react-debug-updates - npm Package Compare versions

Comparing version 0.1.6 to 0.1.7

dist/fiber.d.ts

@@ -1,2 +0,2 @@
-import type { Fiber, PendingEntry } from "./types.js";
+import type { Fiber, DetectedRender } from "./types.js";
 export declare const FiberTag: {
@@ -13,2 +13,2 @@ readonly FunctionComponent: 0;
 export declare function getFiberPath(fiber: Fiber, maxDepth?: number): string;
-export declare function collectPending(root: Fiber, mode: "self-triggered" | "all", trackCauses: boolean): PendingEntry[];
+export declare function detectRenders(root: Fiber, mode: "self-triggered" | "all"): DetectedRender[];

dist/format.d.ts

@@ -1,2 +0,2 @@
-import type { UpdateCause } from "./types.js";
+import type { PendingEntry, UpdateCause } from "./types.js";
 export declare function formatValue(value: unknown, maxLength?: number): string;
@@ -7,1 +7,3 @@ /** Compact summary for overlay labels. */
 export declare function formatCausesConsole(causes: UpdateCause[]): string[];
+/** Log re-renders as a collapsed console group. */
+export declare function logRerendersToConsole(entries: PendingEntry[], showCauses: boolean): void;

dist/react-debug-updates.cjs

 "use strict";
 Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
-const STATE_HOOKS = /* @__PURE__ */ new Set([
-  "useState",
-  "useReducer",
-  "useSyncExternalStore"
-]);
-const HOOKS_WITHOUT_NODE = /* @__PURE__ */ new Set(["useContext"]);
-function detectCauses(fiber) {
-  const alternate = fiber.alternate;
-  if (!alternate) return [];
-  const causes = [];
-  if (fiber.memoizedProps !== alternate.memoizedProps) {
-    causes.push({ kind: "props" });
-  }
-  if (fiber.tag === FiberTag.ClassComponent) {
-    if (fiber.memoizedState !== alternate.memoizedState) {
-      causes.push({ kind: "class-state" });
-    }
-    return causes;
-  }
-  const hookTypes = fiber._debugHookTypes;
-  if (!hookTypes) {
-    if (fiber.memoizedState !== alternate.memoizedState) {
-      causes.push({ kind: "unknown" });
-    }
-    return causes;
-  }
-  let currentNode = fiber.memoizedState;
-  let previousNode = alternate.memoizedState;
-  let hasContextHook = false;
-  let anyStateHookChanged = false;
-  for (let i = 0; i < hookTypes.length; i++) {
-    const type = hookTypes[i];
-    if (HOOKS_WITHOUT_NODE.has(type)) {
-      if (type === "useContext") hasContextHook = true;
-      continue;
-    }
-    if (STATE_HOOKS.has(type) && currentNode && previousNode) {
-      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {
-        anyStateHookChanged = true;
-        causes.push({
-          kind: "hook",
-          hookIndex: i,
-          hookType: type,
-          previousValue: previousNode.memoizedState,
-          nextValue: currentNode.memoizedState
-        });
-      }
-    }
-    currentNode = (currentNode == null ? void 0 : currentNode.next) ?? null;
-    previousNode = (previousNode == null ? void 0 : previousNode.next) ?? null;
-  }
-  if (hasContextHook && !anyStateHookChanged && fiber.memoizedProps === alternate.memoizedProps) {
-    causes.push({ kind: "hook", hookType: "useContext" });
-  }
-  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {
-    causes.push({ kind: "unknown" });
-  }
-  return causes;
-}
 const FiberTag = {
@@ -116,21 +57,11 @@ FunctionComponent: 0,
 }
-function collectPending(root, mode, trackCauses) {
-  const entries = [];
+function detectRenders(root, mode) {
+  const results = [];
   const selfTriggeredOnly = mode === "self-triggered";
   const previousRoot = root.alternate;
-  if (!previousRoot) return entries;
+  if (!previousRoot) return results;
   function walk(nextFiber, previousFiber, depth) {
     if (COMPONENT_TAGS.has(nextFiber.tag) && previousFiber !== null && previousFiber !== nextFiber && // same object → bailed-out subtree
     didFiberRender(nextFiber) && (!selfTriggeredOnly || isSelfTriggered(nextFiber))) {
-      const name = getComponentName(nextFiber);
-      if (name) {
-        entries.push({
-          component: name,
-          path: getFiberPath(nextFiber),
-          duration: nextFiber.actualDuration ?? 0,
-          depth,
-          domNode: findNearestDOMNode(nextFiber),
-          causes: trackCauses ? detectCauses(nextFiber) : []
-        });
-      }
+      results.push({ fiber: nextFiber, depth });
     }
@@ -152,4 +83,63 @@ let nextChild = nextFiber.child;
   walk(root, previousRoot, 0);
-  return entries;
+  return results;
 }
+const STATE_HOOKS = /* @__PURE__ */ new Set([
+  "useState",
+  "useReducer",
+  "useSyncExternalStore"
+]);
+const HOOKS_WITHOUT_NODE = /* @__PURE__ */ new Set(["useContext"]);
+function detectCauses(fiber) {
+  const alternate = fiber.alternate;
+  if (!alternate) return [];
+  const causes = [];
+  if (fiber.memoizedProps !== alternate.memoizedProps) {
+    causes.push({ kind: "props" });
+  }
+  if (fiber.tag === FiberTag.ClassComponent) {
+    if (fiber.memoizedState !== alternate.memoizedState) {
+      causes.push({ kind: "class-state" });
+    }
+    return causes;
+  }
+  const hookTypes = fiber._debugHookTypes;
+  if (!hookTypes) {
+    if (fiber.memoizedState !== alternate.memoizedState) {
+      causes.push({ kind: "unknown" });
+    }
+    return causes;
+  }
+  let currentNode = fiber.memoizedState;
+  let previousNode = alternate.memoizedState;
+  let hasContextHook = false;
+  let anyStateHookChanged = false;
+  for (let i = 0; i < hookTypes.length; i++) {
+    const type = hookTypes[i];
+    if (HOOKS_WITHOUT_NODE.has(type)) {
+      if (type === "useContext") hasContextHook = true;
+      continue;
+    }
+    if (STATE_HOOKS.has(type) && currentNode && previousNode) {
+      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {
+        anyStateHookChanged = true;
+        causes.push({
+          kind: "hook",
+          hookIndex: i,
+          hookType: type,
+          previousValue: previousNode.memoizedState,
+          nextValue: currentNode.memoizedState
+        });
+      }
+    }
+    currentNode = (currentNode == null ? void 0 : currentNode.next) ?? null;
+    previousNode = (previousNode == null ? void 0 : previousNode.next) ?? null;
+  }
+  if (hasContextHook && !anyStateHookChanged && fiber.memoizedProps === alternate.memoizedProps) {
+    causes.push({ kind: "hook", hookType: "useContext" });
+  }
+  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {
+    causes.push({ kind: "unknown" });
+  }
+  return causes;
+}
 function formatValue(value, maxLength = 50) {
@@ -217,2 +207,25 @@ var _a;
 }
+function logRerendersToConsole(entries, showCauses) {
+  if (entries.length === 0) return;
+  console.groupCollapsed(
+    `%c⚛ ${entries.length} re-render${entries.length > 1 ? "s" : ""}`,
+    "color: #61dafb; font-weight: bold"
+  );
+  for (let i = 0; i < entries.length; i++) {
+    const entry = entries[i];
+    const durationText = entry.duration > 0 ? ` (${entry.duration.toFixed(2)}ms)` : "";
+    console.log(
+      `%c${entry.component}%c ${entry.path}${durationText}`,
+      "color: #e8e82e; font-weight: bold",
+      "color: #888"
+    );
+    if (showCauses && entry.causes.length > 0) {
+      const lines = formatCausesConsole(entry.causes);
+      for (const line of lines) {
+        console.log(`%c${line}`, "color: #aaa");
+      }
+    }
+  }
+  console.groupEnd();
+}
 const ANIMATION_NAME = "__rdu-fade";
@@ -429,6 +442,18 @@ const injectedWindows = /* @__PURE__ */ new WeakSet();
     previousOnCommit(rendererID, root, priorityLevel);
-    const pendingEntries = collectPending(root.current, mode, showCauses);
-    for (let i = 0; i < pendingEntries.length; i++) {
-      const pendingEntry = pendingEntries[i];
-      const entry = {
+    const detectedRenders = detectRenders(root.current, mode);
+    if (detectedRenders.length === 0) return;
+    const pendingEntries = [];
+    for (let i = 0; i < detectedRenders.length; i++) {
+      const { fiber, depth } = detectedRenders[i];
+      const name = getComponentName(fiber);
+      if (!name) continue;
+      const pendingEntry = {
+        component: name,
+        path: getFiberPath(fiber),
+        duration: fiber.actualDuration ?? 0,
+        depth,
+        domNode: findNearestDOMNode(fiber),
+        causes: showCauses ? detectCauses(fiber) : []
+      };
+      const renderEntry = {
         component: pendingEntry.component,
@@ -440,28 +465,10 @@ path: pendingEntry.path,
       };
-      if (filter && !filter(entry)) continue;
+      if (filter && !filter(renderEntry)) continue;
       if (entries.length >= bufferSize) entries.shift();
-      entries.push(entry);
+      entries.push(renderEntry);
+      pendingEntries.push(pendingEntry);
       batcher == null ? void 0 : batcher.push(pendingEntry);
     }
-    if (!silent && pendingEntries.length > 0) {
-      console.groupCollapsed(
-        `%c⚛ ${pendingEntries.length} re-render${pendingEntries.length > 1 ? "s" : ""}`,
-        "color: #61dafb; font-weight: bold"
-      );
-      for (let i = 0; i < pendingEntries.length; i++) {
-        const pendingEntry = pendingEntries[i];
-        const durationText = pendingEntry.duration > 0 ? ` (${pendingEntry.duration.toFixed(2)}ms)` : "";
-        console.log(
-          `%c${pendingEntry.component}%c ${pendingEntry.path}${durationText}`,
-          "color: #e8e82e; font-weight: bold",
-          "color: #888"
-        );
-        if (showCauses && pendingEntry.causes.length > 0) {
-          const lines = formatCausesConsole(pendingEntry.causes);
-          for (const line of lines) {
-            console.log(`%c${line}`, "color: #aaa");
-          }
-        }
-      }
-      console.groupEnd();
+    if (!silent) {
+      logRerendersToConsole(pendingEntries, showCauses);
     }
@@ -468,0 +475,0 @@ };

