diff --git a/dist/index.js b/dist/index.js
index 601bcd6..1f4fca0 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -26804,42 +26804,43 @@ module.exports = parseParams
 /******/ 	
 /************************************************************************/
 var __webpack_exports__ = {};
-// This entry need to be wrapped in an IIFE because it need to be isolated against other modules in the chunk.
+// This entry need to be wrapped in an IIFE because it need to be in strict mode.
 (() => {
-const core = __nccwpck_require__(2186);
+"use strict";
+var exports = __webpack_exports__;
 
+Object.defineProperty(exports, "__esModule", ({ value: true }));
+const core_1 = __nccwpck_require__(2186);
 function parseJsonInput(param_name) {
-    const param_val = core.getInput(param_name);
+    const param_val = (0, core_1.getInput)(param_name);
     try {
         return JSON.parse(param_val);
-    } catch (error) {
+    }
+    catch (error) {
         throw new Error(`Invalid '${param_name}' input ${param_val}: ${error.message}`);
     }
 }
-
-
 function main() {
-    const needs = parseJsonInput('needs');
-    const skippable = core.getMultilineInput('skippable');
-
+    const needs = parseJsonInput("needs");
+    const skippable = (0, core_1.getMultilineInput)("skippable");
     console.debug(`needs: ${JSON.stringify(needs)}`);
     console.debug(`skippable: ${JSON.stringify(skippable)}`);
     for (const job_id of Object.keys(needs)) {
         const result = needs[job_id].result;
         console.log(`Job ${job_id} returned ${result}`);
-        if (result == 'skipped' && skippable.includes(job_id)) {
+        if (result == "skipped" && skippable.includes(job_id)) {
             continue;
         }
-        if (result != 'success') {
+        if (result != "success") {
             throw new Error(`Job ${job_id} returned ${result}`);
         }
     }
 }
-
 try {
     main();
-} catch (error) {
-  core.setFailed(error.message);
+}
+catch (error) {
+    (0, core_1.setFailed)(error.message);
 }
 
 })();
diff --git a/index.js b/index.js
deleted file mode 100644
index 3f4d072..0000000
--- a/index.js
+++ /dev/null
@@ -1,35 +0,0 @@
-const core = require('@actions/core');
-
-function parseJsonInput(param_name) {
-    const param_val = core.getInput(param_name);
-    try {
-        return JSON.parse(param_val);
-    } catch (error) {
-        throw new Error(`Invalid '${param_name}' input ${param_val}: ${error.message}`);
-    }
-}
-
-
-function main() {
-    const needs = parseJsonInput('needs');
-    const skippable = core.getMultilineInput('skippable');
-
-    console.debug(`needs: ${JSON.stringify(needs)}`);
-    console.debug(`skippable: ${JSON.stringify(skippable)}`);
-    for (const job_id of Object.keys(needs)) {
-        const result = needs[job_id].result;
-        console.log(`Job ${job_id} returned ${result}`);
-        if (result == 'skipped' && skippable.includes(job_id)) {
-            continue;
-        }
-        if (result != 'success') {
-            throw new Error(`Job ${job_id} returned ${result}`);
-        }
-    }
-}
-
-try {
-    main();
-} catch (error) {
-  core.setFailed(error.message);
-}
diff --git a/index.ts b/index.ts
new file mode 100644
index 0000000..52971b2
--- /dev/null
+++ b/index.ts
@@ -0,0 +1,36 @@
+import { getInput, getMultilineInput, setFailed } from "@actions/core";
+
+function parseJsonInput(param_name: string) {
+  const param_val = getInput(param_name);
+  try {
+    return JSON.parse(param_val);
+  } catch (error) {
+    throw new Error(
+      `Invalid '${param_name}' input ${param_val}: ${(error as Error).message}`,
+    );
+  }
+}
+
+function main() {
+  const needs = parseJsonInput("needs");
+  const skippable = getMultilineInput("skippable");
+
+  console.debug(`needs: ${JSON.stringify(needs)}`);
+  console.debug(`skippable: ${JSON.stringify(skippable)}`);
+  for (const job_id of Object.keys(needs)) {
+    const result = needs[job_id].result;
+    console.log(`Job ${job_id} returned ${result}`);
+    if (result == "skipped" && skippable.includes(job_id)) {
+      continue;
+    }
+    if (result != "success") {
+      throw new Error(`Job ${job_id} returned ${result}`);
+    }
+  }
+}
+
+try {
+  main();
+} catch (error) {
+  setFailed((error as Error).message);
+}
diff --git a/package-lock.json b/package-lock.json
index d37ad4d..3caea2a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,10 @@
