AgentHub/server/__tests__/plugin-bootstrap.test.js

/**
 * @file Tests scripts/plugin-bootstrap.js — the SessionStart bootstrap that
 * makes a plugin install self-sufficient. Covers the fast path, the Node
 * version gate, stale-lock reclaim, legacy hook removal (the duplicate-hook
 * double-counting bug) and the CLI launcher's refusal to clobber a foreign
 * `agenthub`. Every path is exercised against injected temp directories — nothing
 * here touches the real $HOME.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, beforeEach, after } = require("node:test");
const assert = require("node:assert/strict");
const fs = require("fs");
const os = require("os");
const path = require("path");

const TMP_HOME = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-bootstrap-"));
process.env.CLAUDE_HOME = TMP_HOME;
delete process.env.DASHBOARD_DATA_DIR;

const boot = require("../../scripts/plugin-bootstrap");

const RT = path.join(TMP_HOME, "agenthub", "runtime");

function resetRuntime() {
  fs.rmSync(RT, { recursive: true, force: true });
  fs.mkdirSync(RT, { recursive: true });
}

after(() => {
  fs.rmSync(TMP_HOME, { recursive: true, force: true });
});

describe("serverIsLive", () => {
  const infoPath = path.join(TMP_HOME, ".agenthub.json");

  beforeEach(() => fs.rmSync(infoPath, { force: true }));
  after(() => fs.rmSync(infoPath, { force: true }));

  it("is false with no discovery file at all", () => {
    // Regression: server-info's resolveAllDashboardPorts() falls back to
    // [DEFAULT_PORT] when nothing is live (a reasonable guess for the CLI),
    // which made the bootstrap wrongly believe a server was already running
    // and skip starting its own.
    assert.equal(boot.serverIsLive(), false);
  });

  it("is false when every recorded pid is dead", () => {
    fs.writeFileSync(
      infoPath,
      JSON.stringify({ servers: [{ port: 4820, pid: 999999, startedAt: "x" }] })
    );
    assert.equal(boot.serverIsLive(), false);
  });

  it("is true when a recorded pid is actually alive", () => {
    fs.writeFileSync(
      infoPath,
      JSON.stringify({ servers: [{ port: 4820, pid: process.pid, startedAt: "x" }] })
    );
    assert.equal(boot.serverIsLive(), true);
    assert.deepEqual(boot.liveServers(), [{ port: 4820, pid: process.pid, startedAt: "x" }]);
  });

  it("ignores an entry started before this boot, even when its pid is alive (pid reuse)", () => {
    const beforeBoot = new Date(Date.now() - os.uptime() * 1000 - 3600_000).toISOString();
    fs.writeFileSync(
      infoPath,
      JSON.stringify({ servers: [{ port: 4820, pid: process.pid, startedAt: beforeBoot }] })
    );
    assert.equal(boot.serverIsLive(), false);
    assert.deepEqual(boot.liveServers(), []);
  });
});

describe("runtime location", () => {
  it("lives under the shared data dir, not the plugin cache", () => {
    assert.equal(boot.runtimeDir(), RT);
  });
});

describe("node version gate", () => {
  it("refuses anything below 22.5 (node:sqlite is the only driver available)", () => {
    assert.equal(boot.nodeVersionOk("20.11.0"), false);
    assert.equal(boot.nodeVersionOk("22.4.1"), false);
  });

  it("accepts 22.5 and newer", () => {
    assert.equal(boot.nodeVersionOk("22.5.0"), true);
    assert.equal(boot.nodeVersionOk("24.0.0"), true);
  });
});

describe("fast path", () => {
  beforeEach(resetRuntime);

  it("is false with no recorded state", () => {
    assert.equal(boot.fastPathOk(RT), false);
  });

  it("is false when the recorded plugin version is stale", () => {
    fs.mkdirSync(path.join(RT, "node_modules"), { recursive: true });
    boot.writeState({ pluginVersion: "0.0.0-old", depsHash: boot.depsHash() }, RT);
    assert.equal(boot.fastPathOk(RT), false);
  });

