[fix] Apply updated stuff (and other page properties) when `get_n…

…avigation_result_from_branch` called (#4392)

* add test

* apply updated props.page when update / goto page

* add changeset

* fix lint

* fix formatting

* update page store more conservatively

Co-authored-by: Rich Harris <hello@rich-harris.dev>

.changeset/serious-elephants-dress.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+apply updated `props.page` when update or goto page

packages/kit/src/runtime/client/client.js

@@ -27,6 +27,8 @@ const routes = parse(components, dictionary, matchers);
 const default_layout = components[0]();
 const default_error = components[1]();
 
+const root_stuff = {};
+
 // We track the scroll position associated with each history entry in sessionStorage,
 // rather than on history.state itself, because when navigation is driven by
 // popstate it's too late to update the scroll position associated with the
@@ -86,10 +88,12 @@ export function create_client({ target, session, base, trailing_slash }) {
 
 	/** @type {import('./types').NavigationState} */
 	let current = {
-		// @ts-ignore - we need the initial value to be null
-		url: null,
+		branch: [],
+		error: null,
 		session_id: 0,
-		branch: []
+		stuff: root_stuff,
+		// @ts-ignore - we need the initial value to be null
+		url: null
 	};
 
 	let started = false;
@@ -364,7 +368,7 @@ export function create_client({ target, session, base, trailing_slash }) {
 	 *   stuff: Record<string, any>;
 	 *   branch: Array<import('./types').BranchNode | undefined>;
 	 *   status: number;
-	 *   error?: Error;
+	 *   error: Error | null;
 	 *   routeId: string | null;
 	 * }} opts
 	 */
@@ -387,6 +391,8 @@ export function create_client({ target, session, base, trailing_slash }) {
 				url,
 				params,
 				branch,
+				error,
+				stuff,
 				session_id
 			},
 			props: {
@@ -399,7 +405,13 @@ export function create_client({ target, session, base, trailing_slash }) {
 			result.props[`props_${i}`] = loaded ? await loaded.props : null;
 		}
 
-		if (!current.url || url.href !== current.url.href) {
+		const page_changed =
+			!current.url ||
+			url.href !== current.url.href ||
+			current.error !== error ||
+			current.stuff !== stuff;
+
+		if (page_changed) {
 			result.props.page = { error, params, routeId, status, stuff, url };
 
 			// TODO remove this for 1.0
@@ -583,14 +595,14 @@ export function create_client({ target, session, base, trailing_slash }) {
 		let branch = [];
 
 		/** @type {Record<string, any>} */
-		let stuff = {};
+		let stuff = root_stuff;
 		let stuff_changed = false;
 
 		/** @type {number | undefined} */
 		let status = 200;
 
-		/** @type {Error | undefined} */
-		let error;
+		/** @type {Error | null} */
+		let error = null;
 
 		// preload modules
 		a.forEach((loader) => loader());

packages/kit/src/runtime/client/types.d.ts

@@ -68,8 +68,10 @@ export type BranchNode = {
 };
 
 export type NavigationState = {
-	url: URL;
-	params: Record<string, string>;
 	branch: Array<BranchNode | undefined>;
+	error: Error | null;
+	params: Record<string, string>;
 	session_id: number;
+	stuff: Record<string, any>;
+	url: URL;
 };

packages/kit/test/apps/basics/src/routes/store/stuff/__error.svelte

@@ -9,3 +9,10 @@
 		};
 	}
 </script>
+
+<script>
+	import { page } from '$app/stores';
+	import { goto } from '$app/navigation';
+</script>
+
+<button id="reload-button" on:click={() => goto($page.url.toString())}>Reload</button>

packages/kit/test/apps/basics/src/routes/store/stuff/__layout.svelte

@@ -15,6 +15,6 @@
 
 <div id="store-stuff">{JSON.stringify($page.stuff)}</div>
 
-<nav><a href="/store/stuff/xxx">xxx</a> <a href="/store/stuff/yyy">yyy</a> <a href="/store/stuff/zzz">zzz</a></nav>
+<nav><a href="/store/stuff/xxx">xxx</a> <a href="/store/stuff/yyy">yyy</a> <a href="/store/stuff/zzz">zzz</a> <a href="/store/stuff/foo">foo</a></nav>
 
 <slot />

packages/kit/test/apps/basics/src/routes/store/stuff/foo.svelte

@@ -0,0 +1,27 @@
+<script context="module">
+	let is_first = true;
+
+	export function load() {
+		if (is_first) {
+			is_first = false;
+			throw new Error('uh oh');
+		}
+
+		return {
+			stuff: {
+				foo: true
+			},
+			props: {
+				number: 2
+			}
+		};
+	}
+</script>
+
+<script>
+	export let number;
+</script>
+
+<h1>stuff - foo</h1>
+<p>Number prop: {number}</p>
+<a href="/store">store</a>

packages/kit/test/apps/basics/test/test.js

@@ -1590,11 +1590,11 @@ test.describe.parallel('$app/stores', () => {
 		await page.goto('/store');
 
 		expect(await page.textContent('h1')).toBe('Test');
-		expect(await page.textContent('h2')).toBe('Calls: 1');
+		expect(await page.textContent('h2')).toBe(javaScriptEnabled ? 'Calls: 2' : 'Calls: 1');
 
 		await clicknav('a[href="/store/result"]');
 		expect(await page.textContent('h1')).toBe('Result');
-		expect(await page.textContent('h2')).toBe(javaScriptEnabled ? 'Calls: 1' : 'Calls: 0');
+		expect(await page.textContent('h2')).toBe(javaScriptEnabled ? 'Calls: 2' : 'Calls: 0');
 
 		const oops = await page.evaluate(() => window.oops);
 		expect(oops).toBeUndefined();
@@ -1623,6 +1623,26 @@ test.describe.parallel('$app/stores', () => {
 		);
 	});
 
+	test('should load stuff after reloading by goto', async ({
+		page,
+		clicknav,
+		javaScriptEnabled
+	}) => {
+		const stuff1 = JSON.stringify({ name: 'SvelteKit', value: 789, error: 'uh oh' });
+		const stuff2 = JSON.stringify({ name: 'SvelteKit', value: 123, foo: true });
+		await page.goto('/store/stuff/www');
+
+		await clicknav('a[href="/store/stuff/foo"]');
+		expect(await page.textContent('#store-stuff')).toBe(stuff1);
+
+		await clicknav('#reload-button');
+		expect(await page.textContent('#store-stuff')).toBe(javaScriptEnabled ? stuff2 : stuff1);
+
+		await clicknav('a[href="/store/stuff/zzz"]');
+		await clicknav('a[href="/store/stuff/foo"]');
+		expect(await page.textContent('#store-stuff')).toBe(stuff2);
+	});
+
 	test('navigating store contains from and to', async ({ app, page, javaScriptEnabled }) => {
 		await page.goto('/store/navigating/a');