react-native-update/lib/utils.ts

import { Platform } from "react-native";

export function logger(...args: any[]) {
  console.log('Pushy: ', ...args);
}

export function assertRelease() {
  if (__DEV__) {
    throw new Error('react-native-update 只能在 RELEASE 版本中运行.');
  }
}

const ping =
  Platform.OS === 'web'
    ? Promise.resolve
    : async (url: string) =>
        Promise.race([
          fetch(url, {
            method: 'HEAD',
          })
            .then(({ status }) => (status === 200 ? url : null))
            .catch(() => null),
          new Promise(r => setTimeout(() => r(null), 2000)),
        ]);


export const testUrls = async (urls?: string[]) => {
  if (!urls?.length) {
    return null;
  }
  return Promise.race(urls.map(ping)).catch(() => null);
};