chore: move to tsdown (#1211)

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

jest.resolver.cjs

@@ -0,0 +1,19 @@
+const { defaultResolver } = require('jest-resolve');
+module.exports = function customResolver(request, options) {
+	const resolve = options.defaultResolver || defaultResolver;
+
+	try {
+		return resolve(request, options);
+	} catch (error) {
+		if (request.startsWith('.') && request.endsWith('.js')) {
+			try {
+				return resolve(request.replace(/\.js$/, '.ts'), options);
+			} catch (tsError) {
+				tsError.cause = tsError.cause ?? error;
+				throw tsError;
+			}
+		}
+
+		throw error;
+	}
+};