deep signals improvements

sdk/js/alien-deepsignals/README.md

@@ -53,7 +53,7 @@ console.log(state.$count!()); // read via signal function
 
 ```ts
 type DeepSignalOptions = {
-    idGenerator?: () => string | number; // Custom ID generator function
+    idGenerator?: (pathToObject: (string | number)[]) => string | number; // Custom ID generator function
     addIdToObjects?: boolean; // Automatically add @id to plain objects
 };
 ```
@@ -84,7 +84,7 @@ When `addIdToObjects: true`, plain objects automatically receive a readonly, enu
 const state = deepSignal(
     { data: {} },
     { 
-        idGenerator: () => `urn:uuid:${crypto.randomUUID()}`,
+        idGenerator: (_path) => `urn:uuid:${crypto.randomUUID()}`,
         addIdToObjects: true 
     }
 );
@@ -191,7 +191,7 @@ import { addWithId, setSetEntrySyntheticId } from "@ng-org/alien-deepsignals";
 const state = deepSignal(
     { items: new Set() },
     { 
-        idGenerator: () => `urn:uuid:${crypto.randomUUID()}`,
+        idGenerator: (_path) => `urn:uuid:${crypto.randomUUID()}`,
         addIdToObjects: true 
     }
 );
@@ -250,7 +250,7 @@ state.s.add({ data: "test" });
 const state = deepSignal(
     { users: new Set() }, 
     { 
-        idGenerator: () => `urn:user:${crypto.randomUUID()}`,
+        idGenerator: (path) => `urn:user:${path.join("-")}:${crypto.randomUUID()}`,
         addIdToObjects: true 
     }
 );

sdk/js/alien-deepsignals/src/deepSignal.ts

@@ -59,7 +59,7 @@ export type DeepPatchSubscriber = (patches: DeepPatch[]) => void;
 /** Options for configuring deepSignal behavior. */
 export interface DeepSignalOptions {
     /** Custom function to generate synthetic IDs for objects without @id. */
-    idGenerator?: () => string | number;
+    idGenerator?: (pathToObject: (string | number)[]) => string | number;
     /** If true, add @id property to all objects in the tree. */
     addIdToObjects?: boolean;
 }
@@ -156,7 +156,7 @@ function queueDeepPatches(
     ) {
         let syntheticId: string | number;
         if (options.idGenerator) {
-            syntheticId = options.idGenerator();
+            syntheticId = options.idGenerator(basePath);
         } else {
             syntheticId = assignBlankNodeId(val);
         }
@@ -516,6 +516,7 @@ function getFromSet(
     };
     // Pre-pass to ensure any existing non-proxied object entries are proxied (enables deep patches after iteration)
     if (meta) raw.forEach(ensureEntryProxy);
+
     if (key === "add" || key === "delete" || key === "clear") {
         const fn: Function = (raw as any)[key];
         return function (this: any, ...args: any[]) {
@@ -545,7 +546,8 @@ function getFromSet(
                         ) {
                             let syntheticId: string | number;
                             if (metaNow.options.idGenerator) {
-                                syntheticId = metaNow.options.idGenerator();
+                                syntheticId =
+                                    metaNow.options.idGenerator(containerPath);
                             } else {
                                 syntheticId = assignBlankNodeId(entry);
                             }

sdk/js/alien-deepsignals/src/test/patchOptimized.test.ts

@@ -8,40 +8,40 @@ import { watch } from "../watch";
 // times traverse() executes under each strategy.
 
 describe("watch patch-only simplified performance placeholder", () => {
-  let store: any;
-  const build = (breadth = 3, depth = 3) => {
-    const make = (d: number): any => {
-      if (d === 0) return { v: 0 };
-      const obj: any = {};
-      for (let i = 0; i < breadth; i++) obj["k" + i] = make(d - 1);
-      return obj;
+    let store: any;
+    const build = (breadth = 3, depth = 3) => {
+        const make = (d: number): any => {
+            if (d === 0) return { v: 0 };
+            const obj: any = {};
+            for (let i = 0; i < breadth; i++) obj["k" + i] = make(d - 1);
+            return obj;
+        };
+        return make(depth);
     };
-    return make(depth);
-  };
 
