Merge branch 'main' into out-of-order-rendering

.changeset/slick-teeth-exist.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: better error message for global variable assignments

.changeset/small-geckos-camp.md

@@ -1,5 +0,0 @@
----
-"svelte": patch
----
-
-feat: experimental `fork` API

documentation/docs/98-reference/.generated/client-errors.md

@@ -149,7 +149,7 @@ This restriction only applies when using the `experimental.async` option, which
 ### fork_discarded
 
 ```
-Cannot commit a fork that was already committed or discarded
+Cannot commit a fork that was already discarded
 ```
 
 ### fork_timing

packages/svelte/CHANGELOG.md

@@ -1,5 +1,23 @@
 # svelte
 
+## 5.42.1
+
+### Patch Changes
+
+- fix: ignore fork `discard()` after `commit()` ([#17034](https://github.com/sveltejs/svelte/pull/17034))
+
+## 5.42.0
+
+### Minor Changes
+
+- feat: experimental `fork` API ([#17004](https://github.com/sveltejs/svelte/pull/17004))
+
+### Patch Changes
+
+- fix: always allow `setContext` before first await in component ([#17031](https://github.com/sveltejs/svelte/pull/17031))
+
+- fix: less confusing names for inspect errors ([#17026](https://github.com/sveltejs/svelte/pull/17026))
+
 ## 5.41.4
 
 ### Patch Changes

packages/svelte/messages/client-errors/errors.md

@@ -114,7 +114,7 @@ This restriction only applies when using the `experimental.async` option, which
 
 ## fork_discarded
 
-> Cannot commit a fork that was already committed or discarded
+> Cannot commit a fork that was already discarded
 
 ## fork_timing
 

packages/svelte/package.json

@@ -2,7 +2,7 @@
   "name": "svelte",
   "description": "Cybernetically enhanced web apps",
   "license": "MIT",
-  "version": "5.41.4",
+  "version": "5.42.1",
   "type": "module",
   "types": "./types/index.d.ts",
   "engines": {

packages/svelte/src/compiler/phases/2-analyze/visitors/shared/utils.js

@@ -22,7 +22,10 @@ export function validate_assignment(node, argument, context) {
 		const binding = context.state.scope.get(argument.name);
 
 		if (context.state.analysis.runes) {
-			if (binding?.node === context.state.analysis.props_id) {
+			if (
+				context.state.analysis.props_id != null &&
+				binding?.node === context.state.analysis.props_id
+			) {
 				e.constant_assignment(node, '$props.id()');
 			}
 

packages/svelte/src/internal/client/constants.js

@@ -13,6 +13,7 @@ export const INERT = 1 << 13;
 export const DESTROYED = 1 << 14;
 
 // Flags exclusive to effects
+/** Set once an effect that should run synchronously has run */
 export const EFFECT_RAN = 1 << 15;
 /**
  * 'Transparent' effects do not create a transition boundary.

packages/svelte/src/internal/client/context.js

@@ -128,7 +128,11 @@ export function setContext(key, context) {
 
 	if (async_mode_flag) {
 		var flags = /** @type {Effect} */ (active_effect).f;
-		var valid = !active_reaction && (flags & BRANCH_EFFECT) !== 0 && (flags & EFFECT_RAN) === 0;
+		var valid =
+			!active_reaction &&
+			(flags & BRANCH_EFFECT) !== 0 &&
+			// pop() runs synchronously, so this indicates we're setting context after an await
+			!(/** @type {ComponentContext} */ (component_context).i);
 
 		if (!valid) {
 			e.set_context_after_init();
@@ -173,6 +177,7 @@ export function getAllContexts() {
 export function push(props, runes = false, fn) {
 	component_context = {
 		p: component_context,
+		i: false,
 		c: null,
 		e: null,
 		s: props,
@@ -208,6 +213,8 @@ export function pop(component) {
 		context.x = component;
 	}
 
