test: use esm in jest

Signed-off-by: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>

jest.config.ts

@@ -1,11 +1,24 @@
-module.exports = {
+import type {Config} from 'jest';
+
+const config: Config = {
   clearMocks: true,
   moduleFileExtensions: ['js', 'ts'],
   setupFiles: ['dotenv/config', '<rootDir>/src/test_setup.ts'],
   testMatch: ['**/*.test.ts'],
   testTimeout: 30000,
   transform: {
-    '^.+\\.ts$': 'ts-jest'
+    '^.+\\.ts$': [
+      'ts-jest',
+      {
+        useESM: true
+      }
+    ]
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1'
   },
   verbose: true
 };
+
+export default config;