dist/react-debug-updates.cjs.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"react-debug-updates.cjs","sources":["../src/causes.ts","../src/fiber.ts","../src/format.ts","../src/overlay.ts","../src/batcher.ts","../src/logger.ts"],"sourcesContent":["import type { Fiber, HookNode, UpdateCause } from \"./types.js\";\nimport { FiberTag } from \"./fiber.js\";\n\n// ────────────────────────────────────────────\n// Update cause detection\n// ────────────────────────────────────────────\n//\n// For function components, React stores hooks as a linked list on\n// fiber.memoizedState. In dev builds, _debugHookTypes lists hook names\n// in call order. We walk both in parallel, comparing memoizedState\n// on each node to find which hook's state actually changed.\n//\n// Caveat: useContext does NOT create a linked list node, so we skip it\n// when advancing the pointer, and detect it by elimination.\n\n/**\n * Hooks whose memoizedState changing can trigger a re-render.\n * We only report these — useEffect/useMemo/etc. don't cause re-renders.\n */\nconst STATE_HOOKS = new Set([\n  \"useState\",\n  \"useReducer\",\n  \"useSyncExternalStore\",\n]);\n\n/**\n * Hooks that do NOT create a node in the memoizedState linked list.\n * Currently only useContext — every other hook allocates a node.\n */\nconst HOOKS_WITHOUT_NODE = new Set([\"useContext\"]);\n\nexport function detectCauses(fiber: Fiber): UpdateCause[] {\n  const alternate = fiber.alternate;\n  if (!alternate) return [];\n\n  const causes: UpdateCause[] = [];\n\n  // ── Props changed (parent re-rendered us with new props) ──\n  if (fiber.memoizedProps !== alternate.memoizedProps) {\n    causes.push({ kind: \"props\" });\n  }\n\n  // ── Class component ──\n  if (fiber.tag === FiberTag.ClassComponent) {\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"class-state\" });\n    }\n    return causes;\n  }\n\n  // ── Function component hooks ──\n  const hookTypes = fiber._debugHookTypes;\n\n  if (!hookTypes) {\n    // No debug info (prod build) — best effort\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"unknown\" });\n    }\n    return causes;\n  }\n\n  let currentNode = fiber.memoizedState as HookNode | null;\n  let previousNode = alternate.memoizedState as HookNode | null;\n  let hasContextHook = false;\n  let anyStateHookChanged = false;\n\n  for (let i = 0; i < hookTypes.length; i++) {\n    const type = hookTypes[i];\n\n    // useContext has no linked list node — skip pointer advance\n    if (HOOKS_WITHOUT_NODE.has(type)) {\n      if (type === \"useContext\") hasContextHook = true;\n      continue;\n    }\n\n    if (STATE_HOOKS.has(type) && currentNode && previousNode) {\n      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {\n        anyStateHookChanged = true;\n        causes.push({\n          kind: \"hook\",\n          hookIndex: i,\n          hookType: type,\n          previousValue: previousNode.memoizedState,\n          nextValue: currentNode.memoizedState,\n        });\n      }\n    }\n\n    currentNode = currentNode?.next ?? null;\n    previousNode = previousNode?.next ?? null;\n  }\n\n  // If no state hook changed but component is self-triggered and has\n  // useContext → the context value must have changed.\n  if (\n    hasContextHook &&\n    !anyStateHookChanged &&\n    fiber.memoizedProps === alternate.memoizedProps\n  ) {\n    causes.push({ kind: \"hook\", hookType: \"useContext\" });\n  }\n\n  // If still nothing and self-triggered, mark unknown\n  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {\n    causes.push({ kind: \"unknown\" });\n  }\n\n  return causes;\n}\n","import type { Fiber, PendingEntry } from \"./types.js\";\nimport { detectCauses } from \"./causes.js\";\n\n// ────────────────────────────────────────────\n// Fiber tag constants\n// ────────────────────────────────────────────\n\nexport const FiberTag = {\n  FunctionComponent: 0,\n  ClassComponent: 1,\n  HostComponent: 5,\n  ForwardRef: 11,\n  SimpleMemoComponent: 15,\n  MemoComponent: 14,\n} as const;\n\n// Component tags we report as re-renders.\n// MemoComponent (14) is excluded to avoid double-reporting — it's a wrapper\n// fiber around the inner component. The inner component (FunctionComponent,\n// ForwardRef, or SimpleMemoComponent) has its own PerformedWork flag and\n// will be reported correctly on its own.\nconst COMPONENT_TAGS = new Set<number>([\n  FiberTag.FunctionComponent,\n  FiberTag.ClassComponent,\n  FiberTag.ForwardRef,\n  FiberTag.SimpleMemoComponent,\n]);\n\nconst PerformedWork = 0b0000001;\n\n// ────────────────────────────────────────────\n// Fiber tree helpers\n// ────────────────────────────────────────────\n\nexport function getComponentName(fiber: Fiber): string | null {\n  const { type } = fiber;\n  if (!type || typeof type === \"string\") return null;\n  return type.displayName ?? type.name ?? null;\n}\n\nfunction isHTMLElement(value: unknown): value is HTMLElement {\n  return (\n    typeof value === \"object\" &&\n    value !== null &&\n    (value as Node).nodeType === 1 &&\n    typeof (value as HTMLElement).getBoundingClientRect === \"function\"\n  );\n}\n\nexport function findNearestDOMNode(fiber: Fiber): HTMLElement | null {\n  if (fiber.tag === FiberTag.HostComponent && isHTMLElement(fiber.stateNode)) {\n    return fiber.stateNode;\n  }\n  let child: Fiber | null = fiber.child;\n  while (child) {\n    const found = findNearestDOMNode(child);\n    if (found) return found;\n    child = child.sibling;\n  }\n  return null;\n}\n\nexport function getFiberPath(fiber: Fiber, maxDepth = 5): string {\n  const parts: string[] = [];\n  let current: Fiber | null = fiber.return;\n  let depth = 0;\n  while (current && depth < maxDepth) {\n    const name = getComponentName(current);\n    if (name) parts.unshift(name);\n    current = current.return;\n    depth++;\n  }\n  return parts.length ? parts.join(\" → \") : \"(root)\";\n}\n\n// ────────────────────────────────────────────\n// Self-triggered detection\n// ────────────────────────────────────────────\n\nfunction isSelfTriggered(fiber: Fiber): boolean {\n  const alternate = fiber.alternate;\n  if (!alternate) return false;\n  return fiber.memoizedProps === alternate.memoizedProps;\n}\n\n// ────────────────────────────────────────────\n// didFiberRender — mirrors React DevTools\n// ────────────────────────────────────────────\n//\n// See: react-devtools-shared/src/backend/fiber/shared/DevToolsFiberChangeDetection.js\n//\n// For component fibers (function, class, memo, forwardRef), React sets the\n// PerformedWork flag (bit 0) only when user code actually executes.\n// createWorkInProgress resets flags to NoFlags, so PerformedWork on a\n// work-in-progress fiber is always fresh — never stale from a prior commit.\n//\n// This check must only be called AFTER confirming prevFiber !== nextFiber\n// (i.e. the fiber was actually processed, not a bailed-out subtree).\n\nfunction didFiberRender(nextFiber: Fiber): boolean {\n  return (nextFiber.flags & PerformedWork) === PerformedWork;\n}\n\n// ────────────────────────────────────────────\n// Collect re-rendered components from a commit\n// ────────────────────────────────────────────\n//\n// Mirrors React DevTools' updateFiberRecursively / updateChildrenRecursively.\n//\n// React double-buffers fibers. After a commit, root.current is the committed\n// tree and root.current.alternate is the previous tree. We walk both in\n// parallel. At each level, if prevChild and nextChild are the same object,\n// React bailed out that entire subtree (via cloneChildFibers) — we skip it.\n// Otherwise, we use nextChild.alternate as the previous fiber and check\n// didFiberRender (PerformedWork) to see if user code actually ran.\n\nexport function collectPending(\n  root: Fiber,\n  mode: \"self-triggered\" | \"all\",\n  trackCauses: boolean,\n): PendingEntry[] {\n  const entries: PendingEntry[] = [];\n  const selfTriggeredOnly = mode === \"self-triggered\";\n\n  // The alternate of the committed root is the previous tree's root.\n  // On initial mount this is null — nothing to report.\n  const previousRoot = root.alternate;\n  if (!previousRoot) return entries;\n\n  function walk(\n    nextFiber: Fiber,\n    previousFiber: Fiber | null,\n    depth: number,\n  ) {\n    // ── Check this fiber ──\n    if (\n      COMPONENT_TAGS.has(nextFiber.tag) &&\n      previousFiber !== null &&\n      previousFiber !== nextFiber && // same object → bailed-out subtree\n      didFiberRender(nextFiber) &&\n      (!selfTriggeredOnly || isSelfTriggered(nextFiber))\n    ) {\n      const name = getComponentName(nextFiber);\n      if (name) {\n        entries.push({\n          component: name,\n          path: getFiberPath(nextFiber),\n          duration: nextFiber.actualDuration ?? 0,\n          depth,\n          domNode: findNearestDOMNode(nextFiber),\n          causes: trackCauses ? detectCauses(nextFiber) : [],\n        });\n      }\n    }\n\n    // ── Walk children, matching with previous tree ──\n    let nextChild = nextFiber.child;\n    let previousChildAtSameIndex = previousFiber?.child ?? null;\n\n    while (nextChild) {\n      let matchedPrevious: Fiber | null;\n\n      if (previousChildAtSameIndex === nextChild) {\n        // Same object identity — React shared this fiber via cloneChildFibers.\n        // The entire subtree was bailed out; passing the same object as both\n        // prev and next causes the prevFiber !== nextFiber guard to skip it.\n        matchedPrevious = nextChild;\n      } else {\n        // Different object — this fiber was processed. The alternate is the\n        // corresponding fiber from the previous tree.\n        matchedPrevious = nextChild.alternate;\n      }\n\n      walk(nextChild, matchedPrevious, depth + 1);\n\n      nextChild = nextChild.sibling;\n      previousChildAtSameIndex = previousChildAtSameIndex?.sibling ?? null;\n    }\n  }\n\n  walk(root, previousRoot, 0);\n  return entries;\n}\n","import type { UpdateCause } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Value formatting\n// ────────────────────────────────────────────\n\nexport function formatValue(value: unknown, maxLength = 50): string {\n  if (value === null) return \"null\";\n  if (value === undefined) return \"undefined\";\n  if (typeof value === \"boolean\") return String(value);\n  if (typeof value === \"number\") return String(value);\n  if (typeof value === \"function\")\n    return `ƒ ${(value as { name?: string }).name || \"anonymous\"}`;\n\n  if (typeof value === \"string\") {\n    const truncated =\n      value.length > maxLength ? value.slice(0, maxLength) + \"…\" : value;\n    return JSON.stringify(truncated);\n  }\n\n  if (Array.isArray(value)) return `Array(${value.length})`;\n\n  if (typeof value === \"object\") {\n    const name = (value as object).constructor?.name;\n    if (name && name !== \"Object\") return name;\n    const keys = Object.keys(value as object);\n    if (keys.length <= 3) return `{ ${keys.join(\", \")} }`;\n    return `{ ${keys.slice(0, 3).join(\", \")}, … }`;\n  }\n\n  return String(value);\n}\n\n// ────────────────────────────────────────────\n// Cause formatting\n// ────────────────────────────────────────────\n\n/** Compact summary for overlay labels. */\nexport function formatCausesShort(causes: UpdateCause[]): string {\n  if (causes.length === 0) return \"\";\n\n  const parts: string[] = [];\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      parts.push(\"props\");\n    } else if (cause.kind === \"class-state\") {\n      parts.push(\"state\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix = cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      parts.push(`${cause.hookType}${indexSuffix}`);\n    } else {\n      parts.push(\"?\");\n    }\n  }\n\n  return parts.join(\", \");\n}\n\n/** Detailed lines for console output. */\nexport function formatCausesConsole(causes: UpdateCause[]): string[] {\n  const lines: string[] = [];\n\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      lines.push(\"  ↳ props changed (parent re-rendered)\");\n    } else if (cause.kind === \"class-state\") {\n      lines.push(\"  ↳ class state changed\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix =\n        cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      const name = `${cause.hookType}${indexSuffix}`;\n\n      if (cause.previousValue !== undefined && cause.nextValue !