+	context.i = true;
+
 	component_context = context.p;
 
 	if (DEV) {

packages/svelte/src/internal/client/dev/inspect.js

@@ -33,8 +33,17 @@ export function inspect(get_value, inspector, show_stack = false) {
 				inspector(...snap);
 
 				if (!initial) {
+					const stack = get_stack('$inspect(...)');
 					// eslint-disable-next-line no-console
-					console.log(get_stack('UpdatedAt'));
+
+					if (stack) {
+						// eslint-disable-next-line no-console
+						console.groupCollapsed('stack trace');
+						// eslint-disable-next-line no-console
+						console.log(stack);
+						// eslint-disable-next-line no-console
+						console.groupEnd();
+					}
 				}
 			} else {
 				inspector(initial ? 'init' : 'update', ...snap);

packages/svelte/src/internal/client/dev/tracing.js

@@ -179,8 +179,7 @@ export function get_stack(label) {
 	});
 
 	define_property(error, 'name', {
-		// 'Error' suffix is required for stack traces to be rendered properly
+		value: label
-		value: `${label}Error`
 	});
 
 	return /** @type {Error & { stack: string }} */ (error);

packages/svelte/src/internal/client/error-handling.js

@@ -29,7 +29,7 @@ export function handle_error(error) {
 		// if the error occurred while creating this subtree, we let it
 		// bubble up until it hits a boundary that can handle it
 		if ((effect.f & BOUNDARY_EFFECT) === 0) {
-			if (!effect.parent && error instanceof Error) {
+			if (DEV && !effect.parent && error instanceof Error) {
 				apply_adjustments(error);
 			}
 
@@ -61,7 +61,7 @@ export function invoke_error_boundary(error, effect) {
 		effect = effect.parent;
 	}
 
-	if (error instanceof Error) {
+	if (DEV && error instanceof Error) {
 		apply_adjustments(error);
 	}
 

packages/svelte/src/internal/client/errors.js

@@ -262,12 +262,12 @@ export function flush_sync_in_effect() {
 }
 
 /**
- * Cannot commit a fork that was already committed or discarded
+ * Cannot commit a fork that was already discarded
  * @returns {never}
  */
 export function fork_discarded() {
 	if (DEV) {
-		const error = new Error(`fork_discarded\nCannot commit a fork that was already committed or discarded\nhttps://svelte.dev/e/fork_discarded`);
+		const error = new Error(`fork_discarded\nCannot commit a fork that was already discarded\nhttps://svelte.dev/e/fork_discarded`);
 
 		error.name = 'Svelte error';
 

packages/svelte/src/internal/client/proxy.js

@@ -53,7 +53,7 @@ export function proxy(value) {
 	var is_proxied_array = is_array(value);
 	var version = source(0);
 
-	var stack = DEV && tracing_mode_flag ? get_stack('CreatedAt') : null;
+	var stack = DEV && tracing_mode_flag ? get_stack('created at') : null;
 	var parent_version = update_version;
 
 	/**

packages/svelte/src/internal/client/reactivity/batch.js

@@ -913,28 +913,36 @@ export function fork(fn) {
 		e.fork_timing();
 	}
 
-	const batch = Batch.ensure();
+	var batch = Batch.ensure();
 	batch.is_fork = true;
 
-	const settled = batch.settled();
+	var committed = false;
+	var settled = batch.settled();
 
 	flushSync(fn);
 
 	// revert state changes
-	for (const [source, value] of batch.previous) {
+	for (var [source, value] of batch.previous) {
 		source.v = value;
 	}
 
 	return {
 		commit: async () => {
+			if (committed) {
+				await settled;
+				return;
+			}
+
 			if (!batches.has(batch)) {
 				e.fork_discarded();
 			}
 
+			committed = true;
+
 			batch.is_fork = false;
 
 			// apply changes
-			for (const [source, value] of batch.current) {
+			for (var [source, value] of batch.current) {
 				source.v = value;
 			}
 
@@ -945,9 +953,9 @@ export function fork(fn) {
 			// TODO maybe there's a better implementation?
 			flushSync(() => {
 				/** @type {Set<Effect>} */
-				const eager_effects = new Set();
+				var eager_effects = new Set();
 