-  beforeEach(() => {
-    store = deepSignal(build());
-  });
+    beforeEach(() => {
+        store = deepSignal(build());
+    });
 
-  function mutateAll(breadth = 3, depth = 3) {
-    const visit = (node: any, d: number) => {
-      if (d === 0) {
-        node.v++;
-        return;
-      }
-      for (let i = 0; i < breadth; i++) visit(node["k" + i], d - 1);
-    };
-    visit(store, depth);
-  }
+    function mutateAll(breadth = 3, depth = 3) {
+        const visit = (node: any, d: number) => {
+            if (d === 0) {
+                node.v++;
+                return;
+            }
+            for (let i = 0; i < breadth; i++) visit(node["k" + i], d - 1);
+        };
+        visit(store, depth);
+    }
 
-  it("receives a single batch of patches after deep mutations", async () => {
-    let batches = 0;
-    const { stopListening: stop } = watch(store, ({ patches }) => {
-      if (patches.length) batches++;
+    it("receives a single batch of patches after deep mutations", async () => {
+        let batches = 0;
+        const { stopListening: stop } = watch(store, ({ patches }) => {
+            if (patches.length) batches++;
+        });
+        mutateAll();
+        await Promise.resolve();
+        expect(batches).toBe(1);
+        stop();
     });
-    mutateAll();
-    await Promise.resolve();
-    expect(batches).toBe(1);
-    stop();
-  });
 });

sdk/js/alien-deepsignals/src/test/tier3.test.ts

@@ -1,148 +1,148 @@
 import { describe, it, expect } from "vitest";
 import { deepSignal, getDeepSignalRootId, peek } from "../deepSignal";
 import {
-  watch,
-  __traverseCount,
-  __resetTraverseCount,
-  traverse,
+    watch,
+    __traverseCount,
+    __resetTraverseCount,
+    traverse,
 } from "../watch";
 import { effect } from "../core";
 
 describe("watch advanced", () => {
-  it("basic patch watcher fires on deep mutations", async () => {
-    const st = deepSignal({ a: { b: { c: 1 } } });
-    let batches: number = 0;
-    watch(st, ({ patches }) => {
-      if (patches.length) batches++;
+    it("basic patch watcher fires on deep mutations", async () => {
+        const st = deepSignal({ a: { b: { c: 1 } } });
+        let batches: number = 0;
+        watch(st, ({ patches }) => {
+            if (patches.length) batches++;
+        });
+        st.a.b.c = 2;
+        st.a.b = { c: 3 } as any;
+        await Promise.resolve();
+        expect(batches).toBeGreaterThan(0);
     });
-    st.a.b.c = 2;
-    st.a.b = { c: 3 } as any;
-    await Promise.resolve();
-    expect(batches).toBeGreaterThan(0);
-  });
 
-  // multi-source value mode removed; patch-only now - skip equivalent
+    // multi-source value mode removed; patch-only now - skip equivalent
 
-  // getter source value mode removed in patch-only watcher
+    // getter source value mode removed in patch-only watcher
 
-  it("watch once option still stops after first batch", async () => {
-    const st = deepSignal({ a: 1 });
-    let count = 0;
-    watch(
-      st,
-      () => {
-        count++;
-      },
-      { once: true, immediate: true }
-    );
-    st.a = 2;
-    st.a = 3;
-    await Promise.resolve();
-    expect(count).toBe(1);
-  });
+    it("watch once option still stops after first batch", async () => {
+        const st = deepSignal({ a: 1 });
+        let count = 0;
+        watch(
+            st,
+            () => {
+                count++;
+            },
+            { once: true, immediate: true }
+        );
+        st.a = 2;
+        st.a = 3;
+        await Promise.resolve();
+        expect(count).toBe(1);
+    });
 
-  // observe value mode removed; observe is alias of watch
+    // observe value mode removed; observe is alias of watch
 });
 
 describe("patches & root ids", () => {
-  it("root ids are unique", () => {
-    const a = deepSignal({});
-    const b = deepSignal({});
-    expect(getDeepSignalRootId(a)).not.toBe(getDeepSignalRootId(b));
-  });
+    it("root ids are unique", () => {
+        const a = deepSignal({});
+        const b = deepSignal({});
+        expect(getDeepSignalRootId(a)).not.toBe(getDeepSignalRootId(b));
+    });
 
