Setting a timer for a long period of timeのコンソールのwarnを非表示にする。

> react-native -v
react-native-cli: 2.0.1
react-native: 0.55.4
> exp -V
56.0.0

Setting a timer for a long period of time, i.e. multiple minutes, is a performance and correctness issue on Android as it keeps the timer module awake, and timers can only be called when the app is in the foreground. See https://github.com/facebook/react-native/issues/12981 for more info.

  constructor(props) {
    super(props)

    global.__old_console_warn = global.__old_console_warn || console.warn;
    global.console.warn = (...args) => {
      let tst = (args[0] || '') + '';
      if (tst.startsWith('Setting a timer')) {
        return;
      }
      return global.__old_console_warn.apply(console, args);
    };
  }