fix: log a warning if fallback page overwrites prerendered page (#11661)

sveltejs · Jan 18, 2024 · 119971c · 119971c
1 parent 0bd1a4e
commit 119971c
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diff --git a/.changeset/thin-rules-travel.md b/.changeset/thin-rules-travel.md
@@ -0,0 +1,5 @@
+---
+"@sveltejs/kit": patch
+---
+
+fix: log a warning if fallback page overwrites prerendered page
diff --git a/packages/kit/src/core/adapt/builder.js b/packages/kit/src/core/adapt/builder.js
@@ -1,4 +1,5 @@
-import { existsSync, statSync, createReadStream, createWriteStream } from 'node:fs';
+import colors from 'kleur';
+import { createReadStream, createWriteStream, existsSync, statSync } from 'node:fs';
 import { extname, resolve } from 'node:path';
 import { pipeline } from 'node:stream';
 import { promisify } from 'node:util';
@@ -153,6 +154,16 @@ export function create_builder({
 				env: { ...env.private, ...env.public }
 			});
 
+			if (existsSync(dest)) {
+				console.log(
+					colors
+						.bold()
+						.yellow(
+							`Overwriting ${dest} with fallback page. Consider using a different name for the fallback.`
+						)
+				);
+			}
+
 			write(dest, fallback);
 		},