained
npm WARN deprecated [email protected]: If using 2.x branch, please upgrade to at least 2.1.6 to avoid a serious bug with socket data flow and an import issue introduced in 2.1.0
npm WARN deprecated [email protected]: Use uuid module instead
npm WARN deprecated [email protected]: This project is unmaintained

> [email protected] install E:\Working Project\ionic4\newProject\node_modules\uws
> node-gyp rebuild > build_log.txt 2>&1 || exit 0


> [email protected] install E:\Working Project\ionic4\newProject\node_modules\node-sass
> node scripts/install.js

Cached binary found at C:\Users\DELL\AppData\Roaming\npm-cache\node-sass\4.9.0\win32-x64-57_binding.node

> [email protected] postinstall E:\Working Project\ionic4\newProject\node_modules\node-sass
> node scripts/build.js

Binary found at E:\Working Project\ionic4\newProject\node_modules\node-sass\vendor\win32-x64-57\binding.node
Testing binary
Binary is fine

> @angular/[email protected] postinstall E:\Working Project\ionic4\newProject\node_modules\@angular\cli
> node ./bin/ng-update-message.js

npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules\fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})

added 1304 packages in 416.843s
> git init

     *   IONIC  PRO   *

 Supercharge your Ionic development with the Ionic Pro SDK

  -     Track runtime errors in real-time, back to your original TypeScript
  -    Push remote updates and skip the app store queue

 Learn more about Ionic Pro: https://ionicframework.com/pro

────────────────────────────────────────────────────────────

? Install the free Ionic Pro SDK and connect your app? No
> git add -A
> git commit -m "Initial commit" --no-gpg-sign

[INFO] Next Steps:

       - Go to your newly created project: cd .\newProject
       - Get Ionic DevApp for easy device testing: https://bit.ly/ionic-dev-app`
```

[vksgautam1]

for v3 projects it is working fine.

[imhoffd]

Can you tell me which module actually has the error? your pasted error strips out the module:

../../node_modules//index.d.ts(8,9): error TS2687: All declarations of 'observable' must have identical modifiers. [ERROR] Command not found: ng

Please use triple backticks when posting output it doesn't strip anything and is readable. See https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet#code-and-syntax-highlighting

[vksgautam1]

ERROR in ../../node_modules/@types/zen-observable/index.d.ts(8,9): error TS2687: All declarations of 'observable' must have identical modifiers.

related one to this is with rxjs.

https://github.com/angular/angular/issues/24245

edit-
npm i @types/zen-observable.
update to this is gonna solve this issue. 

[imhoffd]

Cool, looks like latest rxjs and zen-observable/@types/zen-observable fix this issue.