react-native-simple-compass/index.js at master · vnil/react-native-simple-compass · GitHub

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import { NativeModules, NativeEventEmitter } from 'react-native';
const { RNSimpleCompass } = NativeModules;

let listener;

//Monkey patching
let _start = RNSimpleCompass.start;
RNSimpleCompass.start = (update_rate, callback) => {
  if (listener) {
    RNSimpleCompass.stop();
  }

  const compassEventEmitter = new NativeEventEmitter(RNSimpleCompass);
  listener = compassEventEmitter.addListener('HeadingUpdated', (degree) => {
    callback(degree);
  });

  _start(update_rate === null ? 0 : update_rate);
}

let _stop = RNSimpleCompass.stop;
RNSimpleCompass.stop = () => {
  listener && listener.remove();
  listener = null;
  _stop();
}

export default RNSimpleCompass;