== undefined) {\n        lines.push(\n          `  ↳ ${name}: ${formatValue(cause.previousValue)} → ${formatValue(cause.nextValue)}`,\n        );\n      } else {\n        lines.push(`  ↳ ${name} changed`);\n      }\n    } else {\n      lines.push(\"  ↳ unknown cause\");\n    }\n  }\n\n  return lines;\n}\n","// ────────────────────────────────────────────\n// Per-window overlay infrastructure\n// ────────────────────────────────────────────\n//\n// Performance:\n//  - Overlay elements pooled per window, reused via animationend\n//  - Single CSS @keyframes per window, no JS timers per element\n\nconst ANIMATION_NAME = \"__rdu-fade\";\n\nconst injectedWindows = new WeakSet<Window>();\n\nfunction ensureStylesheet(win: Window) {\n  if (injectedWindows.has(win)) return;\n  injectedWindows.add(win);\n\n  const style = win.document.createElement(\"style\");\n  style.textContent = `\n    @keyframes ${ANIMATION_NAME} {\n      0%   { opacity: 0; }\n      8%   { opacity: var(--rdu-opacity, 1); }\n      40%  { opacity: var(--rdu-opacity, 1); }\n      100% { opacity: 0; }\n    }\n    .${ANIMATION_NAME}-box {\n      position: fixed;\n      pointer-events: none;\n      box-sizing: border-box;\n      border-radius: 3px;\n      opacity: 0;\n      will-change: opacity;\n    }\n    .${ANIMATION_NAME}-label {\n      position: absolute;\n      top: -18px;\n      left: -1px;\n      font: 10px/16px ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, monospace;\n      padding: 0 4px;\n      color: #fff;\n      border-radius: 2px 2px 0 0;\n      white-space: nowrap;\n      pointer-events: none;\n    }\n  `;\n  win.document.head.appendChild(style);\n}\n\n// ────────────────────────────────────────────\n// Overlay root container\n// ────────────────────────────────────────────\n\nconst overlayRoots = new WeakMap<Window, HTMLDivElement>();\n\nfunction getOverlayRoot(win: Window): HTMLDivElement | null {\n  if (win.closed) return null;\n\n  const existing = overlayRoots.get(win);\n  if (existing?.isConnected) return existing;\n\n  ensureStylesheet(win);\n\n  const root = win.document.createElement(\"div\");\n  root.id = \"__react-debug-updates\";\n  Object.assign(root.style, {\n    position: \"fixed\",\n    top: \"0\",\n    left: \"0\",\n    width: \"0\",\n    height: \"0\",\n    overflow: \"visible\",\n    pointerEvents: \"none\",\n    zIndex: \"2147483647\",\n  } satisfies Partial<CSSStyleDeclaration>);\n  win.document.body.appendChild(root);\n\n  overlayRoots.set(win, root);\n  return root;\n}\n\n// ────────────────────────────────────────────\n// Element pool\n// ────────────────────────────────────────────\n\nconst pools = new WeakMap<Window, HTMLDivElement[]>();\n\nexport function acquireOverlay(win: Window): HTMLDivElement | null {\n  const root = getOverlayRoot(win);\n  if (!root) return null;\n\n  let pool = pools.get(win);\n  if (!pool) {\n    pool = [];\n    pools.set(win, pool);\n  }\n\n  const document = win.document;\n  let element = pool.pop();\n\n  if (!element) {\n    element = document.createElement(\"div\");\n    element.className = `${ANIMATION_NAME}-box`;\n\n    const label = document.createElement(\"span\");\n    label.className = `${ANIMATION_NAME}-label`;\n    element.appendChild(label);\n\n    element.addEventListener(\"animationend\", () => {\n      element!.style.animation = \"none\";\n      element!.remove();\n      pool!.push(element!);\n    });\n  }\n\n  root.appendChild(element);\n  return element;\n}\n\nexport function disposeAllOverlays() {\n  const mainRoot = overlayRoots.get(window);\n  mainRoot?.remove();\n  overlayRoots.delete(window);\n  pools.delete(window);\n}\n\nexport const OVERLAY_ANIMATION_NAME = ANIMATION_NAME;\n","import type { HighlightOptions, PendingEntry } from \"./types.js\";\nimport { formatCausesShort } from \"./format.js\";\nimport { acquireOverlay, OVERLAY_ANIMATION_NAME } from \"./overlay.js\";\n\n// ────────────────────────────────────────────\n// Heat color\n// ────────────────────────────────────────────\n\nfunction heatColor(count: number, alpha: number): string {\n  const normalizedCount = Math.min((count - 1) / 7, 1);\n  const hue = 200 - normalizedCount * 200;\n  const saturation = 85 + normalizedCount * 15;\n  const lightness = 55 - normalizedCount * 10;\n  return `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`;\n}\n\n// ────────────────────────────────────────────\n// Batched flush\n// ────────────────────────────────────────────\n//\n// Commit path just pushes lightweight refs (no DOM reads, no formatting).\n// Flush (setInterval): batched rect reads → batched DOM writes.\n\nexport const HIGHLIGHT_DEFAULTS: Required<HighlightOptions> = {\n  flushInterval: 250,\n  animationDuration: 1200,\n  showLabels: true,\n  opacity: 0.3,\n};\n\ninterface CoalescedEntry {\n  count: number;\n  totalDuration: number;\n  component: string;\n  /** Shallowest fiber depth among coalesced entries (for z-ordering). */\n  depth: number;\n  domNode: HTMLElement;\n  ownerWindow: Window;\n  causeSummary: string;\n}\n\nexport function createBatcher(options: Required<HighlightOptions>) {\n  let pending: PendingEntry[] = [];\n  let timer: ReturnType<typeof setInterval> | null = null;\n\n  function flush() {\n    if (pending.length === 0) return;\n\n    const batch = pending;\n    pending = [];\n\n    // Coalesce by DOM node identity\n    const map = new Map<HTMLElement, CoalescedEntry>();\n\n    for (let i = 0; i < batch.length; i++) {\n      const entry = batch[i];\n      if (!entry.domNode) continue;\n\n      const existing = map.get(entry.domNode);\n      if (existing) {\n        existing.count++;\n        existing.totalDuration += entry.duration;\n        existing.depth = Math.min(existing.depth, entry.depth);\n      } else {\n        const win = entry.domNode.ownerDocument?.defaultView;\n        if (!win || win.closed) continue;\n        map.set(entry.domNode, {\n          count: 1,\n          totalDuration: entry.duration,\n          component: entry.component,\n          depth: entry.depth,\n          domNode: entry.domNode,\n          ownerWindow: win,\n          causeSummary: formatCausesShort(entry.causes),\n        });\n      }\n    }\n\n    // Read phase: batch all rect reads\n    const toShow: Array<{ coalesced: CoalescedEntry; rect: DOMRect }> = [];\n    for (const coalesced of map.values()) {\n      const rect = coalesced.domNode.getBoundingClientRect();\n      if (rect.width > 0 || rect.height > 0) {\n        toShow.push({ coalesced, rect });\n      }\n    }\n\n    // Sort deepest first so parents are appended last (render on top)\n    toShow.sort((a, b) => b.coalesced.depth - a.coalesced.depth);\n\n    // Write phase: position overlays\n    for (let i = 0; i < toShow.length; i++) {\n      const { coalesced, rect } = toShow[i];\n      const element = acquireOverlay(coalesced.ownerWindow);\n      if (!element) continue;\n\n      const fillColor = heatColor(coalesced.count, 0.18);\n      const borderColor = heatColor(coalesced.count, 0.75);\n      const labelBackground = heatColor(coalesced.count, 0.9);\n\n      const style = element.style;\n      style.top = `${rect.top}px`;\n      style.left = `${rect.left}px`;\n      style.width = `${rect.width}px`;\n      style.height = `${rect.height}px`;\n      style.backgroundColor = fillColor;\n      style.border = `1.5px solid ${borderColor}`;\n      style.setProperty(\"--rdu-opacity\", String(options.opacity));\n      style.animation = `${OVERLAY_ANIMATION_NAME} ${options.animationDuration}ms ease-out forwards`;\n\n      const label = element.firstElementChild as HTMLElement;\n      if (options.showLabels) {\n        const countText = coalesced.count > 1 ? ` ×${coalesced.count}` : \"\";\n        const durationText =\n          coalesced.totalDuration > 0\n            ? ` ${coalesced.totalDuration.toFixed(1)}ms`\n            : \"\";\n        const causeText = coalesced.causeSummary\n          ? ` (${coalesced.causeSummary})`\n          : \"\";\n        label.textContent = `${coalesced.component}${countText}${durationText}${causeText}`;\n        label.style.backgroundColor = labelBackground;\n      } else {\n        label.textContent = \"\";\n        label.style.backgroundColor = \"transparent\";\n      }\n    }\n  }\n\n  function push(entry: PendingEntry) {\n    pending.push(entry);\n    if (!timer) {\n      timer = setInterval(flush, options.flushInterval);\n    }\n  }\n\n  function dispose() {\n    if (timer) {\n      clearInterval(timer);\n      timer = null;\n    }\n    pending = [];\n  }\n\n  return { push, dispose };\n}\n","import type {\n  DevToolsHook,\n  FiberRoot,\n  LoggerOptions,\n  RenderEntry,\n  RenderLogger,\n} from \"./types.js\";\nimport { collectPending } from \"./fiber.js\";\nimport { formatCausesConsole } from \"./format.js\";\nimport { HIGHLIGHT_DEFAULTS, createBatcher } from \"./batcher.js\";\nimport { disposeAllOverlays } from \"./overlay.js\";\n\n/**\n * Attach a render logger to React's DevTools hook.\n *\n * Hooks into `__REACT_DEVTOOLS_GLOBAL_HOOK__.onCommitFiberRoot` to intercept\n * every React commit. Records re-render entries, optionally logs them to the\n * console, and optionally shows visual highlight overlays on re-rendered DOM nodes.\n *\n * Returns a `RenderLogger` handle, or `null` if the DevTools hook is not found.\n */\nexport function attachRenderLogger(\n  options: LoggerOptions = {},\n): RenderLogger | null {\n  const {\n    silent = false,\n    bufferSize = 500,\n    filter,\n    highlight = false,\n    mode = \"self-triggered\",\n    showCauses = false,\n  } = options;\n\n  const hook = (\n    window as unknown as { __REACT_DEVTOOLS_GLOBAL_HOOK__?: DevToolsHook }\n  ).__REACT_DEVTOOLS_GLOBAL_HOOK__;\n\n  if (!hook) {\n    console.warn(\n      \"[react-debug-updates] __REACT_DEVTOOLS_GLOBAL_HOOK__ not found. \" +\n        \"Make sure React DevTools or a dev build of React is active.\",\n    );\n    return null;\n  }\n\n  const highlightOptions = highlight\n    ? {\n        ...HIGHLIGHT_DEFAULTS,\n        ...