-  // legacy watchPatches API removed; patch mode only valid for deepSignal roots
-  it("watch throws on non-deepSignal input", () => {
-    expect(() => watch({} as any, () => {})).toThrow();
-  });
+    // legacy watchPatches API removed; patch mode only valid for deepSignal roots
+    it("watch throws on non-deepSignal input", () => {
+        expect(() => watch({} as any, () => {})).toThrow();
+    });
 
-  it("Map unsupported does not emit patches", async () => {
-    const m = new Map<string, number>();
-    const st = deepSignal({ m });
-    const patches: any[] = [];
-    const { stopListening: stop } = watch(st, ({ patches: batch }) =>
-      patches.push(batch)
-    );
-    m.set("a", 1);
-    await Promise.resolve();
-    await Promise.resolve();
-    expect(patches.length).toBe(0);
-    stop();
-  });
+    it("Map unsupported does not emit patches", async () => {
+        const m = new Map<string, number>();
+        const st = deepSignal({ m });
+        const patches: any[] = [];
+        const { stopListening: stop } = watch(st, ({ patches: batch }) =>
+            patches.push(batch)
+        );
+        m.set("a", 1);
+        await Promise.resolve();
+        await Promise.resolve();
+        expect(patches.length).toBe(0);
+        stop();
+    });
 });
 
 describe("tier3: Set iteration variants", () => {
-  it("entries() iteration proxies nested mutation", async () => {
-    const st = deepSignal({ s: new Set<any>() });
-    st.s.add({ id: "eEnt", inner: { v: 1 } });
-    const paths: string[] = [];
-    const { stopListening: stop } = watch(st, ({ patches }) =>
-      paths.push(...patches.map((pp: any) => pp.path.join(".")))
-    );
-    for (const [val] of st.s.entries()) {
-      (val as any).inner.v;
-    } // ensure proxy
-    for (const [val] of st.s.entries()) {
-      (val as any).inner.v = 2;
-    }
-    await Promise.resolve();
-    await Promise.resolve();
-    expect(paths.some((p) => p.endsWith("eEnt.inner.v"))).toBe(true);
-    stop();
-  });
+    it("entries() iteration proxies nested mutation", async () => {
+        const st = deepSignal({ s: new Set<any>() });
+        st.s.add({ id: "eEnt", inner: { v: 1 } });
+        const paths: string[] = [];
+        const { stopListening: stop } = watch(st, ({ patches }) =>
+            paths.push(...patches.map((pp: any) => pp.path.join(".")))
+        );
+        for (const [val] of st.s.entries()) {
+            (val as any).inner.v;
+        } // ensure proxy
+        for (const [val] of st.s.entries()) {
+            (val as any).inner.v = 2;
+        }
+        await Promise.resolve();
+        await Promise.resolve();
+        expect(paths.some((p) => p.endsWith("eEnt.inner.v"))).toBe(true);
+        stop();
+    });
 
-  it("forEach iteration proxies nested mutation", async () => {
-    const st = deepSignal({ s: new Set<any>() });
-    st.s.add({ id: "fe1", data: { n: 1 } });
-    const { stopListening: stop } = watch(st, () => {});
-    st.s.forEach((e) => (e as any).data.n); // access
-    st.s.forEach((e) => {
-      (e as any).data.n = 2;
+    it("forEach iteration proxies nested mutation", async () => {
+        const st = deepSignal({ s: new Set<any>() });
+        st.s.add({ id: "fe1", data: { n: 1 } });
+        const { stopListening: stop } = watch(st, () => {});
+        st.s.forEach((e) => (e as any).data.n); // access
+        st.s.forEach((e) => {
+            (e as any).data.n = 2;
+        });
+        await Promise.resolve();
+        await Promise.resolve();
+        stop();
     });
-    await Promise.resolve();
-    await Promise.resolve();
-    stop();
-  });
 
