fix: better assetsInlineLimit runtime type checking (#10154)

* fix: string assetsInlineLimit

* fix: better handle NaN values for `assetsInlineLimit`

* chore: prettier

* chore: simplify for requested changes

* chore: update changeset

* chore: remove tests

* chore: simplify function

* Apply suggestions from code review

---------

Co-authored-by: Arsh <69170106+lilnasy@users.noreply.github.com>

.changeset/late-bears-collect.md

@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Fixes an issue where `config.vite.build.assetsInlineLimit` could not be set as a function.

packages/astro/src/core/build/plugins/util.ts

@@ -75,14 +75,13 @@ export function shouldInlineAsset(
 	assetPath: string,
 	assetsInlineLimit: NonNullable<BuildOptions['assetsInlineLimit']>
 ) {
-	if (typeof assetsInlineLimit === 'number') {
-		return Buffer.byteLength(assetContent) < assetsInlineLimit;
-	}
-
-	const result = assetsInlineLimit(assetPath, Buffer.from(assetContent));
-	if (result != null) {
-		return result;
+	if (typeof assetsInlineLimit === 'function') {
+		const result = assetsInlineLimit(assetPath, Buffer.from(assetContent));
+		if (result != null) {
+			return result;
+		} else {
+			return Buffer.byteLength(assetContent) < 4096; // Fallback to 4096kb by default (same as Vite)
+		}
 	}
-
-	return Buffer.byteLength(assetContent) < 4096; // Fallback to 4096kb by default (same as Vite)
+	return Buffer.byteLength(assetContent) < Number(assetsInlineLimit);
 }