Simpler config

collector.ts

@@ -3,7 +3,7 @@
 export const testableUrls = new Map<string, string[]>();
 
 export function addTests(test: string, urls: string[]): void {
-	if (import.meta.env.VITE_KEEP_URLS === '1') {
+	if (import.meta.vitest) {
 		testableUrls.set(test, urls);
 	}
 }

demo/vite.config.ts

@@ -16,4 +16,8 @@ export default defineConfig({
 			},
 		},
 	},
+	define: {
+		// eslint-disable-next-line @typescript-eslint/naming-convention -- no.
+		'import.meta.vitest': 'true',
+	},
 });

global.d.ts

@@ -1,12 +1,7 @@
 /* eslint-disable @typescript-eslint/consistent-type-definitions -- Module augmentation */
 
-/// <reference types="vite/client" />
-
-interface ImportMetaEnv {
-	readonly VITE_KEEP_URLS: string;
-}
-
 interface ImportMeta {
+	readonly vitest: unknown;
 	readonly env: ImportMetaEnv;
 }
 

package.json

@@ -27,10 +27,10 @@
 		"build": "run-p build:*",
 		"build:vite": "vite build",
 		"build:typescript": "tsc --declaration --emitDeclarationOnly",
-		"build:demo": "VITE_KEEP_URLS=1 vite build demo",
+		"build:demo": "vite build demo",
 		"prepack": "npm run build",
 		"test": "run-p build test:* xo",
-		"test:unit": "VITE_KEEP_URLS=1 vitest",
+		"test:unit": "vitest",
 		"test:demo": "svelte-check",
 		"watch": "run-p watch:*",
 		"watch:typescript": "tsc --watch --noEmit",

vite.config.ts

@@ -1,8 +1,6 @@
 import process from 'node:process';
 import {defineConfig} from 'vite';
 
-process.env.VITE_KEEP_URLS ??= '0';
-
 export default defineConfig({
 	build: {
 		lib: {
@@ -14,4 +12,7 @@ export default defineConfig({
 		outDir: 'distribution',
 		minify: false,
 	},
+	define: {
+		'import.meta.vitest': 'undefined',
+	},
 });