WARNING: Found 'electron' but not as a devDependency, pruning anyway

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I have a problem when package my application. I have an error message “WARNING: Found ‘electron’ but not as a devDependency, pruning anyway”. Yet electron is good in the devDependency like this :

"devDependencies": {
    "@angular/cli": "~1.7.3",
    "@angular/compiler-cli": "^5.2.0",
    "@angular/language-service": "^5.2.0",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "electron": "^1.8.4",
    "electron-icon-maker": "0.0.4",
    "electron-packager": "^12.0.1",
    "jasmine-core": "~2.8.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.1.2",
    "ts-node": "~4.1.0",
    "tslint": "~5.9.1",
    "typescript": "~2.5.3"
  }

> electron-packager . --overwrite --out=release --ignore=e2e/ --platform=darwin --arch=x64

Packaging app for platform darwin x64 using electron v1.8.4
WARNING: Found 'electron' but not as a devDependency, pruning anyway
Wrote new app to release/Rekord-darwin-x64

I use npm (instead yarn like electron-builder) :

> node -v && npm -version
v6.10.3
5.7.1

Thanks for your reply,

sebast1

[welcome[bot]]

👋 Thanks for opening your first issue here! If you have a question about using Electron Packager, read the support docs. If you’re reporting a 🐞 bug, please make sure you include steps to reproduce it. Development and issue triage is community-driven, so please be patient and we will get back to you as soon as we can.

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[malept]

Move the electron dependency from dependencies to devDependencies.