  it("is false after a plugin update moved the install to a new cache dir", () => {
    const pkg = require("../../package.json");
    fs.mkdirSync(path.join(RT, "node_modules"), { recursive: true });
    boot.writeState(
      {
        pluginVersion: pkg.version,
        depsHash: boot.depsHash(),
        pluginRoot: "/old/plugin/cache/dir",
      },
      RT
    );
    assert.equal(boot.fastPathOk(RT), false);
  });

  it("is false when node_modules is missing even if state matches", () => {
    const pkg = require("../../package.json");
    boot.writeState({ pluginVersion: pkg.version, depsHash: boot.depsHash() }, RT);
    assert.equal(boot.fastPathOk(RT), false);
  });

  it("is false while the skill-plugin check has never settled", () => {
    // A machine can be fully installed and still lack the plugins the
    // pipelines drive; the worker has to run once to find that out.
    const pkg = require("../../package.json");
    fs.mkdirSync(path.join(RT, "node_modules"), { recursive: true });
    boot.writeState(
      {
        pluginVersion: pkg.version,
        depsHash: boot.depsHash(),
        pluginRoot: path.resolve(__dirname, "..", ".."),
      },
      RT
    );
    assert.equal(boot.fastPathOk(RT), false);
  });

  it("is false when the systemd unit still names a retired plugin root", () => {
    // The one failure a live server hides completely: everything is healthy
    // until the next reboot, and then the dashboard never comes back because
    // its unit points into a cache directory Claude Code has deleted. The fast
    // path has to reject it, or no SessionStart ever repairs it.
    //
    // Everything else here is deliberately HEALTHY — including a live server,
    // without which `fastPathOk` is false anyway and this test would pass
    // against the unfixed code.
    const ROOT = path.resolve(__dirname, "..", "..");
    const pkg = require("../../package.json");
    const infoPath = path.join(TMP_HOME, ".agenthub.json");
    const prevHome = process.env.HOME;
    // HOME first: `unitPath()` resolves against it, and computing the path
    // before this line points every write in this test at the REAL
    // ~/.config/systemd/user/agenthub.service — which the cleanup below then
    // deletes. (Asked how I know.)
    process.env.HOME = TMP_HOME;
    const unit = require("../../scripts/systemd-service").unitPath("agenthub");
    assert.ok(
      unit.startsWith(TMP_HOME + path.sep),
      `refusing to touch a unit outside the temp home: ${unit}`
    );

    const writeUnit = (workingDir) => {
      fs.mkdirSync(path.dirname(unit), { recursive: true });
      fs.writeFileSync(
        unit,
        "[Unit]\n# agenthub-managed-unit — regenerated on install, do not edit by hand\n" +
          `[Service]\nWorkingDirectory=${workingDir}\n`,
        "utf8"
      );
    };

    try {
      fs.mkdirSync(path.join(RT, "node_modules"), { recursive: true });
      fs.writeFileSync(
        infoPath,
        JSON.stringify({ servers: [{ port: 4820, pid: process.pid, startedAt: "x" }] })
      );
      boot.writeState(
        {
          pluginVersion: pkg.version,
          depsHash: boot.depsHash(),
          pluginRoot: ROOT,
        },
        RT
      );

      // Control: a unit naming THIS root is the steady state — fast path taken.
      writeUnit(ROOT);
      assert.equal(boot.fastPathOk(RT), true, "a current unit must not block the fast path");

      // The regression: same healthy install, unit left on a retired root.
      writeUnit("/plugins/cache/agenthub/deadbeef");
      assert.equal(boot.fastPathOk(RT), false);
    } finally {
      fs.rmSync(infoPath, { force: true });
      fs.rmSync(unit, { force: true });
      if (prevHome === undefined) delete process.env.HOME;
      else process.env.HOME = prevHome;
    }
  });
});

describe("bootstrap lock", () => {
  beforeEach(resetRuntime);

  it("is exclusive while held", () => {
    assert.equal(boot.acquireLock(RT), true);
    assert.equal(boot.acquireLock(RT), false, "a live lock must not be reclaimed");
    boot.releaseLock(RT);
    assert.equal(fs.existsSync(boot.lockPath(RT)), false);
  });

  it("reclaims a lock whose owner is dead", () => {
    fs.mkdirSync(boot.lockPath(RT), { recursive: true });
    // PID 1 is alive but not ours; use an unused high pid instead.
    fs.writeFileSync(path.join(boot.lockPath(RT), "pid"), "999999", "utf8");
    assert.equal(boot.lockIsStale(boot.lockPath(RT)), true);
    assert.equal(boot.acquireLock(RT), true);
    boot.releaseLock(RT);
  });

