"React.createContext不是一个函数“--但我没有使用它

Question

在运行反应本机应用程序时，我会得到"React.createContext不是一个函数“的错误。我在代码中搜索'createContent‘，它不存在。

知道错误的原因是什么吗？

这是一个已经在android上运行的应用程序的iOS版本。

这是我的package.json文件：

{
  "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

在您的包中，react和react-dom没有相同的版本，这就是您获得错误的原因。react-dom@16.4.0想要访问React.createContext，但react@16.2.0将无法访问。

为了使其工作，运行以下命令：

yarn upgrade react@16.4.0

或者如果您正在使用NPM：

npm install react@16.4.0

Answer 2

尝试升级以对16.4.1作出反应

Answer 3

使用npm，我通过升级到16.4.1来解决这个问题：

npm i react@16.4.1