-				for (const source of batch.current.keys()) {
+				for (var source of batch.current.keys()) {
 					mark_eager_effects(source, eager_effects);
 				}
 
@@ -959,7 +967,7 @@ export function fork(fn) {
 			await settled;
 		},
 		discard: () => {
-			if (batches.has(batch)) {
+			if (!committed && batches.has(batch)) {
 				batches.delete(batch);
 				batch.discard();
 			}

packages/svelte/src/internal/client/reactivity/deriveds.js

@@ -86,7 +86,7 @@ export function derived(fn) {
 	};
 
 	if (DEV && tracing_mode_flag) {
-		signal.created = get_stack('CreatedAt');
+		signal.created = get_stack('created at');
 	}
 
 	return signal;

packages/svelte/src/internal/client/reactivity/sources.js

@@ -76,7 +76,7 @@ export function source(v, stack) {
 	};
 
 	if (DEV && tracing_mode_flag) {
-		signal.created = stack ?? get_stack('CreatedAt');
+		signal.created = stack ?? get_stack('created at');
 		signal.updated = null;
 		signal.set_during_effect = false;
 		signal.trace = null;
@@ -186,7 +186,7 @@ export function internal_set(source, value) {
 
 		if (DEV) {
 			if (tracing_mode_flag || active_effect !== null) {
-				const error = get_stack('UpdatedAt');
+				const error = get_stack('updated at');
 
 				if (error !== null) {
 					source.updated ??= new Map();

packages/svelte/src/internal/client/runtime.js

@@ -609,7 +609,7 @@ export function get(signal) {
 			if (!tracking && !untracking && !was_read) {
 				w.await_reactivity_loss(/** @type {string} */ (signal.label));
 
-				var trace = get_stack('TracedAt');
+				var trace = get_stack('traced at');
 				// eslint-disable-next-line no-console
 				if (trace) console.warn(trace);
 			}
@@ -628,7 +628,7 @@ export function get(signal) {
 			if (signal.trace) {
 				signal.trace();
 			} else {
-				trace = get_stack('TracedAt');
+				trace = get_stack('traced at');
 
 				if (trace) {
 					var entry = tracing_expressions.entries.get(signal);

packages/svelte/src/internal/client/types.d.ts

@@ -1,6 +1,6 @@
 import type { Store } from '#shared';
 import { STATE_SYMBOL } from './constants.js';
-import type { Effect, Source, Value, Reaction } from './reactivity/types.js';
+import type { Effect, Source, Value } from './reactivity/types.js';
 
 type EventCallback = (event: Event) => boolean;
 export type EventCallbackMap = Record<string, EventCallback | EventCallback[]>;
@@ -16,6 +16,8 @@ export type ComponentContext = {
 	c: null | Map<unknown, unknown>;
 	/** deferred effects */
 	e: null | Array<() => void | (() => void)>;
+	/** True if initialized, i.e. pop() ran */
+	i: boolean;
 	/**
 	 * props — needed for legacy mode lifecycle functions, and for `createEventDispatcher`
 	 * @deprecated remove in 6.0

packages/svelte/src/version.js

@@ -4,5 +4,5 @@
  * The current version, as set in package.json.
  * @type {string}
  */
-export const VERSION = '5.41.4';
+export const VERSION = '5.42.1';
 export const PUBLIC_VERSION = '5';

packages/svelte/tests/helpers.js

@@ -201,7 +201,15 @@ export const async_mode = process.env.SVELTE_NO_ASYNC !== 'true';
  * @param {any[]} logs
  */
 export function normalise_inspect_logs(logs) {
-	return logs.map((log) => {
+	/** @type {string[]} */
+	const normalised = [];
+
+	for (const log of logs) {
+		if (log === 'stack trace') {
+			// ignore `console.group('stack trace')` in default `$inspect(...)` output
+			continue;
+		}
+
 		if (log instanceof Error) {
 			const last_line = log.stack
 				?.trim()
@@ -210,11 +218,13 @@ export function normalise_inspect_logs(logs) {
 
 			const match = last_line && /(at .+) /.exec(last_line);
 
