How to use the @nativescript/core/ui/frame.Frame function in @nativescript/core

function createFrame(i: number, page: Page) {
    const frame = new Frame();
    frame.navigate(() => page);
    frame.id = `Tab${i} Frame${i}`;

    return frame;
}

function createFrame(i: number, page: Page) {
    const frame = new Frame();
    frame.navigate(() => page);
    frame.id = `Tab${i} Frame${i}`;

    return frame;
}

export function test_frame_retrieval_API_when_navigating() {
    const initialFrame = new Frame();
    initialFrame.id = "initialFrame";
    initialFrame.navigate(() => new Page());

    const initialTopmost = Frame.topmost();
    const initialFrameById = Frame.getFrameById("initialFrame");

    TKUnit.assertEqual(initialTopmost, initialFrame);
    TKUnit.assertEqual(initialFrameById, initialFrame);

    const newFrame = new Frame();
    newFrame.id = "newFrame";
    newFrame.navigate(() => new Page());

    const newTopmost = Frame.topmost();
    const newFrameById = Frame.getFrameById("newFrame");

    TKUnit.assertEqual(newTopmost, newFrame);
    TKUnit.assertEqual(newFrameById, newFrame);

    initialFrame.navigate(() => new Page());

    const previousTopmost = Frame.topmost();
    const previousFrameById = Frame.getFrameById("initialFrame");

    TKUnit.assertEqual(previousTopmost, initialFrame);
    TKUnit.assertEqual(previousFrameById, initialFrame);

function createTestFrameRootEntry() {
    const page = new Page();
    const frameRoot = new Frame();
    frameRoot.navigate(() => page);

    const entry: NavigationEntry = {
        create: () => frameRoot
    };

    return {
        entry: entry,
        root: frameRoot,
        page: page
    };
}

export function tearDownModule() {
    const page = new Page();
    const frame = new Frame();
    frame.navigate(() => page);

    const entry: NavigationEntry = {
        create: () => frame
    };

    waitUntilNavigatedToMaxTimeout([page], () => _resetRootView(entry));
}