         "@actions/core": "^1.10.1"
       },
       "devDependencies": {
-        "@vercel/ncc": "^0.38.1"
+        "@tsconfig/node20": "^20.1.4",
+        "@types/node": "^20.14.9",
+        "@vercel/ncc": "^0.38.1",
+        "typescript": "^5.5.2"
       }
     },
     "node_modules/@actions/core": {
@@ -41,6 +44,21 @@
         "node": ">=14"
       }
     },
+    "node_modules/@tsconfig/node20": {
+      "version": "20.1.4",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node20/-/node20-20.1.4.tgz",
+      "integrity": "sha512-sqgsT69YFeLWf5NtJ4Xq/xAF8p4ZQHlmGW74Nu2tD4+g5fAsposc4ZfaaPixVu4y01BEiDCWLRDCvDM5JOsRxg==",
+      "dev": true
+    },
+    "node_modules/@types/node": {
+      "version": "20.14.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.9.tgz",
+      "integrity": "sha512-06OCtnTXtWOZBJlRApleWndH4JsRVs1pDCc8dLSQp+7PpUpX3ePdHyeNSFTeSe7FtKyQkrlPvHwJOW3SLd8Oyg==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
+    },
     "node_modules/@vercel/ncc": {
       "version": "0.38.1",
       "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.38.1.tgz",
@@ -58,6 +76,19 @@
         "node": ">=0.6.11 <=0.7.0 || >=0.7.3"
       }
     },
+    "node_modules/typescript": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.2.tgz",
+      "integrity": "sha512-NcRtPEOsPFFWjobJEtfihkLCZCXZt/os3zf8nTxjVH3RvTSxjrCamJpbExGvYOF+tFHc3pA65qpdwPbzjohhew==",
+      "dev": true,
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
     "node_modules/undici": {
       "version": "5.28.4",
       "resolved": "https://registry.npmjs.org/undici/-/undici-5.28.4.tgz",
@@ -69,6 +100,12 @@
         "node": ">=14.0"
       }
     },
+    "node_modules/undici-types": {
+      "version": "5.26.5",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "dev": true
+    },
     "node_modules/uuid": {
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
@@ -102,6 +139,21 @@
       "resolved": "https://registry.npmjs.org/@fastify/busboy/-/busboy-2.1.1.tgz",
       "integrity": "sha512-vBZP4NlzfOlerQTnba4aqZoMhE/a9HY7HRqoOPaETQcSQuWEIyZMHGfVu6w9wGtGK5fED5qRs2DteVCjOH60sA=="
     },
+    "@tsconfig/node20": {
+      "version": "20.1.4",
+      "resolved": "https://registry.npmjs.org/@tsconfig/node20/-/node20-20.1.4.tgz",
+      "integrity": "sha512-sqgsT69YFeLWf5NtJ4Xq/xAF8p4ZQHlmGW74Nu2tD4+g5fAsposc4ZfaaPixVu4y01BEiDCWLRDCvDM5JOsRxg==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "20.14.9",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.14.9.tgz",
+      "integrity": "sha512-06OCtnTXtWOZBJlRApleWndH4JsRVs1pDCc8dLSQp+7PpUpX3ePdHyeNSFTeSe7FtKyQkrlPvHwJOW3SLd8Oyg==",
+      "dev": true,
+      "requires": {
+        "undici-types": "~5.26.4"
+      }
+    },
     "@vercel/ncc": {
       "version": "0.38.1",
       "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.38.1.tgz",
@@ -113,6 +165,12 @@
       "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
       "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="
     },
+    "typescript": {
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.2.tgz",
+      "integrity": "sha512-NcRtPEOsPFFWjobJEtfihkLCZCXZt/os3zf8nTxjVH3RvTSxjrCamJpbExGvYOF+tFHc3pA65qpdwPbzjohhew==",
+      "dev": true
+    },
     "undici": {
       "version": "5.28.4",
       "resolved": "https://registry.npmjs.org/undici/-/undici-5.28.4.tgz",
@@ -121,6 +179,12 @@
         "@fastify/busboy": "^2.0.0"
       }
     },
+    "undici-types": {
+      "version": "5.26.5",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "dev": true
+    },
     "uuid": {
       "version": "8.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
diff --git a/package.json b/package.json
index 00e259b..91fb3a0 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,9 @@
   "name": "done-action",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "dist/index.js",
   "scripts": {
-    "build": "ncc build index.js --license licenses.txt"
+    "build": "ncc build index.ts --license licenses.txt"
   },
   "repository": {
     "type": "git",
@@ -21,6 +21,9 @@
     "@actions/core": "^1.10.1"
   },
   "devDependencies": {
-    "@vercel/ncc": "^0.38.1"
+    "@tsconfig/node20": "^20.1.4",
+    "@types/node": "^20.14.9",
+    "@vercel/ncc": "^0.38.1",
+    "typescript": "^5.5.2"
   }
 }
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..b994545
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,3 @@
+{
+  "extends": "@tsconfig/node20/tsconfig.json"
+}