Requiring unknown module “undefined” on react-native-maps

问题

I want to implement react-native-maps from here. But when I import MapView above on App.js with the code import MapView from 'react-native-maps'; I get this error:

Requiring unknown module "undefined".If you are sure the module is there, try restarting Metro Bundler. You may also want to run yarn, or npm install (depending on your environement).

My package.json is

{
  "name": "MyNewProject",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "npm": "^5.8.0",
    "react": "16.3.0-rc.0",
    "react-native": "0.54.4",
    "react-native-image-picker": "^0.26.7",
    "react-native-maps": "^0.20.1"
  },
  "devDependencies": {
    "babel-jest": "22.4.3",
    "babel-preset-react-native": "4.0.0",
    "jest": "22.4.3",
    "react-test-renderer": "16.3.0-rc.0"
  },
  "jest": {
    "preset": "react-native"
  }
}

回答1:

Try changing this from your package.json "react-native-maps": "^0.20.1" into this "react-native-maps": "https://github.com/react-community/react-native-maps.git"` to ensure that you will use the master branch as suggested here https://github.com/react-community/react-native-maps/issues/2051#issuecomment-371530715

来源：https://stackoverflow.com/questions/49588806/requiring-unknown-module-undefined-on-react-native-maps