(typeof highlight === \"object\" ? highlight : {}),\n      }\n    : null;\n\n  const batcher = highlightOptions ? createBatcher(highlightOptions) : null;\n\n  const entries: RenderEntry[] = [];\n  const previousOnCommit = hook.onCommitFiberRoot.bind(hook);\n\n  hook.onCommitFiberRoot = (\n    rendererID: number,\n    root: FiberRoot,\n    priorityLevel?: unknown,\n  ) => {\n    previousOnCommit(rendererID, root, priorityLevel);\n\n    const pendingEntries = collectPending(root.current, mode, showCauses);\n\n    for (let i = 0; i < pendingEntries.length; i++) {\n      const pendingEntry = pendingEntries[i];\n\n      const entry: RenderEntry = {\n        component: pendingEntry.component,\n        path: pendingEntry.path,\n        duration: pendingEntry.duration,\n        timestamp: performance.now(),\n        causes: pendingEntry.causes,\n      };\n\n      if (filter && !filter(entry)) continue;\n\n      if (entries.length >= bufferSize) entries.shift();\n      entries.push(entry);\n\n      batcher?.push(pendingEntry);\n    }\n\n    // Console output\n    if (!silent && pendingEntries.length > 0) {\n      console.groupCollapsed(\n        `%c⚛ ${pendingEntries.length} re-render${pendingEntries.length > 1 ? \"s\" : \"\"}`,\n        \"color: #61dafb; font-weight: bold\",\n      );\n\n      for (let i = 0; i < pendingEntries.length; i++) {\n        const pendingEntry = pendingEntries[i];\n        const durationText =\n          pendingEntry.duration > 0\n            ? ` (${pendingEntry.duration.toFixed(2)}ms)`\n            : \"\";\n        console.log(\n          `%c${pendingEntry.component}%c ${pendingEntry.path}${durationText}`,\n          \"color: #e8e82e; font-weight: bold\",\n          \"color: #888\",\n        );\n\n        if (showCauses && pendingEntry.causes.length > 0) {\n          const lines = formatCausesConsole(pendingEntry.causes);\n          for (const line of lines) {\n            console.log(`%c${line}`, \"color: #aaa\");\n          }\n        }\n      }\n\n      console.groupEnd();\n    }\n  };\n\n  const disconnect = () => {\n    hook.onCommitFiberRoot = previousOnCommit;\n    batcher?.dispose();\n    disposeAllOverlays();\n  };\n\n  if (!silent) {\n    console.log(\n      \"%c⚛ react-debug-updates attached\",\n      \"color: #61dafb; font-weight: bold\",\n    );\n  }\n\n  return { entries, disconnect 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+{"version":3,"file":"react-debug-updates.cjs","sources":["../src/fiber.ts","../src/causes.ts","../src/format.ts","../src/overlay.ts","../src/batcher.ts","../src/logger.ts"],"sourcesContent":["import type { Fiber, DetectedRender } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Fiber tag constants\n// ────────────────────────────────────────────\n\nexport const FiberTag = {\n  FunctionComponent: 0,\n  ClassComponent: 1,\n  HostComponent: 5,\n  ForwardRef: 11,\n  SimpleMemoComponent: 15,\n  MemoComponent: 14,\n} as const;\n\n// Component tags we report as re-renders.\n// MemoComponent (14) is excluded to avoid double-reporting — it's a wrapper\n// fiber around the inner component. The inner component (FunctionComponent,\n// ForwardRef, or SimpleMemoComponent) has its own PerformedWork flag and\n// will be reported correctly on its own.\nconst COMPONENT_TAGS = new Set<number>([\n  FiberTag.FunctionComponent,\n  FiberTag.ClassComponent,\n  FiberTag.ForwardRef,\n  FiberTag.SimpleMemoComponent,\n]);\n\nconst PerformedWork = 0b0000001;\n\n// ────────────────────────────────────────────\n// Fiber tree helpers\n// ────────────────────────────────────────────\n\nexport function getComponentName(fiber: Fiber): string | null {\n  const { type } = fiber;\n  if (!type || typeof type === \"string\") return null;\n  return type.displayName ?? type.name ?? null;\n}\n\nfunction isHTMLElement(value: unknown): value is HTMLElement {\n  return (\n    typeof value === \"object\" &&\n    value !== null &&\n    (value as Node).nodeType === 1 &&\n    typeof (value as HTMLElement).getBoundingClientRect === \"function\"\n  );\n}\n\nexport function findNearestDOMNode(fiber: Fiber): HTMLElement | null {\n  if (fiber.tag === FiberTag.HostComponent && isHTMLElement(fiber.stateNode)) {\n    return fiber.stateNode;\n  }\n  let child: Fiber | null = fiber.child;\n  while (child) {\n    const found = findNearestDOMNode(child);\n    if (found) return found;\n    child = child.sibling;\n  }\n  return null;\n}\n\nexport function getFiberPath(fiber: Fiber, maxDepth = 5): string {\n  const parts: string[] = [];\n  let current: Fiber | null = fiber.return;\n  let depth = 0;\n  while (current && depth < maxDepth) {\n    const name = getComponentName(current);\n    if (name) parts.unshift(name);\n    current = current.return;\n    depth++;\n  }\n  return parts.length ? parts.join(\" → \") : \"(root)\";\n}\n\n// ────────────────────────────────────────────\n// Self-triggered detection\n// ────────────────────────────────────────────\n\nfunction isSelfTriggered(fiber: Fiber): boolean {\n  const alternate = fiber.alternate;\n  if (!alternate) return false;\n  return fiber.memoizedProps === alternate.memoizedProps;\n}\n\n// ────────────────────────────────────────────\n// didFiberRender — mirrors React DevTools\n// ────────────────────────────────────────────\n//\n// See: react-devtools-shared/src/backend/fiber/shared/DevToolsFiberChangeDetection.js\n//\n// For component fibers (function, class, memo, forwardRef), React sets the\n// PerformedWork flag (bit 0) only when user code actually executes.\n// createWorkInProgress resets flags to NoFlags, so PerformedWork on a\n// work-in-progress fiber is always fresh — never stale from a prior commit.\n//\n// This check must only be called AFTER confirming prevFiber !== nextFiber\n// (i.e. the fiber was actually processed, not a bailed-out subtree).\n\nfunction didFiberRender(nextFiber: Fiber): boolean {\n  return (nextFiber.flags & PerformedWork) === PerformedWork;\n}\n\n// ────────────────────────────────────────────\n// Detect which components re-rendered in a commit\n// ────────────────────────────────────────────\n//\n// Mirrors React DevTools' updateFiberRecursively / updateChildrenRecursively.\n//\n// React double-buffers fibers. After a commit, root.current is the committed\n// tree and root.current.alternate is the previous tree. We walk both in\n// parallel. At each level, if prevChild and nextChild are the same object,\n// React bailed out that entire subtree (via cloneChildFibers) — we skip it.\n// Otherwise, we use nextChild.alternate as the previous fiber and check\n// didFiberRender (PerformedWork) to see if user code actually ran.\n//\n// Returns lightweight DetectedRender objects — just the fiber and its depth.\n// DOM lookup, cause detection, and formatting are the caller's responsibility.\n\nexport function detectRenders(\n  root: Fiber,\n  mode: \"self-triggered\" | \"all\",\n): DetectedRender[] {\n  const results: DetectedRender[] = [];\n  const selfTriggeredOnly = mode === \"self-triggered\";\n\n  // The alternate of the committed root is the previous tree's root.\n  // On initial mount this is null — nothing to report.\n  const previousRoot = root.alternate;\n  if (!previousRoot) return results;\n\n  function walk(\n    nextFiber: Fiber,\n    previousFiber: Fiber | null,\n    depth: number,\n  ) {\n    // ── Check this fiber ──\n    if (\n      COMPONENT_TAGS.has(nextFiber.tag) &&\n      previousFiber !== null &&\n      previousFiber !== nextFiber && // same object → bailed-out subtree\n      didFiberRender(nextFiber) &&\n      (!selfTriggeredOnly || isSelfTriggered(nextFiber))\n    ) {\n      results.push({ fiber: nextFiber, depth });\n    }\n\n    // ── Walk children, matching with previous tree ──\n    let nextChild = nextFiber.child;\n    let previousChildAtSameIndex = previousFiber?.child ?? null;\n\n    while (nextChild) {\n      let matchedPrevious: Fiber | null;\n\n      if (previousChildAtSameIndex === nextChild) {\n        // Same object identity — React shared this fiber via cloneChildFibers.\n        // The entire subtree was bailed out; passing the same object as both\n        // prev and next causes the prevFiber !== nextFiber guard to skip it.\n        matchedPrevious = nextChild;\n      } else {\n        // Different object — this fiber was processed. The alternate is the\n        // corresponding fiber from the previous tree.\n        matchedPrevious = nextChild.alternate;\n      }\n\n      walk(nextChild, matchedPrevious, depth + 1);\n\n      nextChild = nextChild.sibling;\n      previousChildAtSameIndex = previousChildAtSameIndex?.sibling ?? null;\n    }\n  }\n\n  walk(root, previousRoot, 0);\n  return results;\n}\n","import type { Fiber, HookNode, UpdateCause } from \"./types.js\";\nimport { FiberTag } from \"./fiber.js\";\n\n// ────────────────────────────────────────────\n// Update cause detection\n// ────────────────────────────────────────────\n//\n// For function components, React stores hooks as a linked list on\n// fiber.memoizedState. In dev builds, _debugHookTypes lists hook names\n// in call order. We walk both in parallel, comparing memoizedState\n// on each node to find which hook's state actually changed.\n//\n// Caveat: useContext does NOT create a linked list node, so we skip it\n// when advancing the pointer, and detect it by elimination.\n\n/**\n * Hooks whose memoizedState changing can trigger a re-render.\n * We only report these — useEffect/useMemo/etc. don't cause re-renders.\n */\nconst STATE_HOOKS = new Set([\n  \"useState\",\n  \"useReducer\",\n  \"useSyncExternalStore\",\n]);\n\n/**\n * Hooks that do NOT create a node in the memoizedState linked list.\n * Currently only useContext — every other hook allocates a node.\n */\nconst HOOKS_WITHOUT_NODE = new Set([\"useContext\"]);\n\nexport function detectCauses(fiber: Fiber): UpdateCause[] {\n  const alternate = fiber.alternate;\n  if (!alternate) return [];\n\n  const causes: UpdateCause[] = [];\n\n  // ── Props changed (parent re-rendered us with new props) ──\n  if (fiber.memoizedProps !== alternate.memoizedProps) {\n    causes.push({ kind: \"props\" });\n  }\n\n  // ── Class component ──\n  if (fiber.tag === FiberTag.ClassComponent) {\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"class-state\" });\n    }\n    return causes;\n  }\n\n  // ── Function component hooks ──\n  const hookTypes = fiber._debugHookTypes;\n\n  if (!hookTypes) {\n    // No debug info (prod build) — best effort\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"unknown\" });\n    }\n    return causes;\n  }\n\n  let currentNode = fiber.memoizedState as HookNode | null;\n  let previousNode = alternate.memoizedState as HookNode | null;\n  let hasContextHook = false;\n  let anyStateHookChanged = false;\n\n  for (let i = 0; i < hookTypes.length; i++) {\n    const type = hookTypes[i];\n\n    // useContext has no linked list node — skip pointer advance\n    if (HOOKS_WITHOUT_NODE.has(type)) {\n      if (type === \"useContext\") hasContextHook = true;\n      continue;\n    }\n\n    if (STATE_HOOKS.has(type) && currentNode && previousNode) {\n      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {\n        anyStateHookChanged = true;\n        causes.push({\n          kind: \"hook\",\n          hookIndex: i,\n          hookType: type,\n          previousValue: previousNode.memoizedState,\n          nextValue: currentNode.memoizedState,\n        });\n      }\n    }\n\n    currentNode = currentNode?.next ?? null;\n    previousNode = previousNode?.next ?? null;\n  }\n\n  // If no state hook changed but component is self-triggered and has\n  // useContext → the context value must have changed.\n  if (\n    hasContextHook &&\n    !anyStateHookChanged &&\n    fiber.memoizedProps === alternate.memoizedProps\n  ) {\n    causes.push({ kind: \"hook\", hookType: \"useContext\" });\n  }\n\n  // If still nothing and self-triggered, mark unknown\n  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {\n    causes.push({ kind: \"unknown\" });\n  }\n\n  return causes;\n}\n","import type { PendingEntry, UpdateCause } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Value formatting\n// ────────────────────────────────────────────\n\nexport function formatValue(value: unknown, maxLength = 50): string {\n  if (value === null) return \"null\";\n  if (value === undefined) return \"undefined\";\n  if (typeof value === \"boolean\") return String(value);\n  if (typeof value === \"number\") return String(value);\n  if (typeof value === \"function\")\n    return `ƒ ${(value as { name?: string }).name || \"anonymous\"}`;\n\n  if (typeof value === \"string\") {\n    const truncated =\n      value.length > maxLength ? value.slice(0, maxLength) + \"…\" : value;\n    return JSON.stringify(truncated);\n  }\n\n  if (Array.isArray(value)) return `Array(${value.length})`;\n\n  if (typeof value === \"object\") {\n    const name = (value as object).constructor?.name;\n    if (name && name !