  it("reclaims a lock older than the stale timeout even if its pid is alive", () => {
    fs.mkdirSync(boot.lockPath(RT), { recursive: true });
    fs.writeFileSync(path.join(boot.lockPath(RT), "pid"), String(process.pid), "utf8");
    const old = Date.now() - boot.LOCK_STALE_MS - 1000;
    fs.utimesSync(boot.lockPath(RT), old / 1000, old / 1000);
    assert.equal(boot.lockIsStale(boot.lockPath(RT)), true);
    assert.equal(boot.acquireLock(RT), true);
    boot.releaseLock(RT);
  });

  it("treats a lock directory with no pid file as debris", () => {
    fs.mkdirSync(boot.lockPath(RT), { recursive: true });
    assert.equal(boot.lockIsStale(boot.lockPath(RT)), true);
  });
});

describe("legacy hook cleanup", () => {
  const settings = path.join(TMP_HOME, "settings-legacy.json");

  beforeEach(() => {
    fs.rmSync(settings, { force: true });
    fs.rmSync(`${settings}.agenthub-bak`, { force: true });
  });

  it("reports a settings file that still carries checkout hooks", () => {
    // What fastPathOk consults on every SessionStart. The strip itself only
    // runs in the worker, so without this the one defect that DOUBLES every
    // event survives on an otherwise-healthy install forever.
    fs.writeFileSync(settings, JSON.stringify({ hooks: {} }));
    assert.equal(boot.hasLegacyHooks(settings), false);

    fs.writeFileSync(
      settings,
      JSON.stringify({
        hooks: {
          PreToolUse: [
            { matcher: "*", hooks: [{ type: "command", command: "node /other/tool.js" }] },
          ],
        },
      })
    );
    assert.equal(boot.hasLegacyHooks(settings), false, "an unrelated hook is not ours");

    fs.writeFileSync(
      settings,
      JSON.stringify({
        hooks: {
          PreToolUse: [
            {
              matcher: "*",
              hooks: [
                { type: "command", command: "node /repo/scripts/hook-handler.js PreToolUse" },
              ],
            },
          ],
        },
      })
    );
    assert.equal(boot.hasLegacyHooks(settings), true);
    // Pure read: the caller is a hot path, and the file is the user's.
    assert.equal(fs.existsSync(`${settings}.agenthub-bak`), false);
  });

  it("removes checkout-installed hook entries and backs the file up first", () => {
    fs.writeFileSync(
      settings,
      JSON.stringify({
        hooks: {
          PreToolUse: [
            {
              matcher: "*",
              hooks: [
                { type: "command", command: "node /repo/scripts/hook-handler.js PreToolUse" },
              ],
            },
            { matcher: "*", hooks: [{ type: "command", command: "node /other/tool.js" }] },
          ],
          SessionStart: [
            {
              hooks: [
                { type: "command", command: "node /repo/scripts/hook-handler.js SessionStart" },
              ],
            },
          ],
        },
      })
    );
    const removed = boot.stripLegacyHooks(settings);
    assert.equal(removed, 2);

    const after = JSON.parse(fs.readFileSync(settings, "utf8"));
    assert.equal(after.hooks.PreToolUse.length, 1, "unrelated hooks must survive");
    assert.match(JSON.stringify(after.hooks.PreToolUse), /other\/tool\.js/);
    assert.equal(after.hooks.SessionStart, undefined, "an emptied list is dropped");
    assert.ok(fs.existsSync(`${settings}.agenthub-bak`), "must back up before writing");
  });

