{
  "name": "rocketchat",
  "productName": "Rocket.Chat+",
  "identifier": "chat.rocket",
  "description": "Rocket.Chat Native Cross-Platform Desktop Application via Electron.",
  "version": "1.3.3",
  "build": "15",
  "author": "Rocket.Chat Support <support@rocket.chat>",
  "copyright": "© 2016, Rocket.Chat",
  "main": "background.js",
  "dependencies": {
    "@paulcbetts/system-idle-time": "^1.0.4",
    "ffi": "^2.1.0",
    "electron-notification-shim": "^1.1.0",
    "electron-toaster": "^2.0.2",
    "fs-jetpack": "^0.7.0"
  },
  "packageNameTemplate": "{{name}}-v{{version}}-{{platform}}-{{arch}}",
  "codeSignIdentity": {
    "dmg": "Developer ID Application: Konecty Informatica Ltda (DX85ENM22A)",
    "MAS": "3rd Party Mac Developer Application: Konecty Informatica Ltda (DX85ENM22A)",
    "MASInstaller": "3rd Party Mac Developer Installer: Konecty Informatica Ltda (DX85ENM22A)"
  },
  "LSApplicationCategoryType": "public.app-category.productivity",
  "scripts": {
    "postinstall": "node ../tasks/rebuild_native_modules"
  }
}

{
  "name": "rocketchat",
  "productName": "Rocket.Chat+",
  "identifier": "chat.rocket",
  "description": "Rocket.Chat Native Cross-Platform Desktop Application via Electron.",
  "version": "1.3.3",
  "build": "15",
  "author": "Rocket.Chat Support <support@rocket.chat>",
  "copyright": "© 2016, Rocket.Chat",
  "main": "background.js",
  "dependencies": {
    "@paulcbetts/system-idle-time": "^1.0.4",
    "ffi": "^2.1.0",
    "electron-notification-shim": "^1.1.0",
    "electron-toaster": "^2.0.2",
    "fs-jetpack": "^0.7.0",
    "spellchecker": "3.3.1"
  },
  "packageNameTemplate": "{{name}}-v{{version}}-{{platform}}-{{arch}}",
  "codeSignIdentity": {
    "dmg": "Developer ID Application: Konecty Informatica Ltda (DX85ENM22A)",
    "MAS": "3rd Party Mac Developer Application: Konecty Informatica Ltda (DX85ENM22A)",
    "MASInstaller": "3rd Party Mac Developer Installer: Konecty Informatica Ltda (DX85ENM22A)"
  },
  "LSApplicationCategoryType": "public.app-category.productivity",
  "scripts": {
    "postinstall": "node ../tasks/rebuild_native_modules"
  }
}

Add explicit spellchecker v3.3.1 dependency
Add explicit spellchecker v3.3.1 dependency

Spellchecking was working on Windows and Linux but not on Mac OS X. For some reason, in my tests, Mac OS X just wasn't loading the spellchecker module, adding an explicit dependency fixed it.
