Run tests as native ESM in modern Node.js

Author: nicolo-ribaudo

jest.config.js

@@ -1,5 +1,9 @@
 /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+
+const runNatively = !!process.features.typescript;
+
 module.exports = {
+  runner: runNatively ? 'jest-light-runner' : undefined,
   preset: 'ts-jest/presets/default-esm',
   testEnvironment: 'node',
   moduleDirectories: ['node_modules', 'src'],
@@ -9,6 +13,7 @@ module.exports = {
       diagnostics: {
         ignoreCodes: [151001],
       },
+      useESM: runNatively,
     },
   },
 };

package.json

@@ -54,6 +54,7 @@
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-prettier": "^4.0.0",
     "jest": "^27.4.7",
+    "jest-light-runner": "^0.7.10",
     "release-plan": "^0.9.0",
     "rimraf": "^3.0.2",
     "ts-jest": "^27.1.3",