  it("never removes the plugin's own cache-resolved hook entries", () => {
    // Regression: `claude plugin install` materializes the plugin's inline
    // hooks into settings.json itself, with ${CLAUDE_PLUGIN_ROOT} resolved to
    // the cache path — confirmed against a real install. Those entries also
    // contain "hook-handler.js", so a naive substring check would strip them
    // right along with genuine checkout leftovers, killing the plugin's own
    // hooks on every session start.
    const cachePath = path.join(
      TMP_HOME,
      "plugins",
      "cache",
      "agenthub",
      "agenthub",
      "abc123",
      "scripts",
      "hook-handler.js"
    );
    fs.writeFileSync(
      settings,
      JSON.stringify({
        hooks: {
          PreToolUse: [
            {
              matcher: "*",
              hooks: [{ type: "command", command: `node "${cachePath}" PreToolUse` }],
            },
            {
              matcher: "*",
              hooks: [
                { type: "command", command: "node /repo/scripts/hook-handler.js PreToolUse" },
              ],
            },
          ],
        },
      })
    );
    const removed = boot.stripLegacyHooks(settings);
    assert.equal(removed, 1);
    const after = JSON.parse(fs.readFileSync(settings, "utf8"));
    assert.equal(after.hooks.PreToolUse.length, 1);
    assert.match(JSON.stringify(after.hooks.PreToolUse), /plugins.*cache/);
  });

  it("leaves a file with no AgentHub hooks untouched and writes no backup", () => {
    fs.writeFileSync(settings, JSON.stringify({ hooks: { Stop: [{ hooks: [] }] } }));
    assert.equal(boot.stripLegacyHooks(settings), 0);
    assert.equal(fs.existsSync(`${settings}.agenthub-bak`), false);
  });

  it("is a no-op when no settings file exists", () => {
    assert.equal(boot.stripLegacyHooks(path.join(TMP_HOME, "nope.json")), 0);
  });
});

describe("agenthub CLI launcher", () => {
  const bin = path.join(TMP_HOME, "bin");
  const target = path.join(bin, process.platform === "win32" ? "agenthub.cmd" : "agenthub");

  beforeEach(() => {
    fs.rmSync(bin, { recursive: true, force: true });
  });

  it("writes a launcher that points at the plugin's bin/agenthub.js", () => {
    assert.equal(boot.linkCli(bin), "written");
    assert.match(fs.readFileSync(target, "utf8"), /bin[/\\]agenthub\.js/);
  });

  it("is idempotent", () => {
    boot.linkCli(bin);
    assert.equal(boot.linkCli(bin), "exists");
  });

  it("never clobbers a agenthub it did not write (a linked checkout keeps winning)", () => {
    fs.mkdirSync(bin, { recursive: true });
    fs.writeFileSync(target, '#!/bin/sh\nexec node /my/checkout/bin/agenthub.js "$@"\n');
    assert.equal(boot.linkCli(bin), "foreign");
    assert.match(fs.readFileSync(target, "utf8"), /my\/checkout/);
  });

  it(
    "falls back to `node` on PATH when the pinned node binary is gone (brew upgrade)",
    { skip: process.platform === "win32" },
    () => {
      const root = path.join(TMP_HOME, "fake-root");
      fs.mkdirSync(path.join(root, "bin"), { recursive: true });
      fs.writeFileSync(
        path.join(root, "bin", "agenthub.js"),
        "console.log('ran:' + process.argv.slice(2).join(','));\n"
      );
      assert.equal(boot.linkCli(bin, root, "/nonexistent/Cellar/node/0.0.0/bin/node"), "written");
      assert.match(fs.readFileSync(target, "utf8"), /\/nonexistent\/Cellar/);
      const out = require("child_process").execFileSync("sh", [target, "a", "b c"], {
        encoding: "utf8",
        env: { ...process.env, PATH: `${path.dirname(process.execPath)}:/usr/bin:/bin` },
      });
      assert.equal(out.trim(), "ran:a,b c");
    }
  );
});

describe("plugin-open / plugin-bootstrap require cycle", () => {
  // bootstrap() lazily requires plugin-open for buildClient, and plugin-open
  // requires bootstrap at load. When plugin-open is the entry point (/agenthub-open)
  // that lazy require resolves to whatever sits on its module.exports at that
  // instant — so the assignment must come before the entry block that calls
  // bootstrap(), or /agenthub-open dies with "buildClient is not a function".
  const src = fs.readFileSync(
    path.join(__dirname, "..", "..", "scripts", "plugin-open.js"),
    "utf8"
  );

  it("assigns module.exports before running the entry block", () => {
    const exportsAt = src.indexOf("module.exports =");
    const entryAt = src.indexOf("require.main === module");
    assert.ok(exportsAt !== -1 && entryAt !== -1);
    assert.ok(exportsAt < entryAt, "module.exports must be assigned before the entry block");
  });

  it("exposes buildClient to a bootstrap that requires it back", () => {
    assert.equal(typeof require("../../scripts/plugin-open").buildClient, "function");
  });
});

describe("buildClient dependency install", () => {
  const { buildClient } = require("../../scripts/plugin-open");

