router.ts — astro Source File

Source Code

import { internalFetchHeaders } from 'virtual:astro:adapter-config/client';
import type { TransitionBeforePreparationEvent } from './events.js';
import {
	doPreparation,
	doSwap,
	TRANSITION_AFTER_SWAP,
	onPageLoad,
	triggerEvent,
	updateScrollPosition,
} from './events.js';
import { detectScriptExecuted } from './swap-functions.js';
import type { Direction, Fallback, Options } from './types.js';

type State = {
	index: number;
	scrollX: number;
	scrollY: number;
};
type Navigation = { controller: AbortController };
type Transition = {
	// The view transitions object (API and simulation)
	viewTransition?: ViewTransition;
	// Simulation: Whether transition was skipped
	transitionSkipped: boolean;
	// Simulation: The resolve function of the finished promise
	viewTransitionFinished?: () => void;
};

const inBrowser = import.meta.env.SSR === false;

export const supportsViewTransitions = inBrowser && !!document.startViewTransition;

export const transitionEnabledOnThisPage = () =>
	inBrowser && !!document.querySelector('[name="astro-view-transitions-enabled"]');

const samePage = (thisLocation: URL, otherLocation: URL) =>
	thisLocation.pathname === otherLocation.pathname && thisLocation.search === otherLocation.search;

// The previous navigation that might still be in processing
let mostRecentNavigation: Navigation | undefined;
// The previous transition that might still be in processing
let mostRecentTransition: Transition | undefined;
// When we traverse the history, the window.location is already set to the new location.
// This variable tells us where we came from
let originalLocation: URL;

const announce = () => {
	let div = document.createElement('div');
	div.setAttribute('aria-live', 'assertive');
	div.setAttribute('aria-atomic', 'true');
	div.className = 'astro-route-announcer';
	document.body.append(div);
	setTimeout(
		() => {
			let title = document.title || document.querySelector('h1')?.textContent || location.pathname;
			div.textContent = title;
		},
		// Much thought went into this magic number; the gist is that screen readers
		// need to see that the element changed and might not do so if it happens
		// too quickly.
// ... (674 more lines)