-			return match && match[1];
+			if (match) normalised.push(match[1]);
+		} else {
+			normalised.push(log);
 		}
+	}
 
-		return log;
+	return normalised;
-	});
 }
 
 /**

packages/svelte/tests/runtime-runes/samples/async-context-throws-after-await/_config.js

@@ -0,0 +1,11 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	mode: ['client'],
+	async test() {
+		// else runtime_error is checked too soon
+		await tick();
+	},
+	runtime_error: 'set_context_after_init'
+});

packages/svelte/tests/runtime-runes/samples/async-context-throws-after-await/main.svelte

@@ -0,0 +1,7 @@
+<script>
+	import { setContext } from 'svelte';
+
+	await Promise.resolve('hi');
+
+	setContext('key', 'value');
+</script>

packages/svelte/tests/runtime-runes/samples/async-reactivity-loss-for-await/_config.js

@@ -17,7 +17,7 @@ export default test({
 			'Detected reactivity loss when reading `values[1]`. This happens when state is read in an async function after an earlier `await`'
 		);
 
-		assert.equal(warnings[1].name, 'TracedAtError');
+		assert.equal(warnings[1].name, 'traced at');
 
 		assert.equal(warnings.length, 2);
 	}

packages/svelte/tests/runtime-runes/samples/async-reactivity-loss/_config.js

@@ -20,7 +20,7 @@ export default test({
 			'Detected reactivity loss when reading `b`. This happens when state is read in an async function after an earlier `await`'
 		);
 
-		assert.equal(warnings[1].name, 'TracedAtError');
+		assert.equal(warnings[1].name, 'traced at');
 
 		assert.equal(warnings.length, 2);
 	}

packages/svelte/tests/runtime-runes/samples/async-set-context/Inner.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	import { getContext } from "svelte";
+
+  let greeting = getContext("greeting");
+</script>
+
+<p>{greeting}</p>

packages/svelte/tests/runtime-runes/samples/async-set-context/Outer.svelte

@@ -0,0 +1,9 @@
+<script lang="ts">
+	import { setContext } from "svelte";
+	import Inner from "./Inner.svelte";
+
+	setContext("greeting", "hi");
+	await Promise.resolve();
+</script>
+
+<Inner />

packages/svelte/tests/runtime-runes/samples/async-set-context/_config.js

@@ -0,0 +1,11 @@
+import { tick } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	mode: ['client', 'async-server'],
+	ssrHtml: `<p>hi</p>`,
+	async test({ assert, target }) {
+		await tick();
+		assert.htmlEqual(target.innerHTML, '<p>hi</p>');
+	}
+});

packages/svelte/tests/runtime-runes/samples/async-set-context/main.svelte

@@ -0,0 +1,7 @@
+<script lang="ts">
+	import Outer from "./Outer.svelte";
+
+	await Promise.resolve();
+</script>
+
+<Outer />

packages/svelte/tests/runtime-runes/samples/effect-loop-infinite/_config.js

@@ -14,7 +14,7 @@ export default test({
 		try {
 			flushSync(() => button.click());
 		} catch (e) {
-			assert.equal(errors.length, 1); // for whatever reason we can't get the name which should be UpdatedAtError
+			assert.equal(errors.length, 1); // for whatever reason we can't get the name which should be 'updated at'
 			assert.ok(/** @type {Error} */ (e).message.startsWith('effect_update_depth_exceeded'));
 		}
 	}

packages/svelte/tests/runtime-runes/samples/global-variable-assignment/_config.js

@@ -0,0 +1,6 @@
+import { test } from '../../test';
+
+export default test({
+	error: 'x is not defined',
+	async test() {}
+});

packages/svelte/tests/runtime-runes/samples/global-variable-assignment/foo.svelte.js

@@ -0,0 +1 @@
+x = 1;

packages/svelte/tests/runtime-runes/samples/global-variable-assignment/main.svelte

@@ -0,0 +1,3 @@
+<script>
+	import "./foo.svelte.js";
+</script>