chore: Remove annoying sync-async warning (#16949)

.changeset/eager-cups-argue.md

@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+chore: Remove sync-in-async warning for server rendering

documentation/docs/98-reference/.generated/server-warnings.md

@@ -1,9 +0,0 @@
-<!-- This file is generated by scripts/process-messages/index.js. Do not edit! -->
-
-### experimental_async_ssr
-
-```
-Attempted to use asynchronous rendering without `experimental.async` enabled
-```
-
-Set `experimental.async: true` in your compiler options (usually in `svelte.config.js`) to use async server rendering. This render ran synchronously.

packages/svelte/messages/server-warnings/warnings.md

@@ -1,5 +0,0 @@
-## experimental_async_ssr
-
-> Attempted to use asynchronous rendering without `experimental.async` enabled
-
-Set `experimental.async: true` in your compiler options (usually in `svelte.config.js`) to use async server rendering. This render ran synchronously.

packages/svelte/src/internal/server/renderer.js

@@ -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';
 
@@ -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,

packages/svelte/src/internal/server/warnings.js

@@ -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';

packages/svelte/src/legacy/legacy-server.js

@@ -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,