Use @swc/jest

jest.config.js

@@ -1,9 +1,10 @@
-/** @type {import('ts-jest').JestConfigWithTsJest} */
 export default {
-  preset: 'ts-jest/presets/default-esm',
   clearMocks: true,
   // https://kulshekhar.github.io/ts-jest/docs/guides/esm-support/
   moduleNameMapper: {
     '^(\\.{1,2}/.*)\\.js$': '$1',
   },
+  transform: {
+    '^.+\\.(t|j)sx?$': '@swc/jest',
+  },
 }

package.json

@@ -11,6 +11,7 @@
     "@actions/core": "1.11.1"
   },
   "devDependencies": {
+    "@swc/jest": "^0.2.37",
     "@tsconfig/recommended": "1.0.8",
     "@types/jest": "29.5.14",
     "@types/node": "20.17.6",
@@ -19,7 +20,6 @@
     "eslint-plugin-jest": "28.9.0",
     "jest": "29.7.0",
     "prettier": "3.3.3",
-    "ts-jest": "29.2.5",
     "typescript": "5.7.2",
     "typescript-eslint": "8.15.0"
   },