  // A fake plugin root holding just enough of a client/ to copy.
  function fakeRoot() {
    const root = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-root-"));
    fs.mkdirSync(path.join(root, "client"));
    fs.writeFileSync(path.join(root, "client", "package.json"), "{}");
    return root;
  }

  // Records every npm invocation; `fails` names the subcommands that exit non-zero.
  // A successful "run build" writes the dist/ the real Vite build would produce.
  function fakeExec(calls, fails = []) {
    return (_cmd, args, cwd) => {
      calls.push(args.join(" "));
      if (fails.includes(args[0])) return false;
      if (args[0] === "run") fs.mkdirSync(path.join(cwd, "dist"), { recursive: true });
      return true;
    };
  }

  it("installs with `npm ci`, which cannot reuse a half-populated node_modules", () => {
    // Regression: `npm install` reported success against a truncated cache
    // entry, and the build then died with TS2318 — typescript's lib/*.d.ts
    // missing, so every global type (Array, Boolean, …) was undefined.
    resetRuntime();
    const calls = [];
    const result = buildClient({ rt: RT, root: fakeRoot(), exec: fakeExec(calls) });

    assert.equal(result, "built");
    assert.equal(calls[0].startsWith("ci"), true, `expected npm ci first, got ${calls[0]}`);
    assert.equal(
      calls.some((c) => c.startsWith("install")),
      false,
      "npm install must not run once ci succeeded"
    );
  });

  it("falls back to `npm install` when ci refuses the lockfile", () => {
    resetRuntime();
    const calls = [];
    const result = buildClient({ rt: RT, root: fakeRoot(), exec: fakeExec(calls, ["ci"]) });

    assert.equal(result, "built");
    assert.deepEqual(
      calls.map((c) => c.split(" ")[0]),
      ["ci", "install", "run"]
    );
  });

  it("installs devDependencies explicitly, because NODE_ENV=production omits them", () => {
    // The whole client build toolchain (vite, typescript, @types/*) is a
    // devDependency, and npm turns NODE_ENV=production into --omit=dev. Every
    // bootstrap descended from the running server inherits that env, so the
    // install dropped vite, `npm run build` failed, and the dashboard kept
    // serving the PREVIOUS version's bundle after a self-update.
    resetRuntime();
    const calls = [];
    buildClient({ rt: RT, root: fakeRoot(), exec: fakeExec(calls) });

    for (const call of calls.filter((c) => c.startsWith("ci") || c.startsWith("install"))) {
      assert.match(call, /--include=dev/, `dependency install must include dev deps: ${call}`);
    }
  });

  it("fails without building when neither install path works", () => {
    resetRuntime();
    const calls = [];
    const result = buildClient({
      rt: RT,
      root: fakeRoot(),
      exec: fakeExec(calls, ["ci", "install"]),
    });

    assert.equal(result, "failed");
    assert.equal(
      calls.some((c) => c.startsWith("run")),
      false,
      "the build must not run on a broken dependency tree"
    );
  });
});

describe("supersededBy — an old cache directory must not act", () => {
  const pluginsDir = path.join(TMP_HOME, "plugins");
  const cacheDir = path.join(pluginsDir, "cache", "sg", "agenthub");
  const oldRoot = path.join(cacheDir, "aaaaaaaaaaaa");
  const newRoot = path.join(cacheDir, "bbbbbbbbbbbb");

  function writeInstalled(installPath) {
    fs.mkdirSync(pluginsDir, { recursive: true });
    fs.writeFileSync(
      path.join(pluginsDir, "installed_plugins.json"),
      JSON.stringify({
        version: 2,
        plugins: { "agenthub@sg": [{ scope: "user", installPath }] },
      })
    );
  }

  beforeEach(() => {
    fs.rmSync(pluginsDir, { recursive: true, force: true });
    fs.mkdirSync(oldRoot, { recursive: true });
    fs.mkdirSync(newRoot, { recursive: true });
  });

