@tamagui/react-native-web-lite/dist/esm/AppState/index.mjs

React Native for Web

import { canUseDOM, invariant } from "@tamagui/react-native-web-internals";
const isPrefixed =
// eslint-disable-next-line no-prototype-builtins
canUseDOM && !document.hasOwnProperty("hidden") && document.hasOwnProperty("webkitHidden");
const EVENT_TYPES = ["change", "memoryWarning"];
const VISIBILITY_CHANGE_EVENT = isPrefixed ? "webkitvisibilitychange" : "visibilitychange";
const VISIBILITY_STATE_PROPERTY = isPrefixed ? "webkitVisibilityState" : "visibilityState";
const AppStates = {
  BACKGROUND: "background",
  ACTIVE: "active"
};
class EventEmitter {
  listeners = {};
  addListener(type, handler) {
    this.listeners[type] ??= /* @__PURE__ */new Set();
    this.listeners[type].add(handler);
  }
  emit(type, state) {
    this.listeners[type]?.forEach(cb => cb(state));
  }
  removeListener(type, handler) {
    this.listeners[type]?.delete(handler);
  }
}
let hasBoundVisibilityChangeEvent = false;
const changeEmitter = new EventEmitter();
class AppState {
  static isAvailable = canUseDOM && document[VISIBILITY_STATE_PROPERTY];
  static get currentState() {
    if (!AppState.isAvailable) {
      return AppStates.ACTIVE;
    }
    switch (document[VISIBILITY_STATE_PROPERTY]) {
      case "hidden":
      case "prerender":
      case "unloaded":
        return AppStates.BACKGROUND;
      default:
        return AppStates.ACTIVE;
    }
  }
  static addEventListener(type, handler) {
    if (AppState.isAvailable) {
      invariant(EVENT_TYPES.indexOf(type) !== -1, 'Trying to subscribe to unknown event: "%s"', type);
      if (type === "change") {
        if (!hasBoundVisibilityChangeEvent) {
          hasBoundVisibilityChangeEvent = true;
          document.addEventListener(VISIBILITY_CHANGE_EVENT, () => {
            if (changeEmitter) {
              changeEmitter.emit("change", AppState.currentState);
            }
          }, false);
        }
        return changeEmitter.addListener(type, handler);
      }
    }
  }
}
export { AppState };
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