== \"Object\") return name;\n    const keys = Object.keys(value as object);\n    if (keys.length <= 3) return `{ ${keys.join(\", \")} }`;\n    return `{ ${keys.slice(0, 3).join(\", \")}, … }`;\n  }\n\n  return String(value);\n}\n\n// ────────────────────────────────────────────\n// Cause formatting\n// ────────────────────────────────────────────\n\n/** Compact summary for overlay labels. */\nexport function formatCausesShort(causes: UpdateCause[]): string {\n  if (causes.length === 0) return \"\";\n\n  const parts: string[] = [];\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      parts.push(\"props\");\n    } else if (cause.kind === \"class-state\") {\n      parts.push(\"state\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix = cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      parts.push(`${cause.hookType}${indexSuffix}`);\n    } else {\n      parts.push(\"?\");\n    }\n  }\n\n  return parts.join(\", \");\n}\n\n/** Detailed lines for console output. */\nexport function formatCausesConsole(causes: UpdateCause[]): string[] {\n  const lines: string[] = [];\n\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      lines.push(\"  ↳ props changed (parent re-rendered)\");\n    } else if (cause.kind === \"class-state\") {\n      lines.push(\"  ↳ class state changed\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix =\n        cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      const name = `${cause.hookType}${indexSuffix}`;\n\n      if (cause.previousValue !== undefined && cause.nextValue !== undefined) {\n        lines.push(\n          `  ↳ ${name}: ${formatValue(cause.previousValue)} → ${formatValue(cause.nextValue)}`,\n        );\n      } else {\n        lines.push(`  ↳ ${name} changed`);\n      }\n    } else {\n      lines.push(\"  ↳ unknown cause\");\n    }\n  }\n\n  return lines;\n}\n\n// ────────────────────────────────────────────\n// Console output\n// ────────────────────────────────────────────\n\n/** Log re-renders as a collapsed console group. */\nexport function logRerendersToConsole(\n  entries: PendingEntry[],\n  showCauses: boolean,\n) {\n  if (entries.length === 0) return;\n\n  console.groupCollapsed(\n    `%c⚛ ${entries.length} re-render${entries.length > 1 ? \"s\" : \"\"}`,\n    \"color: #61dafb; font-weight: bold\",\n  );\n\n  for (let i = 0; i < entries.length; i++) {\n    const entry = entries[i];\n    const durationText =\n      entry.duration > 0 ? ` (${entry.duration.toFixed(2)}ms)` : \"\";\n    console.log(\n      `%c${entry.component}%c ${entry.path}${durationText}`,\n      \"color: #e8e82e; font-weight: bold\",\n      \"color: #888\",\n    );\n\n    if (showCauses && entry.causes.length > 0) {\n      const lines = formatCausesConsole(entry.causes);\n      for (const line of lines) {\n        console.log(`%c${line}`, \"color: #aaa\");\n      }\n    }\n  }\n\n  console.groupEnd();\n}\n","// ────────────────────────────────────────────\n// Per-window overlay infrastructure\n// ────────────────────────────────────────────\n//\n// Performance:\n//  - Overlay elements pooled per window, reused via animationend\n//  - Single CSS @keyframes per window, no JS timers per element\n\nconst ANIMATION_NAME = \"__rdu-fade\";\n\nconst injectedWindows = new WeakSet<Window>();\n\nfunction ensureStylesheet(win: Window) {\n  if (injectedWindows.has(win)) return;\n  injectedWindows.add(win);\n\n  const style = win.document.createElement(\"style\");\n  style.textContent = `\n    @keyframes ${ANIMATION_NAME} {\n      0%   { opacity: 0; }\n      8%   { opacity: var(--rdu-opacity, 1); }\n      40%  { opacity: var(--rdu-opacity, 1); }\n      100% { opacity: 0; }\n    }\n    .${ANIMATION_NAME}-box {\n      position: fixed;\n      pointer-events: none;\n      box-sizing: border-box;\n      border-radius: 3px;\n      opacity: 0;\n      will-change: opacity;\n    }\n    .${ANIMATION_NAME}-label {\n      position: absolute;\n      top: -18px;\n      left: -1px;\n      font: 10px/16px ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, monospace;\n      padding: 0 4px;\n      color: #fff;\n      border-radius: 2px 2px 0 0;\n      white-space: nowrap;\n      pointer-events: none;\n    }\n  `;\n  win.document.head.appendChild(style);\n}\n\n// ────────────────────────────────────────────\n// Overlay root container\n// ────────────────────────────────────────────\n\nconst overlayRoots = new WeakMap<Window, HTMLDivElement>();\n\nfunction getOverlayRoot(win: Window): HTMLDivElement | null {\n  if (win.closed) return null;\n\n  const existing = overlayRoots.get(win);\n  if (existing?.isConnected) return existing;\n\n  ensureStylesheet(win);\n\n  const root = win.document.createElement(\"div\");\n  root.id = \"__react-debug-updates\";\n  Object.assign(root.style, {\n    position: \"fixed\",\n    top: \"0\",\n    left: \"0\",\n    width: \"0\",\n    height: \"0\",\n    overflow: \"visible\",\n    pointerEvents: \"none\",\n    zIndex: \"2147483647\",\n  } satisfies Partial<CSSStyleDeclaration>);\n  win.document.body.appendChild(root);\n\n  overlayRoots.set(win, root);\n  return root;\n}\n\n// ────────────────────────────────────────────\n// Element pool\n// ────────────────────────────────────────────\n\nconst pools = new WeakMap<Window, HTMLDivElement[]>();\n\nexport function acquireOverlay(win: Window): HTMLDivElement | null {\n  const root = getOverlayRoot(win);\n  if (!root) return null;\n\n  let pool = pools.get(win);\n  if (!pool) {\n    pool = [];\n    pools.set(win, pool);\n  }\n\n  const document = win.document;\n  let element = pool.pop();\n\n  if (!element) {\n    element = document.createElement(\"div\");\n    element.className = `${ANIMATION_NAME}-box`;\n\n    const label = document.createElement(\"span\");\n    label.className = `${ANIMATION_NAME}-label`;\n    element.appendChild(label);\n\n    element.addEventListener(\"animationend\", () => {\n      element!.style.animation = \"none\";\n      element!.remove();\n      pool!.push(element!);\n    });\n  }\n\n  root.appendChild(element);\n  return element;\n}\n\nexport function disposeAllOverlays() {\n  const mainRoot = overlayRoots.get(window);\n  mainRoot?.remove();\n  overlayRoots.delete(window);\n  pools.delete(window);\n}\n\nexport const OVERLAY_ANIMATION_NAME = ANIMATION_NAME;\n","import type { HighlightOptions, PendingEntry } from \"./types.js\";\nimport { formatCausesShort } from \"./format.js\";\nimport { acquireOverlay, OVERLAY_ANIMATION_NAME } from \"./overlay.js\";\n\n// ────────────────────────────────────────────\n// Heat color\n// ────────────────────────────────────────────\n\nfunction heatColor(count: number, alpha: number): string {\n  const normalizedCount = Math.min((count - 1) / 7, 1);\n  const hue = 200 - normalizedCount * 200;\n  const saturation = 85 + normalizedCount * 15;\n  const lightness = 55 - normalizedCount * 10;\n  return `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`;\n}\n\n// ────────────────────────────────────────────\n// Batched flush\n// ────────────────────────────────────────────\n//\n// Commit path just pushes lightweight refs (no DOM reads, no formatting).\n// Flush (setInterval): batched rect reads → batched DOM writes.\n\nexport const HIGHLIGHT_DEFAULTS: Required<HighlightOptions> = {\n  flushInterval: 250,\n  animationDuration: 1200,\n  showLabels: true,\n  opacity: 0.3,\n};\n\ninterface CoalescedEntry {\n  count: number;\n  totalDuration: number;\n  component: string;\n  /** Shallowest fiber depth among coalesced entries (for z-ordering). */\n  depth: number;\n  domNode: HTMLElement;\n  ownerWindow: Window;\n  causeSummary: string;\n}\n\nexport function createBatcher(options: Required<HighlightOptions>) {\n  let pending: PendingEntry[] = [];\n  let timer: ReturnType<typeof setInterval> | null = null;\n\n  function flush() {\n    if (pending.length === 0) return;\n\n    const batch = pending;\n    pending = [];\n\n    // Coalesce by DOM node identity\n    const map = new Map<HTMLElement, CoalescedEntry>();\n\n    for (let i = 0; i < batch.length; i++) {\n      const entry = batch[i];\n      if (!entry.domNode) continue;\n\n      const existing = map.get(entry.domNode);\n      if (existing) {\n        existing.count++;\n        existing.totalDuration += entry.duration;\n        existing.depth = Math.min(existing.depth, entry.depth);\n      } else {\n        const win = entry.domNode.ownerDocument?.defaultView;\n        if (!win || win.closed) continue;\n        map.set(entry.domNode, {\n          count: 1,\n          totalDuration: entry.duration,\n          component: entry.component,\n          depth: entry.depth,\n          domNode: entry.domNode,\n          ownerWindow: win,\n          causeSummary: formatCausesShort(entry.causes),\n        });\n      }\n    }\n\n    // Read phase: batch all rect reads\n    const toShow: Array<{ coalesced: CoalescedEntry; rect: DOMRect }> = [];\n    for (const coalesced of map.values()) {\n      const rect = coalesced.domNode.getBoundingClientRect();\n      if (rect.width > 0 || rect.height > 0) {\n        toShow.push({ coalesced, rect });\n      }\n    }\n\n    // Sort deepest first so parents are appended last (render on top)\n    toShow.sort((a, b) => b.coalesced.depth - a.coalesced.depth);\n\n    // Write phase: position overlays\n    for (let i = 0; i < toShow.length; i++) {\n      const { coalesced, rect } = toShow[i];\n      const element = acquireOverlay(coalesced.ownerWindow);\n      if (!element) continue;\n\n      const fillColor = heatColor(coalesced.count, 0.18);\n      const borderColor = heatColor(coalesced.count, 0.75);\n      const labelBackground = heatColor(coalesced.count, 0.9);\n\n      const style = element.style;\n      style.top = `${rect.top}px`;\n      style.left = `${rect.left}px`;\n      style.width = `${rect.width}px`;\n      style.height = `${rect.height}px`;\n      style.backgroundColor = fillColor;\n      style.border = `1.5px solid ${borderColor}`;\n      style.setProperty(\"--rdu-opacity\", String(options.opacity));\n      style.animation = `${OVERLAY_ANIMATION_NAME} ${options.animationDuration}ms ease-out forwards`;\n\n      const label = element.firstElementChild as HTMLElement;\n      if (options.showLabels) {\n        const countText = coalesced.count > 1 ? ` ×${coalesced.count}` : \"\";\n        const durationText =\n          coalesced.totalDuration > 0\n            ? ` ${coalesced.totalDuration.toFixed(1)}ms`\n            : \"\";\n        const causeText = coalesced.causeSummary\n          ? ` (${coalesced.causeSummary})`\n          : \"\";\n        label.textContent = `${coalesced.component}${countText}${durationText}${causeText}`;\n        label.style.backgroundColor = labelBackground;\n      } else {\n        label.textContent = \"\";\n        label.style.backgroundColor = \"transparent\";\n      }\n    }\n  }\n\n  function push(entry: PendingEntry) {\n    pending.push(entry);\n    if (!timer) {\n      timer = setInterval(flush, options.flushInterval);\n    }\n  }\n\n  function dispose() {\n    if (timer) {\n      clearInterval(timer);\n      timer = null;\n    }\n    pending = [];\n  }\n\n  return { push, dispose };\n}\n","import type {\n  DevToolsHook,\n  FiberRoot,\n  LoggerOptions,\n  PendingEntry,\n  RenderEntry,\n  RenderLogger,\n} from \"./types.js\";\nimport {\n  detectRenders,\n  findNearestDOMNode,\n  getComponentName,\n  getFiberPath,\n} from \"./fiber.js\";\nimport { detectCauses } from \"./causes.js\";\nimport { logRerendersToConsole } from \"./format.js\";\nimport { HIGHLIGHT_DEFAULTS, createBatcher } from \"./batcher.js\";\nimport { disposeAllOverlays } from \"./overlay.js\";\n\n/**\n * Attach a render logger to React's DevTools hook.