-  it("keys() iteration returns proxies", async () => {
-    const st = deepSignal({ s: new Set<any>() });
-    st.s.add({ id: "k1", foo: { x: 1 } });
-    const { stopListening: stop } = watch(st, () => {});
-    for (const e of st.s.keys()) {
-      (e as any).foo.x = 2;
-    }
-    await Promise.resolve();
-    await Promise.resolve();
-    stop();
-  });
+    it("keys() iteration returns proxies", async () => {
+        const st = deepSignal({ s: new Set<any>() });
+        st.s.add({ id: "k1", foo: { x: 1 } });
+        const { stopListening: stop } = watch(st, () => {});
+        for (const e of st.s.keys()) {
+            (e as any).foo.x = 2;
+        }
+        await Promise.resolve();
+        await Promise.resolve();
+        stop();
+    });
 });
 
 describe("tier3: peek behavior", () => {
-  it("peek does not create reactive dependency on property", async () => {
-    const st = deepSignal({ a: 1 });
-    let runs = 0;
-    effect(() => {
-      runs++;
-      peek(st, "a");
+    it("peek does not create reactive dependency on property", async () => {
+        const st = deepSignal({ a: 1 });
+        let runs = 0;
+        effect(() => {
+            runs++;
+            peek(st, "a");
+        });
+        expect(runs).toBe(1);
+        st.a = 2;
+        // Flush microtasks
+        await Promise.resolve();
+        await Promise.resolve();
+        expect(runs).toBe(1); // no rerun
     });
-    expect(runs).toBe(1);
-    st.a = 2;
-    // Flush microtasks
-    await Promise.resolve();
-    await Promise.resolve();
-    expect(runs).toBe(1); // no rerun
-  });
 });
 
 describe("tier3: traverse helper direct calls (symbols & sets)", () => {
-  it("traverse counts and respects depth param", () => {
-    __resetTraverseCount();
-    const obj: any = { a: { b: { c: 1 } } };
-    traverse(obj, 1);
-    const shallowCount = __traverseCount;
-    __resetTraverseCount();
-    traverse(obj, 3);
-    const deepCount = __traverseCount;
-    expect(deepCount).toBeGreaterThan(shallowCount);
-  });
+    it("traverse counts and respects depth param", () => {
+        __resetTraverseCount();
+        const obj: any = { a: { b: { c: 1 } } };
+        traverse(obj, 1);
+        const shallowCount = __traverseCount;
+        __resetTraverseCount();
+        traverse(obj, 3);
+        const deepCount = __traverseCount;
+        expect(deepCount).toBeGreaterThan(shallowCount);
+    });
 });

sdk/js/alien-deepsignals/src/test/watch.test.ts

@@ -4,88 +4,88 @@ import { watch } from "../watch";
 import { watchEffect } from "../watchEffect";
 
 describe("watch", () => {
-  it("watch immediate", () => {
-    const store = deepSignal({
-      userinfo: {
-        name: "tom",
-      },
+    it("watch immediate", () => {
+        const store = deepSignal({
+            userinfo: {
+                name: "tom",
+            },
+        });
+        let val!: string;
+        watch(
+            store,
+            ({ newValue }) => {
+                val = newValue.userinfo.name;
+            },
+            { immediate: true }
+        );
+        expect(val).toEqual("tom");
     });
-    let val!: string;
-    watch(
-      store,
-      ({ newValue }) => {
-        val = newValue.userinfo.name;
-      },
-      { immediate: true }
-    );
-    expect(val).toEqual("tom");
-  });
-  it("watch deep", () => {
-    const store = deepSignal({
-      userinfo: {
-        name: "tom",
-      },
+    it("watch deep", () => {
+        const store = deepSignal({
+            userinfo: {
+                name: "tom",
+            },
+        });
+        let val!: string;
+        watch(
+            store,
+            ({ newValue }) => {
+                val = newValue.userinfo.name;
+            },
+            { immediate: true }
+        );
+        let value2!: string;
+        watch(
+            store,
+            ({ newValue }) => {
+                value2 = newValue.userinfo.name;
+            },
+            { immediate: true }
+        );
+        expect(val).toEqual("tom");
+        store.userinfo.name = "jon";
+        // patch delivery async (microtask)
+        return Promise.resolve().then(() => {
+            expect(val).toEqual("jon");
+            // With refactored watch using native effect, shallow watcher now also updates root reference
+            expect(value2).toEqual("jon");
+        });
     });
-    let val!: string;
-    watch(
-      store,
-      ({ newValue }) => {
-        val = newValue.userinfo.name;
-      },
-      { immediate: true }
-    );
-    let value2!: string;
-    watch(
-      store,
-      ({ newValue }) => {
-        value2 = newValue.userinfo.name;
-      },
-      { immediate: true }
-    );
-    expect(val).toEqual("tom");
-    store.userinfo.name = "jon";
-    // patch delivery async (microtask)
-    return Promise.resolve().then(() => {
-      expect(val).toEqual("jon");
-      // With refactored watch using native effect, shallow watcher now also updates root reference
-      expect(value2).toEqual("jon");
-    });
-  });
 
