nativescript-check-version/version-check.js

An easy way to check if there's an update available for the current app in the App Store or Google Play.

import * as semver from "semver"

export const parseVersion = (version) => {
  return semver.parse(semver.coerce(version), true);
};

export const diffLoose = (version1, version2) => {
  if (version1 === version2) {
    return null;
  }

  const v1 = parseVersion(version1);
  const v2 = parseVersion(version2);
  if (semver.lt(v2, v1) || semver.eq(v1, v2, true)) {
    return null;
  }

  let prefix = "";
  let defaultResult = null;
  if (v1.prerelease.length || v2.prerelease.length) {
    prefix = "pre";
    defaultResult = "prerelease";
  }
  for (let key in v1) {
    if (v1.hasOwnProperty(key) && ["major", "minor", "patch"].includes(key) && v1[key] !== v2[key]) {
      return prefix + key;
    }
  }
  return defaultResult;
};