\n *\n * Hooks into `__REACT_DEVTOOLS_GLOBAL_HOOK__.onCommitFiberRoot` to intercept\n * every React commit. Records re-render entries, optionally logs them to the\n * console, and optionally shows visual highlight overlays on re-rendered DOM nodes.\n *\n * Returns a `RenderLogger` handle, or `null` if the DevTools hook is not found.\n */\nexport function attachRenderLogger(\n  options: LoggerOptions = {},\n): RenderLogger | null {\n  const {\n    silent = false,\n    bufferSize = 500,\n    filter,\n    highlight = false,\n    mode = \"self-triggered\",\n    showCauses = false,\n  } = options;\n\n  const hook = (\n    window as unknown as { __REACT_DEVTOOLS_GLOBAL_HOOK__?: DevToolsHook }\n  ).__REACT_DEVTOOLS_GLOBAL_HOOK__;\n\n  if (!hook) {\n    console.warn(\n      \"[react-debug-updates] __REACT_DEVTOOLS_GLOBAL_HOOK__ not found. \" +\n        \"Make sure React DevTools or a dev build of React is active.\",\n    );\n    return null;\n  }\n\n  const highlightOptions = highlight\n    ? {\n        ...HIGHLIGHT_DEFAULTS,\n        ...(typeof highlight === \"object\" ? highlight : {}),\n      }\n    : null;\n\n  const batcher = highlightOptions ? createBatcher(highlightOptions) : null;\n\n  const entries: RenderEntry[] = [];\n  const previousOnCommit = hook.onCommitFiberRoot.bind(hook);\n\n  hook.onCommitFiberRoot = (\n    rendererID: number,\n    root: FiberRoot,\n    priorityLevel?: unknown,\n  ) => {\n    previousOnCommit(rendererID, root, priorityLevel);\n\n    // 1. Detect which component fibers actually re-rendered (pure fiber analysis)\n    const detectedRenders = detectRenders(root.current, mode);\n    if (detectedRenders.length === 0) return;\n\n    // 2. Build full entries: resolve names, DOM nodes, causes\n    const pendingEntries: PendingEntry[] = [];\n\n    for (let i = 0; i < detectedRenders.length; i++) {\n      const { fiber, depth } = detectedRenders[i];\n      const name = getComponentName(fiber);\n      if (!name) continue;\n\n      const pendingEntry: PendingEntry = {\n        component: name,\n        path: getFiberPath(fiber),\n        duration: fiber.actualDuration ?? 0,\n        depth,\n        domNode: findNearestDOMNode(fiber),\n        causes: showCauses ? detectCauses(fiber) : [],\n      };\n\n      const renderEntry: RenderEntry = {\n        component: pendingEntry.component,\n        path: pendingEntry.path,\n        duration: pendingEntry.duration,\n        timestamp: performance.now(),\n        causes: pendingEntry.causes,\n      };\n\n      if (filter && !filter(renderEntry)) continue;\n\n      if (entries.length >= bufferSize) entries.shift();\n      entries.push(renderEntry);\n\n      pendingEntries.push(pendingEntry);\n      batcher?.push(pendingEntry);\n    }\n\n    // 3. Console output\n    if (!silent) {\n      logRerendersToConsole(pendingEntries, showCauses);\n    }\n  };\n\n  const disconnect = () => {\n    hook.onCommitFiberRoot = previousOnCommit;\n    batcher?.dispose();\n    disposeAllOverlays();\n  };\n\n  if (!silent) {\n    console.log(\n      \"%c⚛ react-debug-updates attached\",\n      \"color: #61dafb; font-weight: bold\",\n    );\n  }\n\n  return { entries, disconnect 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dist/react-debug-updates.js

@@ -1,60 +0,1 @@
-const STATE_HOOKS = /* @__PURE__ */ new Set([
-  "useState",
-  "useReducer",
-  "useSyncExternalStore"
-]);
-const HOOKS_WITHOUT_NODE = /* @__PURE__ */ new Set(["useContext"]);
-function detectCauses(fiber) {
-  const alternate = fiber.alternate;
-  if (!alternate) return [];
-  const causes = [];
-  if (fiber.memoizedProps !== alternate.memoizedProps) {
-    causes.push({ kind: "props" });
-  }
-  if (fiber.tag === FiberTag.ClassComponent) {
-    if (fiber.memoizedState !== alternate.memoizedState) {
-      causes.push({ kind: "class-state" });
-    }
-    return causes;
-  }
-  const hookTypes = fiber._debugHookTypes;
-  if (!hookTypes) {
-    if (fiber.memoizedState !== alternate.memoizedState) {
-      causes.push({ kind: "unknown" });
-    }
-    return causes;
-  }
-  let currentNode = fiber.memoizedState;
-  let previousNode = alternate.memoizedState;
-  let hasContextHook = false;
-  let anyStateHookChanged = false;
-  for (let i = 0; i < hookTypes.length; i++) {
-    const type = hookTypes[i];
-    if (HOOKS_WITHOUT_NODE.has(type)) {
-      if (type === "useContext") hasContextHook = true;
-      continue;
-    }
-    if (STATE_HOOKS.has(type) && currentNode && previousNode) {
-      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {
-        anyStateHookChanged = true;
-        causes.push({
-          kind: "hook",
-          hookIndex: i,
-          hookType: type,
-          previousValue: previousNode.memoizedState,
-          nextValue: currentNode.memoizedState
-        });
-      }
-    }
-    currentNode = (currentNode == null ? void 0 : currentNode.next) ?? null;
-    previousNode = (previousNode == null ? void 0 : previousNode.next) ?? null;
-  }
-  if (hasContextHook && !anyStateHookChanged && fiber.memoizedProps === alternate.memoizedProps) {
-    causes.push({ kind: "hook", hookType: "useContext" });
-  }
-  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {
-    causes.push({ kind: "unknown" });
-  }
-  return causes;
-}
 const FiberTag = {
@@ -114,21 +55,11 @@ FunctionComponent: 0,
 }
-function collectPending(root, mode, trackCauses) {
-  const entries = [];
+function detectRenders(root, mode) {
+  const results = [];
   const selfTriggeredOnly = mode === "self-triggered";
   const previousRoot = root.alternate;
-  if (!previousRoot) return entries;
+  if (!previousRoot) return results;
   function walk(nextFiber, previousFiber, depth) {
     if (COMPONENT_TAGS.has(nextFiber.tag) && previousFiber !== null && previousFiber !== nextFiber && // same object → bailed-out subtree
     didFiberRender(nextFiber) && (!selfTriggeredOnly || isSelfTriggered(nextFiber))) {
-      const name = getComponentName(nextFiber);
-      if (name) {
-        entries.push({
-          component: name,
-          path: getFiberPath(nextFiber),
-          duration: nextFiber.actualDuration ?? 0,
-          depth,
-          domNode: findNearestDOMNode(nextFiber),
-          causes: trackCauses ? detectCauses(nextFiber) : []
-        });
-      }
+      results.push({ fiber: nextFiber, depth });
     }
@@ -150,4 +81,63 @@ let nextChild = nextFiber.child;
   walk(root, previousRoot, 0);
-  return entries;
+  return results;
 }
+const STATE_HOOKS = /* @__PURE__ */ new Set([
+  "useState",
+  "useReducer",
+  "useSyncExternalStore"
+]);
+const HOOKS_WITHOUT_NODE = /* @__PURE__ */ new Set(["useContext"]);
+function detectCauses(fiber) {
+  const alternate = fiber.alternate;
+  if (!alternate) return [];
+  const causes = [];
+  if (fiber.memoizedProps !== alternate.memoizedProps) {
+    causes.push({ kind: "props" });
+  }
+  if (fiber.tag === FiberTag.ClassComponent) {
+    if (fiber.memoizedState !== alternate.memoizedState) {
+      causes.push({ kind: "class-state" });
+    }
+    return causes;
+  }
+  const hookTypes = fiber._debugHookTypes;
+  if (!hookTypes) {
+    if (fiber.memoizedState !== alternate.memoizedState) {
+      causes.push({ kind: "unknown" });
+    }
+    return causes;
+  }
+  let currentNode = fiber.memoizedState;
+  let previousNode = alternate.memoizedState;
+  let hasContextHook = false;
+  let anyStateHookChanged = false;
+  for (let i = 0; i < hookTypes.length; i++) {
+    const type = hookTypes[i];
+    if (HOOKS_WITHOUT_NODE.has(type)) {
+      if (type === "useContext") hasContextHook = true;
+      continue;
+    }
+    if (STATE_HOOKS.has(type) && currentNode && previousNode) {
+      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {
+        anyStateHookChanged = true;
+        causes.push({
+          kind: "hook",
+          hookIndex: i,
+          hookType: type,
+          previousValue: previousNode.memoizedState,
+          nextValue: currentNode.memoizedState
+        });
+      }
+    }
+    currentNode = (currentNode == null ? void 0 : currentNode.next) ?? null;
+    previousNode = (previousNode == null ? void 0 : previousNode.next) ?? null;
+  }
+  if (hasContextHook && !anyStateHookChanged && fiber.memoizedProps === alternate.memoizedProps) {
+    causes.push({ kind: "hook", hookType: "useContext" });
+  }
+  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {
+    causes.push({ kind: "unknown" });
+  }
+  return causes;
+}
 function formatValue(value, maxLength = 50) {
@@ -215,2 +205,25 @@ var _a;
 }
+function logRerendersToConsole(entries, showCauses) {
+  if (entries.length === 0) return;
+  console.groupCollapsed(
+    `%c⚛ ${entries.length} re-render${entries.length > 1 ? "s" : ""}`,
+    "color: #61dafb; font-weight: bold"
+  );
+  for (let i = 0; i < entries.length; i++) {
+    const entry = entries[i];
+    const durationText = entry.duration > 0 ? ` (${entry.duration.toFixed(2)}ms)` : "";
+    console.log(
+      `%c${entry.component}%c ${entry.path}${durationText}`,
+      "color: #e8e82e; font-weight: bold",
+      "color: #888"
+    );
+    if (showCauses && entry.causes.length > 0) {
+      const lines = formatCausesConsole(entry.causes);
+      for (const line of lines) {
+        console.log(`%c${line}`, "color: #aaa");
+      }
+    }
+  }
+  console.groupEnd();
+}
 const ANIMATION_NAME = "__rdu-fade";
@@ -427,6 +440,18 @@ const injectedWindows = /* @__PURE__ */ new WeakSet();
     previousOnCommit(rendererID, root, priorityLevel);
-    const pendingEntries = collectPending(root.current, mode, showCauses);
-    for (let i = 0; i < pendingEntries.length; i++) {
-      const pendingEntry = pendingEntries[i];
-      const entry = {
+    const detectedRenders = detectRenders(root.current, mode);
+    if (detectedRenders.length === 0) return;
+    const pendingEntries = [];
+    for (let i = 0; i < detectedRenders.length; i++) {
+      const { fiber, depth } = detectedRenders[i];
+      const name = getComponentName(fiber);
+      if (!name) continue;
+      const pendingEntry = {
+        component: name,
