Expo eject to react-native error (Unexpected token } in JSON at position 731)

Hello, i’m trying to ejecting my project from expo to react-native because i couldnt find a good solution to write end to end tests with expo. When i write expo eject and select react-native its instantly throw error.
Error Code;

Unexpected token } in JSON at position 731
SyntaxError: Unexpected token } in JSON at position 731
    at JSON.parse (<anonymous>)
    at Object._callee$ (C:\expo-cli@2.18.2\src\commands\eject\Eject.js:16:8)
    at tryCatch (C:\Users\kocag\AppData\Roaming\npm\node_modules\expo-cli\node_modules\regenerator-runtime\runtime.js:62:40)
    at Generator.invoke [as _invoke] (C:\Users\kocag\AppData\Roaming\npm\node_modules\expo-cli\node_modules\regenerator-runtime\runtime.js:296:22)
    at Generator.prototype.<computed> [as next] (C:\Users\kocag\AppData\Roaming\npm\node_modules\expo-cli\node_modules\regenerator-runtime\runtime.js:114:21)
    at step (C:\Users\kocag\AppData\Roaming\npm\node_modules\expo-cli\node_modules\babel-runtime\helpers\asyncToGenerator.js:17:30)
    at C:\Users\kocag\AppData\Roaming\npm\node_modules\expo-cli\node_modules\babel-runtime\helpers\asyncToGenerator.js:28:13

expo diagnostics;

Expo CLI 2.18.4 environment info:
      OS: Windows 10
      Yarn: 1.15.2 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
      npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD

Could you take a look at your app.json? (and package.json as well, I think)

I’ve seen a similar error before (only difference was position) and it was due to an extra comma

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