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chore: Remove annoying sync-async warning #16949

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Merged
merged 1 commit into from
Oct 14, 2025
+6 −29
Merged

chore: Remove annoying sync-async warning #16949

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5 changes: 5 additions & 0 deletions .changeset/eager-cups-argue.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

chore: Remove sync-in-async warning for server rendering
9 changes: 0 additions & 9 deletions documentation/docs/98-reference/.generated/server-warnings.md
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5 changes: 0 additions & 5 deletions packages/svelte/messages/server-warnings/warnings.md
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2 changes: 0 additions & 2 deletions packages/svelte/src/internal/server/renderer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,6 @@ import { async_mode_flag } from '../flags/index.js';
import { abort } from './abort-signal.js';
import { pop, push, set_ssr_context, ssr_context } from './context.js';
import * as e from './errors.js';
import * as w from './warnings.js';
import { BLOCK_CLOSE, BLOCK_OPEN } from './hydration.js';
import { attributes } from './index.js';

Expand Down Expand Up @@ -361,7 +360,6 @@ export class Renderer {
*/
(onfulfilled, onrejected) => {
if (!async_mode_flag) {
w.experimental_async_ssr();
const result = (sync ??= Renderer.#render(component, options));
const user_result = onfulfilled({
head: result.head,
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13 changes: 1 addition & 12 deletions packages/svelte/src/internal/server/warnings.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,15 +3,4 @@
import { DEV } from 'esm-env';

var bold = 'font-weight: bold';
var normal = 'font-weight: normal';

/**
* Attempted to use asynchronous rendering without `experimental.async` enabled
*/
export function experimental_async_ssr() {
if (DEV) {
console.warn(`%c[svelte] experimental_async_ssr\n%cAttempted to use asynchronous rendering without \`experimental.async\` enabled\nhttps://svelte.dev/e/experimental_async_ssr`, bold, normal);
} else {
console.warn(`https://svelte.dev/e/experimental_async_ssr`);
}
}
var normal = 'font-weight: normal';
1 change: 0 additions & 1 deletion packages/svelte/src/legacy/legacy-server.js
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Expand Up @@ -53,7 +53,6 @@ export function asClassComponent(component) {
*/
value: (onfulfilled, onrejected) => {
if (!async_mode_flag) {
w.experimental_async_ssr();
const user_result = onfulfilled({
css: munged.css,
head: munged.head,
Expand Down
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