+        path: getFiberPath(fiber),
+        duration: fiber.actualDuration ?? 0,
+        depth,
+        domNode: findNearestDOMNode(fiber),
+        causes: showCauses ? detectCauses(fiber) : []
+      };
+      const renderEntry = {
         component: pendingEntry.component,
@@ -438,28 +463,10 @@ path: pendingEntry.path,
       };
-      if (filter && !filter(entry)) continue;
+      if (filter && !filter(renderEntry)) continue;
       if (entries.length >= bufferSize) entries.shift();
-      entries.push(entry);
+      entries.push(renderEntry);
+      pendingEntries.push(pendingEntry);
       batcher == null ? void 0 : batcher.push(pendingEntry);
     }
-    if (!silent && pendingEntries.length > 0) {
-      console.groupCollapsed(
-        `%c⚛ ${pendingEntries.length} re-render${pendingEntries.length > 1 ? "s" : ""}`,
-        "color: #61dafb; font-weight: bold"
-      );
-      for (let i = 0; i < pendingEntries.length; i++) {
-        const pendingEntry = pendingEntries[i];
-        const durationText = pendingEntry.duration > 0 ? ` (${pendingEntry.duration.toFixed(2)}ms)` : "";
-        console.log(
-          `%c${pendingEntry.component}%c ${pendingEntry.path}${durationText}`,
-          "color: #e8e82e; font-weight: bold",
-          "color: #888"
-        );
-        if (showCauses && pendingEntry.causes.length > 0) {
-          const lines = formatCausesConsole(pendingEntry.causes);
-          for (const line of lines) {
-            console.log(`%c${line}`, "color: #aaa");
-          }
-        }
-      }
-      console.groupEnd();
+    if (!silent) {
+      logRerendersToConsole(pendingEntries, showCauses);
     }
@@ -466,0 +473,0 @@ };

dist/react-debug-updates.js.map

@@ -1,1 +0,1 @@
-{"version":3,"file":"react-debug-updates.js","sources":["../src/causes.ts","../src/fiber.ts","../src/format.ts","../src/overlay.ts","../src/batcher.ts","../src/logger.ts"],"sourcesContent":["import type { Fiber, HookNode, UpdateCause } from \"./types.js\";\nimport { FiberTag } from \"./fiber.js\";\n\n// ────────────────────────────────────────────\n// Update cause detection\n// ────────────────────────────────────────────\n//\n// For function components, React stores hooks as a linked list on\n// fiber.memoizedState. In dev builds, _debugHookTypes lists hook names\n// in call order. We walk both in parallel, comparing memoizedState\n// on each node to find which hook's state actually changed.\n//\n// Caveat: useContext does NOT create a linked list node, so we skip it\n// when advancing the pointer, and detect it by elimination.\n\n/**\n * Hooks whose memoizedState changing can trigger a re-render.\n * We only report these — useEffect/useMemo/etc. don't cause re-renders.\n */\nconst STATE_HOOKS = new Set([\n  \"useState\",\n  \"useReducer\",\n  \"useSyncExternalStore\",\n]);\n\n/**\n * Hooks that do NOT create a node in the memoizedState linked list.\n * Currently only useContext — every other hook allocates a node.\n */\nconst HOOKS_WITHOUT_NODE = new Set([\"useContext\"]);\n\nexport function detectCauses(fiber: Fiber): UpdateCause[] {\n  const alternate = fiber.alternate;\n  if (!alternate) return [];\n\n  const causes: UpdateCause[] = [];\n\n  // ── Props changed (parent re-rendered us with new props) ──\n  if (fiber.memoizedProps !== alternate.memoizedProps) {\n    causes.push({ kind: \"props\" });\n  }\n\n  // ── Class component ──\n  if (fiber.tag === FiberTag.ClassComponent) {\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"class-state\" });\n    }\n    return causes;\n  }\n\n  // ── Function component hooks ──\n  const hookTypes = fiber._debugHookTypes;\n\n  if (!hookTypes) {\n    // No debug info (prod build) — best effort\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"unknown\" });\n    }\n    return causes;\n  }\n\n  let currentNode = fiber.memoizedState as HookNode | null;\n  let previousNode = alternate.memoizedState as HookNode | null;\n  let hasContextHook = false;\n  let anyStateHookChanged = false;\n\n  for (let i = 0; i < hookTypes.length; i++) {\n    const type = hookTypes[i];\n\n    // useContext has no linked list node — skip pointer advance\n    if (HOOKS_WITHOUT_NODE.has(type)) {\n      if (type === \"useContext\") hasContextHook = true;\n      continue;\n    }\n\n    if (STATE_HOOKS.has(type) && currentNode && previousNode) {\n      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {\n        anyStateHookChanged = true;\n        causes.push({\n          kind: \"hook\",\n          hookIndex: i,\n          hookType: type,\n          previousValue: previousNode.memoizedState,\n          nextValue: currentNode.memoizedState,\n        });\n      }\n    }\n\n    currentNode = currentNode?.next ?? null;\n    previousNode = previousNode?.next ?? null;\n  }\n\n  // If no state hook changed but component is self-triggered and has\n  // useContext → the context value must have changed.\n  if (\n    hasContextHook &&\n    !anyStateHookChanged &&\n    fiber.memoizedProps === alternate.memoizedProps\n  ) {\n    causes.push({ kind: \"hook\", hookType: \"useContext\" });\n  }\n\n  // If still nothing and self-triggered, mark unknown\n  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {\n    causes.push({ kind: \"unknown\" });\n  }\n\n  return causes;\n}\n","import type { Fiber, PendingEntry } from \"./types.js\";\nimport { detectCauses } from \"./causes.js\";\n\n// ────────────────────────────────────────────\n// Fiber tag constants\n// ────────────────────────────────────────────\n\nexport const FiberTag = {\n  FunctionComponent: 0,\n  ClassComponent: 1,\n  HostComponent: 5,\n  ForwardRef: 11,\n  SimpleMemoComponent: 15,\n  MemoComponent: 14,\n} as const;\n\n// Component tags we report as re-renders.\n// MemoComponent (14) is excluded to avoid double-reporting — it's a wrapper\n// fiber around the inner component. The inner component (FunctionComponent,\n// ForwardRef, or SimpleMemoComponent) has its own PerformedWork flag and\n// will be reported correctly on its own.\nconst COMPONENT_TAGS = new Set<number>([\n  FiberTag.FunctionComponent,\n  FiberTag.ClassComponent,\n  FiberTag.ForwardRef,\n  FiberTag.SimpleMemoComponent,\n]);\n\nconst PerformedWork = 0b0000001;\n\n// ────────────────────────────────────────────\n// Fiber tree helpers\n// ────────────────────────────────────────────\n\nexport function getComponentName(fiber: Fiber): string | null {\n  const { type } = fiber;\n  if (!type || typeof type === \"string\") return null;\n  return type.displayName ?? type.name ?? null;\n}\n\nfunction isHTMLElement(value: unknown): value is HTMLElement {\n  return (\n    typeof value === \"object\" &&\n    value !== null &&\n    (value as Node).nodeType === 1 &&\n    typeof (value as HTMLElement).getBoundingClientRect === \"function\"\n  );\n}\n\nexport function findNearestDOMNode(fiber: Fiber): HTMLElement | null {\n  if (fiber.tag === FiberTag.HostComponent && isHTMLElement(fiber.stateNode)) {\n    return fiber.stateNode;\n  }\n  let child: Fiber | null = fiber.child;\n  while (child) {\n    const found = findNearestDOMNode(child);\n    if (found) return found;\n    child = child.sibling;\n  }\n  return null;\n}\n\nexport function getFiberPath(fiber: Fiber, maxDepth = 5): string {\n  const parts: string[] = [];\n  let current: Fiber | null = fiber.return;\n  let depth = 0;\n  while (current && depth < maxDepth) {\n    const name = getComponentName(current);\n    if (name) parts.unshift(name);\n    current = current.return;\n    depth++;\n  }\n  return parts.length ? parts.join(\" → \") : \"(root)\";\n}\n\n// ────────────────────────────────────────────\n// Self-triggered detection\n// ────────────────────────────────────────────\n\nfunction isSelfTriggered(fiber: Fiber): boolean {\n  const alternate = fiber.alternate;\n  if (!alternate) return false;\n  return fiber.memoizedProps === alternate.memoizedProps;\n}\n\n// ────────────────────────────────────────────\n// didFiberRender — mirrors React DevTools\n// ────────────────────────────────────────────\n//\n// See: react-devtools-shared/src/backend/fiber/shared/DevToolsFiberChangeDetection.js\n//\n// For component fibers (function, class, memo, forwardRef), React sets the\n// PerformedWork flag (bit 0) only when user code actually executes.\n// createWorkInProgress resets flags to NoFlags, so PerformedWork on a\n// work-in-progress fiber is always fresh — never stale from a prior commit.\n//\n// This check must only be called AFTER confirming prevFiber !== nextFiber\n// (i.e. the fiber was actually processed, not a bailed-out subtree).\n\nfunction didFiberRender(nextFiber: Fiber): boolean {\n  return (nextFiber.flags & PerformedWork) === PerformedWork;\n}\n\n// ────────────────────────────────────────────\n// Collect re-rendered components from a commit\n// ────────────────────────────────────────────\n//\n// Mirrors React DevTools' updateFiberRecursively / updateChildrenRecursively.\n//\n// React double-buffers fibers. After a commit, root.current is the committed\n// tree and root.current.alternate is the previous tree. We walk both in\n// parallel. At each level, if prevChild and nextChild are the same object,\n// React bailed out that entire subtree (via cloneChildFibers) — we skip it.\n// Otherwise, we use nextChild.alternate as the previous fiber and check\n// didFiberRender (PerformedWork) to see if user code actually ran.\n\nexport function collectPending(\n  root: Fiber,\n  mode: \"self-triggered\" | \"all\",\n  trackCauses: boolean,\n): PendingEntry[] {\n  const entries: PendingEntry[] = [];\n  const selfTriggeredOnly = mode === \"self-triggered\";\n\n  // The alternate of the committed root is the previous tree's root.\n  // On initial mount this is null — nothing to report.\n  const previousRoot = root.alternate;\n  if (!previousRoot) return entries;\n\n  function walk(\n    nextFiber: Fiber,\n    previousFiber: Fiber | null,\n    depth: number,\n  ) {\n    // ── Check this fiber ──\n    if (\n      COMPONENT_TAGS.has(nextFiber.tag) &&\n      previousFiber !== null &&\n      previousFiber !== nextFiber && // same object → bailed-out subtree\n      didFiberRender(nextFiber) &&\n      (!selfTriggeredOnly || isSelfTriggered(nextFiber))\n    ) {\n      const name = getComponentName(nextFiber);\n      if (name) {\n        entries.push({\n          component: name,\n          path: getFiberPath(nextFiber),\n          duration: nextFiber.actualDuration ?? 0,\n          depth,\n          domNode: findNearestDOMNode(nextFiber),\n          causes: trackCauses ? detectCauses(nextFiber) : [],\n        });\n      }\n    }\n\n    // ── Walk children, matching with previous tree ──\n    let nextChild = nextFiber.child;\n    let previousChildAtSameIndex = previousFiber?.child ?? null;\n\n    while (nextChild) {\n      let matchedPrevious: Fiber | null;\n\n      if (previousChildAtSameIndex === nextChild) {\n        // Same object identity — React shared this fiber via cloneChildFibers.\n        // The entire subtree was bailed out; passing the same object as both\n        // prev and next causes the prevFiber !== nextFiber guard to skip it.