fix the jest config and enaable ESM for jest

Author: NShahri

jest.config.ts

@@ -0,0 +1,14 @@
+import { createDefaultEsmPreset } from 'ts-jest/dist/presets/create-jest-preset.js';
+
+const tsJestTransformCfg = createDefaultEsmPreset().transform;
+
+/** @type {import("jest").Config} **/
+export default {
+  testEnvironment: 'node',
+  transform: {
+    ...tsJestTransformCfg,
+  },
+  extensionsToTreatAsEsm: ['.ts'],
+  waitForUnhandledRejections: true,
+  testMatch: ['**/*.test.ts'],
+};

package.json

@@ -27,6 +27,7 @@
     "check": "tsc --noEmit --pretty",
     "build": "tsup",
     "watch": "tsup --watch",
+    "testonly": "NODE_OPTIONS=\"$NODE_OPTIONS --experimental-vm-modules\" jest ",
     "prerelease": ". ./resources/prepublish.sh",
     "release": "changeset publish"
   },