-  it("watch once", () => {
-    const store = deepSignal({
-      userinfo: {
-        name: "tom",
-      },
+    it("watch once", () => {
+        const store = deepSignal({
+            userinfo: {
+                name: "tom",
+            },
+        });
+        let val!: string;
+        watch(
+            store,
+            ({ newValue }) => {
+                val = newValue.userinfo.name;
+            },
+            { immediate: true, once: true }
+        );
+
+        expect(val).toEqual("tom");
+        store.userinfo.name = "jon";
+        // once watcher shouldn't update after first run
+        expect(val).toEqual("tom");
     });
-    let val!: string;
-    watch(
-      store,
-      ({ newValue }) => {
-        val = newValue.userinfo.name;
-      },
-      { immediate: true, once: true }
-    );
 
-    expect(val).toEqual("tom");
-    store.userinfo.name = "jon";
-    // once watcher shouldn't update after first run
-    expect(val).toEqual("tom");
-  });
+    it("watch effect", () => {
+        const store = deepSignal({
+            userinfo: {
+                name: "tom",
+            },
+        });
+        let x = undefined;
+        watchEffect(() => {
+            x = store.userinfo.name;
+        });
 
-  it("watch effect", () => {
-    const store = deepSignal({
-      userinfo: {
-        name: "tom",
-      },
+        expect(x).toEqual("tom");
+        store.userinfo.name = "jon";
+        expect(x).toEqual("jon");
     });
-    let x = undefined;
-    watchEffect(() => {
-      x = store.userinfo.name;
-    });
-
-    expect(x).toEqual("tom");
-    store.userinfo.name = "jon";
-    expect(x).toEqual("jon");
-  });
 });

sdk/js/alien-deepsignals/src/watch.ts

@@ -1,10 +1,10 @@
 import { isObject, isPlainObject, isSet, isMap, isArray } from "./utils";
 import { isSignal } from "./core";
 import {
-  isDeepSignal,
-  subscribeDeepMutations,
-  getDeepSignalRootId,
-  DeepPatch,
+    isDeepSignal,
+    subscribeDeepMutations,
+    getDeepSignalRootId,
+    DeepPatch,
 } from "./deepSignal";
 import { ReactiveFlags } from "./contents";
 
@@ -15,125 +15,125 @@ export type WatchEffect = (registerCleanup: RegisterCleanup) => void;
 
 /** Options for {@link watch}. */
 export interface WatchOptions {
-  /** Trigger the callback immediately with the current value (default: false). */
-  immediate?: boolean;
-  /** Auto-stop the watcher after the first callback run that delivers patches (or immediate call if no patches). */
-  once?: boolean;
-  /** Allow legacy/unknown options (ignored) to avoid hard breaks while migrating. */
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  [legacy: string]: any;
+    /** Trigger the callback immediately with the current value (default: false). */
+    immediate?: boolean;
+    /** Auto-stop the watcher after the first callback run that delivers patches (or immediate call if no patches). */
+    once?: boolean;
+    /** Allow legacy/unknown options (ignored) to avoid hard breaks while migrating. */
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    [legacy: string]: any;
 }
 
 export interface WatchPatchEvent<Root = any> {
-  /** Patch batch that triggered this callback (may be empty for immediate). */
-  patches: DeepPatch[];
-  /** Previous snapshot (deep-cloned) of the root value before these patches. Undefined on first call. */
-  oldValue: Root | undefined;
-  /** Current root value (live proxy). */
-  newValue: Root;
+    /** Patch batch that triggered this callback (may be empty for immediate). */
+    patches: DeepPatch[];
+    /** Previous snapshot (deep-cloned) of the root value before these patches. Undefined on first call. */
+    oldValue: Root | undefined;
+    /** Current root value (live proxy). */
+    newValue: Root;
 }
 
 export type WatchPatchCallback<Root = any> = (
-  event: WatchPatchEvent<Root>
+    event: WatchPatchEvent<Root>
 ) => any;
 
