diff --git a/scripts/check-setup-needed.js b/scripts/check-setup-needed.js
index d6929f045..154d6afe1 100644
--- a/scripts/check-setup-needed.js
+++ b/scripts/check-setup-needed.js
@@ -8,10 +8,11 @@ import path from 'path'
 import dotenv from 'dotenv'
 import { execSync } from 'child_process'
 import { L10N_CAGE_DIR, MARKDOWN_L10NS } from '../src/lib/l10n.ts'
+import { importRuntimeWithoutVite } from './l10n/utils.ts'
 
 dotenv.config()
 
-const runtimeModule = await import('../src/lib/paraglide/runtime.js')
+const runtimeModule = await importRuntimeWithoutVite()
 let activeLocales = Array.from(runtimeModule.locales)
 let setupNeeded = false
 let reason = ''
diff --git a/scripts/inlang-settings.ts b/scripts/inlang-settings.ts
index 7aad0d6fc..326f67e0a 100644
--- a/scripts/inlang-settings.ts
+++ b/scripts/inlang-settings.ts
@@ -133,7 +133,7 @@ function regenerateSettings(verbose = false): void {
 			strategy: ['url', 'cookie', 'preferredLanguage', 'baseLocale'],
 			// Fix for Netlify Edge Functions (Deno runtime)
 			disableAsyncLocalStorage: true,
-			isServer: "typeof window === 'undefined' || 'Deno' in globalThis"
+			isServer: 'import.meta.env.SSR'
 		}
 
 		// Only set urlPatterns for prefix-all-locales strategy
diff --git a/scripts/l10n/run.ts b/scripts/l10n/run.ts
index e41f4ff20..e5b5dc388 100644
--- a/scripts/l10n/run.ts
+++ b/scripts/l10n/run.ts
@@ -35,6 +35,7 @@ import {
 	MESSAGE_L10NS,
 	MESSAGE_SOURCE
 } from '../../src/lib/l10n.ts'
+import { importRuntimeWithoutVite } from './utils.ts'
 
 // Load environment variables first
 dotenv.config()
@@ -63,12 +64,12 @@ if (unknownArgs.length > 0) {
 }
 
 // Ensure inlang settings are current before importing runtime
-execSync('tsx scripts/inlang-settings.ts', { stdio: 'ignore' })
+execSync('tsx scripts/inlang-settings.ts', { stdio: 'inherit' })
 
 // This let / try / catch lets the ESM scan succeed in the absence of a runtime
 let locales: readonly string[]
 try {
-	const runtime = await import('../../src/lib/paraglide/runtime.js')
+	const runtime = await importRuntimeWithoutVite()
 	locales = runtime.locales
 	if (runtime.baseLocale !== 'en')
 		throw new Error(
diff --git a/scripts/l10n/utils.ts b/scripts/l10n/utils.ts
index f8422fe73..4eebf4ef8 100644
--- a/scripts/l10n/utils.ts
+++ b/scripts/l10n/utils.ts
@@ -259,6 +259,20 @@ export function cullCommentary(filePath: string, verbose = false) {
 
 		if (verbose) console.log(`✅ Culled LLM commentary in ${filePath}`)
 	} catch (error) {
-		console.error(`Error cleaning up file ${filePath}:`, error.message)
+		console.error(
+			`Error cleaning up file ${filePath}:`,
+			error instanceof Error ? error.message : String(error)
+		)
 	}
 }
+
+export async function importRuntimeWithoutVite(): Promise<
+	typeof import('../../src/lib/paraglide/runtime.js')
+> {
+	const runtimeString = await fs.readFile('src/lib/paraglide/runtime.js', 'utf-8')
+	const patchedRuntime = runtimeString.replace('import.meta.env.SSR', 'true')
+	const runtime = await import(
+		'data:text/javascript;base64,' + Buffer.from(patchedRuntime).toString('base64')
+	)
+	return runtime
+}
diff --git a/scripts/l10ntamer.ts b/scripts/l10ntamer.ts
index 9ea8fccf2..ca7cdaecd 100644
--- a/scripts/l10ntamer.ts
+++ b/scripts/l10ntamer.ts
@@ -11,7 +11,9 @@
 
 import fs from 'fs'
 import path from 'path'
-import { locales, localizeHref } from '../src/lib/paraglide/runtime.js'
+import { importRuntimeWithoutVite } from './l10n/utils.js'
+
+const { locales, localizeHref } = await importRuntimeWithoutVite()
 
 if (localizeHref('/test', { locale: 'en' }) === '/test') {
 	console.log('⏭️  Skipping l10ntamer - English routes not prefixed')
diff --git a/src/routes/api/simple-delay/+server.ts b/src/routes/api/simple-delay/+server.ts
index 974867c5f..6897236ab 100644
--- a/src/routes/api/simple-delay/+server.ts
+++ b/src/routes/api/simple-delay/+server.ts
@@ -19,7 +19,7 @@ export async function GET({ url }) {
 	} catch (error) {
 		return new Response(
 			JSON.stringify({
-				error: error.message,
+				error: error instanceof Error ? error.message : String(error),
 				elapsedMs: Date.now() - start
 			}),
 			{
diff --git a/src/routes/api/test-timeout/+server.ts b/src/routes/api/test-timeout/+server.ts
index a9e76b880..9e4205cf4 100644
--- a/src/routes/api/test-timeout/+server.ts
+++ b/src/routes/api/test-timeout/+server.ts
@@ -22,7 +22,7 @@ export async function GET({ url }) {
 				index: i,
 				success: false,
 				elapsed: Date.now() - reqStart,
-				error: error.message
+				error: error instanceof Error ? error.message : String(error)
 			})
 			break // Stop on first error
 		}
diff --git a/svelte.config.js b/svelte.config.js
index 9d56365f1..704b11d0b 100644
--- a/svelte.config.js
+++ b/svelte.config.js
@@ -9,7 +9,7 @@ import remarkToc from 'remark-toc'
 import remarkHeadingId from 'remark-heading-id'
 import rehypeSlug from 'rehype-slug'
 
-import { locales } from './src/lib/paraglide/runtime.js'
+import settings from './project.inlang/settings.json' with { type: 'json' }
 
 // Export configuration flags for use in build scripts
 export const USE_EDGE_FUNCTIONS = true
@@ -62,7 +62,7 @@ const config = {
 		prerender: {
 			// Allows dead links to be rendered
 			handleHttpError: 'warn',
-			entries: ['*'].concat(locales.map((locale) => '/' + locale))
+			entries: ['*'].concat(settings.locales.map((locale) => '/' + locale))
 		}
 	}
 }
diff --git a/vite.config.ts b/vite.config.ts
index c240c4abc..4ddb306a3 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -6,7 +6,9 @@ import path from 'path'
 import { defineConfig } from 'vite'
 import { isDev } from './src/lib/env'
 import { MARKDOWN_L10NS } from './src/lib/l10n'
-import { locales as compiledLocales } from './src/lib/paraglide/runtime'
+import { importRuntimeWithoutVite } from './scripts/l10n/utils'
+
+const { locales: compiledLocales } = await importRuntimeWithoutVite()
 
 function getLocaleExcludePatterns(): RegExp[] {
 	const md = path.resolve(MARKDOWN_L10NS)