Move the action from Deno to Node.js and Vite+

tests/entrypoints.test.ts

@@ -0,0 +1,27 @@
+import process from "node:process";
+import { fileURLToPath } from "node:url";
+
+import { expect, test } from "vite-plus/test";
+
+import { output } from "../src/command.ts";
+
+// Each phase runs as `node src/<phase>.ts` with no build step. Node loads the
+// whole import graph, stripping types, before the phase reads its first
+// variable, so failing on that variable proves every module loads.
+const PHASES: [phase: string, firstVariable: string][] = [
+  ["prepare", "ACTION_PATH"],
+  ["run", "GITEA_API_URL"],
+  ["post", "BOT_AGENTS_MANIFEST"],
+];
+
+test.each(PHASES)("Node loads the %s phase", async (phase, firstVariable) => {
+  const path = fileURLToPath(new URL(`../src/${phase}.ts`, import.meta.url));
+  const result = await output(process.execPath, {
+    args: [path],
+    env: { PATH: process.env.PATH ?? "" },
+    clearEnv: true,
+    stdin: "null",
+  });
+  expect(result.success).toBe(false);
+  expect(new TextDecoder().decode(result.stderr)).toContain(`${firstVariable} is not set`);
+});