 // Internal helper kept for external compatibility.
 export const remove = <T>(arr: T[], el: T): void => {
-  const i = arr.indexOf(el);
-  if (i > -1) arr.splice(i, 1);
+    const i = arr.indexOf(el);
+    if (i > -1) arr.splice(i, 1);
 };
 
 /** Observe patch batches on a deep signal root. */
 export function watch<Root = any>(
-  source: Root,
-  callback: WatchPatchCallback<Root>,
-  options: WatchOptions = {}
+    source: Root,
+    callback: WatchPatchCallback<Root>,
+    options: WatchOptions = {}
 ) {
-  if (!isDeepSignal(source)) {
-    throw new Error(
-      "watch() now only supports deepSignal roots (patch mode only)"
-    );
-  }
-  const { immediate, once } = options;
-
-  const rootId = getDeepSignalRootId(source as any)!;
-
-  let active = true;
-  let cleanup: (() => void) | undefined;
-  const registerCleanup: RegisterCleanup = (fn) => {
-    cleanup = fn;
-  };
-  const runCleanup = () => {
-    if (cleanup) {
-      try {
-        cleanup();
-      } catch {
-        /* ignore */
-      } finally {
-        cleanup = undefined;
-      }
+    if (!isDeepSignal(source)) {
+        throw new Error(
+            "watch() now only supports deepSignal roots (patch mode only)"
+        );
     }
-  };
-
-  // Deep clone snapshot helper (JSON clone sufficient for typical reactive plain data)
-  const clone = (v: any) => {
-    try {
-      return JSON.parse(JSON.stringify(v));
-    } catch {
-      return undefined as any;
-    }
-  };
-  let lastSnapshot: Root | undefined = clone(source);
-
-  const stopListening = () => {
-    if (!active) return;
-    active = false;
-    runCleanup();
-    unsubscribe && unsubscribe();
-  };
-
-  const deliver = (patches: DeepPatch[]) => {
-    if (!active) return;
-    runCleanup();
-    const prev = lastSnapshot;
-    const next = source as any as Root; // live proxy
-    try {
-      callback({
-        patches,
-        oldValue: prev,
-        newValue: next,
-      });
-    } finally {
-      if (active) lastSnapshot = clone(next);
-      if (once) stopListening();
+    const { immediate, once } = options;
+
+    const rootId = getDeepSignalRootId(source as any)!;
+
+    let active = true;
+    let cleanup: (() => void) | undefined;
+    const registerCleanup: RegisterCleanup = (fn) => {
+        cleanup = fn;
+    };
+    const runCleanup = () => {
+        if (cleanup) {
+            try {
+                cleanup();
+            } catch {
+                /* ignore */
+            } finally {
+                cleanup = undefined;
+            }
+        }
+    };
+
+    // Deep clone snapshot helper (JSON clone sufficient for typical reactive plain data)
+    const clone = (v: any) => {
+        try {
+            return JSON.parse(JSON.stringify(v));
+        } catch {
+            return undefined as any;
+        }
+    };
+    let lastSnapshot: Root | undefined = clone(source);
+
+    const stopListening = () => {
+        if (!active) return;
+        active = false;
+        runCleanup();
+        unsubscribe && unsubscribe();
+    };
+
+    const deliver = (patches: DeepPatch[]) => {
+        if (!active) return;
+        runCleanup();
+        const prev = lastSnapshot;
+        const next = source as any as Root; // live proxy
+        try {
+            callback({
+                patches,
+                oldValue: prev,
+                newValue: next,
+            });
+        } finally {
+            if (active) lastSnapshot = clone(next);
+            if (once) stopListening();
+        }
+    };
+
+    const unsubscribe = subscribeDeepMutations(rootId, (patches) => {
+        if (!patches.length) return; // ignore empty batches
+        deliver(patches);
+    });
+
+    if (immediate) {
+        // Immediate call with empty patch list (snapshot only)
+        deliver([]);
     }
-  };
-
-  const unsubscribe = subscribeDeepMutations(rootId, (patches) => {
-    if (!patches.length) return; // ignore empty batches
-    deliver(patches);
-  });
-
-  if (immediate) {
-    // Immediate call with empty patch list (snapshot only)
-    deliver([]);
-  }
-
-  return {
-    /** Stop listening to future patch batches; idempotent. */
-    stopListening,
-    /** Register a cleanup callback run before the next invocation / stop. */
-    registerCleanup,
-  };
+
+    return {
+        /** Stop listening to future patch batches; idempotent. */
+        stopListening,
+        /** Register a cleanup callback run before the next invocation / stop. */
+        registerCleanup,
+    };
 }
 
