"React.createContext is not a function" - but I am not using it

Question

I am getting "React.createContext is not a function" error while running a react-native application. I searched for 'createContent' in the code, it doesn't exist.

Any idea what may be the reason for the error.

It is an iOS build of an app that is already running on android.

Here is my package.json file:

{
  "name": "newapp",
  "version": "0.0.2",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest --verbose --coverage",
    "test:update": "jest --verbose --coverage --updateSnapshot",
    "test:watch": "jest --verbose --watch",
    "coverage": "jest --verbose --coverage && xdg-open ./coverage/lcov-report/index.html",
    "lint": "npx eslint --fix ./src/*"
  },
  "dependencies": {
    "apollo-boost": "0.1.17",
    "axios": "^0.18.0",
    "babel": "^6.23.0",
    "buffer": "5.1.0",
    "cross-fetch": "^3.0.0",
    "enzyme": "^3.3.0",
    "graphql": "0.13.2",
    "graphql-tag": "2.10.0",
    "jasmine-react-helpers": "^0.2.2",
    "lodash": "4.17.5",
    "moment": "2.21.0",
    "query-string": "^6.1.0",
    "react": "16.2.0",
    "react-addons-test-utils": "^15.6.2",
    "react-apollo": "2.2.4",
    "react-dom": "^16.4.0",
    "react-native": "0.51.0",
    "react-native-elements": "0.19.0",
    "react-native-fabric": "^0.5.1",
    "react-native-htmlview": "^0.12.1",
    "react-native-link-preview": "^1.3.5",
    "react-native-login": "^0.0.1-alpha.2",
    "react-native-login-keycloak": "^1.0.2",
    "react-native-onesignal": "3.2.6",
    "react-native-push-notification": "https://github.com/Dhanraj-bidchat/react-native-push-notification.git",
    "react-native-sleek-loading-indicator": "^0.1.3",
    "react-native-spinkit": "^1.1.1",
    "react-native-svg": "6.2.2",
    "react-native-swipe-cards": "^0.1.1",
    "react-native-swiper": "1.5.13",
    "react-native-vector-icons": "4.5.0",
    "react-navigation": "1.5.6",
    "react-redux": "5.0.7",
    "redux": "^3.7.2",
    "redux-logger": "^3.0.6",
    "redux-persist": "5.9.1",
    "redux-thunk": "^2.2.0",
    "victory-native": "0.17.2",
    "whatwg-fetch": "2.0.4"
  },
  "devDependencies": {
    "babel-eslint": "^8.2.3",
    "babel-jest": "^22.4.4",
    "babel-plugin-dynamic-import-node": "^1.2.0",
    "babel-plugin-syntax-dynamic-import": "^6.18.0",
    "babel-plugin-transform-class-properties": "^6.24.1",
    "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
    "babel-preset-env": "^1.7.0",
    "babel-preset-react-native": "4.0.0",
    "enzyme-adapter-react-16": "^1.1.1",
    "enzyme-to-json": "^3.3.4",
    "eslint": "^4.19.1",
    "eslint-config-standard": "^11.0.0",
    "eslint-plugin-import": "^2.12.0",
    "eslint-plugin-jest": "^21.17.0",
    "eslint-plugin-node": "^6.0.1",
    "eslint-plugin-only-warn": "^1.0.1",
    "eslint-plugin-promise": "^3.8.0",
    "eslint-plugin-react": "^7.9.1",
    "eslint-plugin-standard": "^3.1.0",
    "jest": "^23.5.0",
    "jest-resolve": "^23.0.0",
    "jest-serializer-enzyme": "^1.0.0",
    "react-native-mock-render": "^0.0.26",
    "react-test-renderer": "^16.3.2",
    "redux-mock-store": "^1.5.1",
    "sinon": "^5.0.10"
  },
  "jest": {
    "preset": "react-native",
    "setupFiles": [
      "./jest-setup.js"
    ],
    "snapshotSerializers": [
      "enzyme-to-json/serializer"
    ],
    "modulePaths": [
      "<rootDir>/src",
      "<rootDir>/node_modules"
    ],
    "transform": {
      "^.+\\.js$": "babel-jest",
      "^.+\\.jsx?$": "babel-jest"
    },
    "transformIgnorePatterns": [
      "node_modules/(?!(react-native-safe-area-view|react-navigation|react-native-htmlview|react-native-fabric|react-native-login|react-native-elements|react-native-vector-icons|react-native-spinkit|victory-pie|victory-chart|victory-core|react-native-svg|react-native|redux-persist|victory-native|react-native-swipe-cards|react-native-swiper)/)"
    ],
    "moduleNameMapper": {
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/assetsTransformer.js",
      "\\.(css|less)$": "<rootDir>/assetsTransformer.js"
    }
  }
}

Answer 1

Adding @emotion/react resulted in a similar error TypeError: React.createContext is not a function. The error disappeared after I removed @emotion/react and downgraded @emotion/styled from 11 to 10.

Answer 2

In your package react and react-dom are not having the same version which is why you get the error. [email protected] will want to have access to React.createContext but [email protected] won't have it.

In order make it work run the following command:

yarn upgrade [email protected]

Or if you are using NPM:

npm install [email protected]