declare externals directly in package.json to get them properly generated in web-test-runner.config.mjs to prevent @web/test-runner from falling back to package.json which doesn't necessarily exist

src/Umbraco.Web.UI.Client/devops/importmap/index.js

@@ -13,6 +13,7 @@ export const createImportMap = (args) => {
 
 			// replace ./dist-cms with src and remove /index.js
 			const modulePath = value.replace(/^\.\/dist-cms/, args.rootDir).replace('.js', '.ts');
+			console.log('replacing', value, 'with', modulePath)
 			const importAlias = `${packageJsonName}/${moduleName}`;
 
 			imports[importAlias] = modulePath;