[fix] fallback should still be generated when prerender is disabled

.changeset/grumpy-onions-applaud.md

@@ -0,0 +1,5 @@
+---
+"@sveltejs/kit": patch
+---
+
+[fix] fallback should still be generated when prerender is disabled

packages/kit/src/core/adapt/prerender.js

@@ -81,16 +81,22 @@ function chooseErrorHandler(log, onError) {
 const OK = 2;
 const REDIRECT = 3;
 
-/** @param {{
+/**
+ * @param {{
  *   cwd: string;
  *   out: string;
  *   log: Logger;
  *   config: import('types/config').ValidatedConfig;
  *   build_data: import('types/internal').BuildData;
  *   fallback?: string;
  *   all: boolean; // disregard `export const prerender = true`
- * }} opts */
+ * }} opts
+ */
 export async function prerender({ cwd, out, log, config, build_data, fallback, all }) {
+	if (!config.kit.prerender.enabled && !fallback) {
+		return;
+	}
+
 	__fetch_polyfill();
 
 	const dir = resolve_path(cwd, `${SVELTE_KIT}/output`);
@@ -264,13 +270,15 @@ export async function prerender({ cwd, out, log, config, build_data, fallback, a
 		}
 	}
 
-	for (const entry of config.kit.prerender.pages) {
-		if (entry === '*') {
-			for (const entry of build_data.entries) {
+	if (config.kit.prerender.enabled) {
+		for (const entry of config.kit.prerender.pages) {
+			if (entry === '*') {
+				for (const entry of build_data.entries) {
+					await visit(entry, null);
+				}
+			} else {
 				await visit(entry, null);
 			}
-		} else {
-			await visit(entry, null);
 		}
 	}
 

packages/kit/src/core/adapt/utils.js

@@ -31,17 +31,15 @@ export function get_utils({ cwd, config, build_data, log }) {
 		},
 
 		async prerender({ all = false, dest, fallback }) {
-			if (config.kit.prerender.enabled) {
-				await prerender({
-					out: dest,
-					all,
-					cwd,
-					config,
-					build_data,
-					fallback,
-					log
-				});
-			}
+			await prerender({
+				out: dest,
+				all,
+				cwd,
+				config,
+				build_data,
+				fallback,
+				log
+			});
 		}
 	};
 }