one/dist/esm/link/prefetchViewport.test.native.js

One is a new React Framework that makes Vite serve both native and web.

import { describe, expect, it, beforeEach, vi } from "vitest";
import { createPrefetchViewport } from "./prefetchViewport.native.js";
function _class_call_check(instance, Constructor) {
  if (!(instance instanceof Constructor)) throw new TypeError("Cannot call a class as a function");
}
function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || !1, descriptor.configurable = !0, "value" in descriptor && (descriptor.writable = !0), Object.defineProperty(target, descriptor.key, descriptor);
  }
}
function _create_class(Constructor, protoProps, staticProps) {
  return protoProps && _defineProperties(Constructor.prototype, protoProps), staticProps && _defineProperties(Constructor, staticProps), Constructor;
}
var mockIOCallback,
  mockObserved = /* @__PURE__ */new Set();
vi.stubGlobal("IntersectionObserver", /* @__PURE__ */function () {
  "use strict";

  function _class(callback) {
    _class_call_check(this, _class), mockIOCallback = callback;
  }
  return _create_class(_class, [{
    key: "observe",
    value: function (el) {
      mockObserved.add(el);
    }
  }, {
    key: "unobserve",
    value: function (el) {
      mockObserved.delete(el);
    }
  }, {
    key: "disconnect",
    value: function () {
      mockObserved.clear();
    }
  }]), _class;
}());
function simulateIntersect(el, isIntersecting) {
  mockIOCallback([{
    target: el,
    isIntersecting
  }], {});
}
describe("prefetchViewport", function () {
  var prefetched, vp;
  beforeEach(function () {
    prefetched = [], mockObserved.clear(), vp = createPrefetchViewport(), vp.start(function (href) {
      return prefetched.push(href);
    });
  }), it("prefetches when link enters viewport", function () {
    var el = {};
    vp.observe(el, "/about"), simulateIntersect(el, !0), expect(prefetched).toEqual(["/about"]);
  }), it("does not prefetch when link exits viewport", function () {
    var el = {};
    vp.observe(el, "/about"), simulateIntersect(el, !1), expect(prefetched).toEqual([]);
  }), it("only prefetches each href once", function () {
    var el = {};
    vp.observe(el, "/about"), simulateIntersect(el, !0), simulateIntersect(el, !1), simulateIntersect(el, !0), expect(prefetched).toEqual(["/about"]);
  }), it("cleanup re-enables prefetch for href", function () {
    var el = {},
      cleanup = vp.observe(el, "/about");
    simulateIntersect(el, !0), expect(prefetched).toEqual(["/about"]), cleanup(), prefetched.length = 0, vp.observe(el, "/about"), simulateIntersect(el, !0), expect(prefetched).toEqual(["/about"]);
  }), describe("memory and performance", function () {
    it("does not leak elements after cleanup", function () {
      for (var elements = [], cleanups = [], i = 0; i < 100; i++) {
        var el = {};
        elements.push(el), cleanups.push(vp.observe(el, `/page-${i}`));
      }
      expect(vp.nodes.size).toBe(100), cleanups.forEach(function (c) {
        return c();
      }), expect(vp.nodes.size).toBe(0), expect(vp.done.size).toBe(0);
    }), it("handles rapid observe/unobserve cycles", function () {
      for (var el = {}, i = 0; i < 100; i++) {
        var cleanup = vp.observe(el, "/test");
        cleanup();
      }
      expect(vp.nodes.size).toBe(0);
    });
  });
});
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