Fix plugin dev watcher and migration snapshot

server/src/__tests__/plugin-dev-watcher.test.ts

@@ -0,0 +1,62 @@
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, describe, expect, it } from "vitest";
+import { resolvePluginWatchTargets } from "../services/plugin-dev-watcher.js";
+
+const tempDirs: string[] = [];
+
+afterEach(() => {
+  while (tempDirs.length > 0) {
+    const dir = tempDirs.pop();
+    if (dir) rmSync(dir, { recursive: true, force: true });
+  }
+});
+
+function makeTempPluginDir(): string {
+  const dir = mkdtempSync(path.join(os.tmpdir(), "paperclip-plugin-watch-"));
+  tempDirs.push(dir);
+  return dir;
+}
+
+describe("resolvePluginWatchTargets", () => {
+  it("watches the package root plus declared build output directories", () => {
+    const pluginDir = makeTempPluginDir();
+    mkdirSync(path.join(pluginDir, "dist", "ui"), { recursive: true });
+    writeFileSync(
+      path.join(pluginDir, "package.json"),
+      JSON.stringify({
+        name: "@acme/example",
+        paperclipPlugin: {
+          manifest: "./dist/manifest.js",
+          worker: "./dist/worker.js",
+          ui: "./dist/ui",
+        },
+      }),
+    );
+    writeFileSync(path.join(pluginDir, "dist", "manifest.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "worker.js"), "export default {};\n");
+    writeFileSync(path.join(pluginDir, "dist", "ui", "index.js"), "export default {};\n");
+
+    const targets = resolvePluginWatchTargets(pluginDir);
+
+    expect(targets).toEqual([
+      { path: pluginDir, recursive: false },
+      { path: path.join(pluginDir, "dist"), recursive: true },
+      { path: path.join(pluginDir, "dist", "ui"), recursive: true },
+    ]);
+  });
+
+  it("falls back to dist when package metadata does not declare entrypoints", () => {
+    const pluginDir = makeTempPluginDir();
+    mkdirSync(path.join(pluginDir, "dist"), { recursive: true });
+    writeFileSync(path.join(pluginDir, "package.json"), JSON.stringify({ name: "@acme/example" }));
+
+    const targets = resolvePluginWatchTargets(pluginDir);
+
+    expect(targets).toEqual([
+      { path: pluginDir, recursive: false },
+      { path: path.join(pluginDir, "dist"), recursive: true },
+    ]);
+  });
+});