  it("names the installed build when this one is not it", () => {
    writeInstalled(newRoot);
    assert.equal(boot.supersededBy(oldRoot), newRoot);
  });

  it("clears the build that IS installed", () => {
    writeInstalled(newRoot);
    assert.equal(boot.supersededBy(newRoot), null);
  });

  it("ignores an installed path that no longer exists", () => {
    // A phantom entry must never wedge a bootstrap shut.
    writeInstalled(path.join(cacheDir, "cccccccccccc"));
    assert.equal(boot.supersededBy(oldRoot), null);
  });

  it("ignores a plugin that is not a sibling of this one", () => {
    fs.mkdirSync(pluginsDir, { recursive: true });
    const other = path.join(pluginsDir, "cache", "sg", "sg-all", "0.1.0");
    fs.mkdirSync(other, { recursive: true });
    fs.writeFileSync(
      path.join(pluginsDir, "installed_plugins.json"),
      JSON.stringify({ plugins: { "sg-all@sg": [{ installPath: other }] } })
    );
    assert.equal(boot.supersededBy(oldRoot), null);
  });

  it("says nothing when there is no record to read (a git checkout)", () => {
    assert.equal(boot.supersededBy(oldRoot), null);
  });
});

describe("pruneRetiredPluginRoots", () => {
  const pluginsDir = path.join(TMP_HOME, "plugins");
  const cacheDir = path.join(pluginsDir, "cache", "sg", "agenthub");
  const settingsPath = path.join(TMP_HOME, "settings.json");

  /** Six builds, oldest first, so mtime order is deterministic. */
  function seed(names) {
    fs.rmSync(pluginsDir, { recursive: true, force: true });
    let t = Date.now() - names.length * 60_000;
    for (const n of names) {
      const dir = path.join(cacheDir, n);
      fs.mkdirSync(dir, { recursive: true });
      fs.utimesSync(dir, new Date(t), new Date(t));
      t += 60_000;
    }
  }

  const NAMES = ["v1", "v2", "v3", "v4", "v5", "current"];
  const dir = (n) => path.join(cacheDir, n);

  beforeEach(() => {
    resetRuntime();
    seed(NAMES);
    fs.rmSync(settingsPath, { force: true });
    fs.writeFileSync(path.join(pluginsDir, "installed_plugins.json"), "{}");
  });

  it("keeps the current build and the single newest retired one", () => {
    const removed = boot.pruneRetiredPluginRoots(RT, dir("current"));
    assert.equal(removed, 4); // v1..v4 go; v5 is the whole cushion
    assert.ok(fs.existsSync(dir("current")));
    assert.ok(fs.existsSync(dir("v5")));
    assert.ok(!fs.existsSync(dir("v4")));
    assert.ok(!fs.existsSync(dir("v1")));
  });

  it("never deletes a build Claude Code records as installed", () => {
    fs.writeFileSync(
      path.join(pluginsDir, "installed_plugins.json"),
      JSON.stringify({ plugins: { "agenthub@sg": [{ installPath: dir("v1") }] } })
    );
    boot.pruneRetiredPluginRoots(RT, dir("current"));
    assert.ok(fs.existsSync(dir("v1")));
  });

  it("never deletes a build the user's hooks still point at", () => {
    // A Claude Code process that has not been restarted is still executing
    // from there — deleting it breaks that session's hooks mid-flight.
    fs.writeFileSync(
      settingsPath,
      JSON.stringify({
        hooks: { SessionStart: [{ hooks: [{ command: `node "${dir("v2")}/scripts/x.js"` }] }] },
      })
    );
    boot.pruneRetiredPluginRoots(RT, dir("current"));
    assert.ok(fs.existsSync(dir("v2")));
    assert.ok(!fs.existsSync(dir("v1")));
  });

  it("refuses to touch anything outside the plugin cache", () => {
    const checkout = path.join(TMP_HOME, "checkout", "agenthub");
    const sibling = path.join(TMP_HOME, "checkout", "something-precious");
    fs.mkdirSync(checkout, { recursive: true });
    fs.mkdirSync(sibling, { recursive: true });
    assert.equal(boot.pruneRetiredPluginRoots(RT, checkout), 0);
    assert.ok(fs.existsSync(sibling));
  });
});