 // observe alias
 export function observe(
-  source: any,
-  cb: WatchPatchCallback,
-  options?: WatchOptions
+    source: any,
+    cb: WatchPatchCallback,
+    options?: WatchOptions
 ) {
-  return watch(source, cb, options);
+    return watch(source, cb, options);
 }
 
 // Instrumentation counter for performance tests (number of traverse invocations)
@@ -141,7 +141,7 @@ export function observe(
 export let __traverseCount = 0; // retained for external tooling/tests although watch no longer uses traversal
 /** Reset the traversal instrumentation counter back to 0. */
 export function __resetTraverseCount() {
-  __traverseCount = 0;
+    __traverseCount = 0;
 }
 
 /**
@@ -149,40 +149,40 @@ export function __resetTraverseCount() {
  * Depth-limited; protects against cycles via `seen` set; respects ReactiveFlags.SKIP opt-out.
  */
 export function traverse(
-  value: unknown,
-  depth: number = Infinity,
-  seen?: Set<unknown>
+    value: unknown,
+    depth: number = Infinity,
+    seen?: Set<unknown>
 ): unknown {
-  __traverseCount++;
-  if (depth <= 0 || !isObject(value) || (value as any)[ReactiveFlags.SKIP]) {
-    return value;
-  }
-
-  seen = seen || new Set();
-  if (seen.has(value)) {
-    return value;
-  }
-  seen.add(value);
-  depth--;
-  if (isSignal(value)) {
-    traverse((value as any)(), depth, seen);
-  } else if (isArray(value)) {
-    for (let i = 0; i < value.length; i++) {
-      traverse(value[i], depth, seen);
+    __traverseCount++;
+    if (depth <= 0 || !isObject(value) || (value as any)[ReactiveFlags.SKIP]) {
+        return value;
     }
-  } else if (isSet(value) || isMap(value)) {
-    value.forEach((v: any) => {
-      traverse(v, depth, seen);
-    });
-  } else if (isPlainObject(value)) {
-    for (const key in value) {
-      traverse(value[key], depth, seen);
+
+    seen = seen || new Set();
+    if (seen.has(value)) {
+        return value;
     }
-    for (const key of Object.getOwnPropertySymbols(value)) {
-      if (Object.prototype.propertyIsEnumerable.call(value, key)) {
-        traverse(value[key as any], depth, seen);
-      }
+    seen.add(value);
+    depth--;
+    if (isSignal(value)) {
+        traverse((value as any)(), depth, seen);
+    } else if (isArray(value)) {
+        for (let i = 0; i < value.length; i++) {
+            traverse(value[i], depth, seen);
+        }
+    } else if (isSet(value) || isMap(value)) {
+        value.forEach((v: any) => {
+            traverse(v, depth, seen);
+        });
+    } else if (isPlainObject(value)) {
+        for (const key in value) {
+            traverse(value[key], depth, seen);
+        }
+        for (const key of Object.getOwnPropertySymbols(value)) {
+            if (Object.prototype.propertyIsEnumerable.call(value, key)) {
+                traverse(value[key as any], depth, seen);
+            }
+        }
     }
-  }
-  return value;
+    return value;
 }