fix: detect main module under PM2

src/infra/is-main.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+
+import { isMainModule } from "./is-main.js";
+
+describe("isMainModule", () => {
+  it("returns true when argv[1] matches current file", () => {
+    expect(
+      isMainModule({
+        currentFile: "/repo/dist/index.js",
+        argv: ["node", "/repo/dist/index.js"],
+        cwd: "/repo",
+        env: {},
+      }),
+    ).toBe(true);
+  });
+
+  it("returns true under PM2 when pm_exec_path matches current file", () => {
+    expect(
+      isMainModule({
+        currentFile: "/repo/dist/index.js",
+        argv: ["node", "/pm2/lib/ProcessContainerFork.js"],
+        cwd: "/repo",
+        env: { pm_exec_path: "/repo/dist/index.js", pm_id: "0" },
+      }),
+    ).toBe(true);
+  });
+
+  it("returns false when running under PM2 but this module is imported", () => {
+    expect(
+      isMainModule({
+        currentFile: "/repo/node_modules/clawdis/dist/index.js",
+        argv: ["node", "/repo/app.js"],
+        cwd: "/repo",
+        env: { pm_exec_path: "/repo/app.js", pm_id: "0" },
+      }),
+    ).toBe(false);
+  });
+});