\n        matchedPrevious = nextChild;\n      } else {\n        // Different object — this fiber was processed. The alternate is the\n        // corresponding fiber from the previous tree.\n        matchedPrevious = nextChild.alternate;\n      }\n\n      walk(nextChild, matchedPrevious, depth + 1);\n\n      nextChild = nextChild.sibling;\n      previousChildAtSameIndex = previousChildAtSameIndex?.sibling ?? null;\n    }\n  }\n\n  walk(root, previousRoot, 0);\n  return entries;\n}\n","import type { UpdateCause } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Value formatting\n// ────────────────────────────────────────────\n\nexport function formatValue(value: unknown, maxLength = 50): string {\n  if (value === null) return \"null\";\n  if (value === undefined) return \"undefined\";\n  if (typeof value === \"boolean\") return String(value);\n  if (typeof value === \"number\") return String(value);\n  if (typeof value === \"function\")\n    return `ƒ ${(value as { name?: string }).name || \"anonymous\"}`;\n\n  if (typeof value === \"string\") {\n    const truncated =\n      value.length > maxLength ? value.slice(0, maxLength) + \"…\" : value;\n    return JSON.stringify(truncated);\n  }\n\n  if (Array.isArray(value)) return `Array(${value.length})`;\n\n  if (typeof value === \"object\") {\n    const name = (value as object).constructor?.name;\n    if (name && name !== \"Object\") return name;\n    const keys = Object.keys(value as object);\n    if (keys.length <= 3) return `{ ${keys.join(\", \")} }`;\n    return `{ ${keys.slice(0, 3).join(\", \")}, … }`;\n  }\n\n  return String(value);\n}\n\n// ────────────────────────────────────────────\n// Cause formatting\n// ────────────────────────────────────────────\n\n/** Compact summary for overlay labels. */\nexport function formatCausesShort(causes: UpdateCause[]): string {\n  if (causes.length === 0) return \"\";\n\n  const parts: string[] = [];\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      parts.push(\"props\");\n    } else if (cause.kind === \"class-state\") {\n      parts.push(\"state\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix = cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      parts.push(`${cause.hookType}${indexSuffix}`);\n    } else {\n      parts.push(\"?\");\n    }\n  }\n\n  return parts.join(\", \");\n}\n\n/** Detailed lines for console output. */\nexport function formatCausesConsole(causes: UpdateCause[]): string[] {\n  const lines: string[] = [];\n\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      lines.push(\"  ↳ props changed (parent re-rendered)\");\n    } else if (cause.kind === \"class-state\") {\n      lines.push(\"  ↳ class state changed\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix =\n        cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      const name = `${cause.hookType}${indexSuffix}`;\n\n      if (cause.previousValue !== undefined && cause.nextValue !== undefined) {\n        lines.push(\n          `  ↳ ${name}: ${formatValue(cause.previousValue)} → ${formatValue(cause.nextValue)}`,\n        );\n      } else {\n        lines.push(`  ↳ ${name} changed`);\n      }\n    } else {\n      lines.push(\"  ↳ unknown cause\");\n    }\n  }\n\n  return lines;\n}\n","// ────────────────────────────────────────────\n// Per-window overlay infrastructure\n// ────────────────────────────────────────────\n//\n// Performance:\n//  - Overlay elements pooled per window, reused via animationend\n//  - Single CSS @keyframes per window, no JS timers per element\n\nconst ANIMATION_NAME = \"__rdu-fade\";\n\nconst injectedWindows = new WeakSet<Window>();\n\nfunction ensureStylesheet(win: Window) {\n  if (injectedWindows.has(win)) return;\n  injectedWindows.add(win);\n\n  const style = win.document.createElement(\"style\");\n  style.textContent = `\n    @keyframes ${ANIMATION_NAME} {\n      0%   { opacity: 0; }\n      8%   { opacity: var(--rdu-opacity, 1); }\n      40%  { opacity: var(--rdu-opacity, 1); }\n      100% { opacity: 0; }\n    }\n    .${ANIMATION_NAME}-box {\n      position: fixed;\n      pointer-events: none;\n      box-sizing: border-box;\n      border-radius: 3px;\n      opacity: 0;\n      will-change: opacity;\n    }\n    .${ANIMATION_NAME}-label {\n      position: absolute;\n      top: -18px;\n      left: -1px;\n      font: 10px/16px ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, monospace;\n      padding: 0 4px;\n      color: #fff;\n      border-radius: 2px 2px 0 0;\n      white-space: nowrap;\n      pointer-events: none;\n    }\n  `;\n  win.document.head.appendChild(style);\n}\n\n// ────────────────────────────────────────────\n// Overlay root container\n// ────────────────────────────────────────────\n\nconst overlayRoots = new WeakMap<Window, HTMLDivElement>();\n\nfunction getOverlayRoot(win: Window): HTMLDivElement | null {\n  if (win.closed) return null;\n\n  const existing = overlayRoots.get(win);\n  if (existing?.isConnected) return existing;\n\n  ensureStylesheet(win);\n\n  const root = win.document.createElement(\"div\");\n  root.id = \"__react-debug-updates\";\n  Object.assign(root.style, {\n    position: \"fixed\",\n    top: \"0\",\n    left: \"0\",\n    width: \"0\",\n    height: \"0\",\n    overflow: \"visible\",\n    pointerEvents: \"none\",\n    zIndex: \"2147483647\",\n  } satisfies Partial<CSSStyleDeclaration>);\n  win.document.body.appendChild(root);\n\n  overlayRoots.set(win, root);\n  return root;\n}\n\n// ────────────────────────────────────────────\n// Element pool\n// ────────────────────────────────────────────\n\nconst pools = new WeakMap<Window, HTMLDivElement[]>();\n\nexport function acquireOverlay(win: Window): HTMLDivElement | null {\n  const root = getOverlayRoot(win);\n  if (!root) return null;\n\n  let pool = pools.get(win);\n  if (!pool) {\n    pool = [];\n    pools.set(win, pool);\n  }\n\n  const document = win.document;\n  let element = pool.pop();\n\n  if (!element) {\n    element = document.createElement(\"div\");\n    element.className = `${ANIMATION_NAME}-box`;\n\n    const label = document.createElement(\"span\");\n    label.className = `${ANIMATION_NAME}-label`;\n    element.appendChild(label);\n\n    element.addEventListener(\"animationend\", () => {\n      element!.style.animation = \"none\";\n      element!.remove();\n      pool!.push(element!);\n    });\n  }\n\n  root.appendChild(element);\n  return element;\n}\n\nexport function disposeAllOverlays() {\n  const mainRoot = overlayRoots.get(window);\n  mainRoot?.remove();\n  overlayRoots.delete(window);\n  pools.delete(window);\n}\n\nexport const OVERLAY_ANIMATION_NAME = ANIMATION_NAME;\n","import type { HighlightOptions, PendingEntry } from \"./types.js\";\nimport { formatCausesShort } from \"./format.js\";\nimport { acquireOverlay, OVERLAY_ANIMATION_NAME } from \"./overlay.js\";\n\n// ────────────────────────────────────────────\n// Heat color\n// ────────────────────────────────────────────\n\nfunction heatColor(count: number, alpha: number): string {\n  const normalizedCount = Math.min((count - 1) / 7, 1);\n  const hue = 200 - normalizedCount * 200;\n  const saturation = 85 + normalizedCount * 15;\n  const lightness = 55 - normalizedCount * 10;\n  return `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`;\n}\n\n// ────────────────────────────────────────────\n// Batched flush\n// ────────────────────────────────────────────\n//\n// Commit path just pushes lightweight refs (no DOM reads, no formatting).\n// Flush (setInterval): batched rect reads → batched DOM writes.\n\nexport const HIGHLIGHT_DEFAULTS: Required<HighlightOptions> = {\n  flushInterval: 250,\n  animationDuration: 1200,\n  showLabels: true,\n  opacity: 0.3,\n};\n\ninterface CoalescedEntry {\n  count: number;\n  totalDuration: number;\n  component: string;\n  /** Shallowest fiber depth among coalesced entries (for z-ordering). */\n  depth: number;\n  domNode: HTMLElement;\n  ownerWindow: Window;\n  causeSummary: string;\n}\n\nexport function createBatcher(options: Required<HighlightOptions>) {\n  let pending: PendingEntry[] = [];\n  let timer: ReturnType<typeof setInterval> | null = null;\n\n  function flush() {\n    if (pending.length === 0) return;\n\n    const batch = pending;\n    pending = [];\n\n    // Coalesce by DOM node identity\n    const map = new Map<HTMLElement, CoalescedEntry>();\n\n    for (let i = 0; i < batch.length; i++) {\n      const entry = batch[i];\n      if (!entry.domNode) continue;\n\n      const existing = map.get(entry.domNode);\n      if (existing) {\n        existing.count++;\n        existing.totalDuration += entry.duration;\n        existing.depth = Math.min(existing.depth, entry.depth);\n      } else {\n        const win = entry.domNode.ownerDocument?.defaultView;\n        if (!win || win.closed) continue;\n        map.set(entry.domNode, {\n          count: 1,\n          totalDuration: entry.duration,\n          component: entry.component,\n          depth: entry.depth,\n          domNode: entry.domNode,\n          ownerWindow: win,\n          causeSummary: formatCausesShort(entry.causes),\n        });\n      }\n    }\n\n    // Read phase: batch all rect reads\n    const toShow: Array<{ coalesced: CoalescedEntry; rect: DOMRect }> = [];\n    for (const coalesced of map.values()) {\n      const rect = coalesced.domNode.getBoundingClientRect();\n      if (rect.width > 0 || rect.height > 0) {\n        toShow.push({ coalesced, rect });\n      }\n    }\n\n    // Sort deepest first so parents are appended last (render on top)\n    toShow.sort((a, b) => b.coalesced.depth - a.coalesced.depth);\n\n    // Write phase: position overlays\n    for (let i = 0; i < toShow.length; i++) {\n      const { coalesced, rect } = toShow[i];\n      const element = acquireOverlay(coalesced.ownerWindow);\n      if (!element) continue;\n\n      const fillColor = heatColor(coalesced.count, 0.18);\n      const borderColor = heatColor(coalesced.count, 0.75);\n      const labelBackground = heatColor(coalesced.count, 0.9);\n\n      const style = element.style;\n      style.top = `${rect.top}px`;\n      style.left = `${rect.left}px`;\n      style.width = `${rect.width}px`;\n      style.height = `${rect.height}px`;\n      style.backgroundColor = fillColor;\n      style.border = `1.5px solid ${borderColor}`;\n      style.setProperty(\"--rdu-opacity\", String(options.opacity));\n      style.animation = `${OVERLAY_ANIMATION_NAME} ${options.animationDuration}ms ease-out forwards`;\n\n      const label = element.firstElementChild as HTMLElement;\n      if (options.showLabels) {\n        const countText = coalesced.count > 1 ? ` ×${coalesced.count}` : \"\";\n        const durationText =\n          coalesced.totalDuration > 0\n            ? ` ${coalesced.totalDuration.toFixed(1)}ms`\n            : \"\";\n        const causeText = coalesced.causeSummary\n          ? ` (${coalesced.causeSummary})`\n          : \"\";\n        label.textContent = `${coalesced.component}${countText}${durationText}${causeText}`;\n        label.style.backgroundColor = labelBackground;\n      } else {\n        label.textContent = \"\";\n        label.style.backgroundColor = \"transparent\";\n      }\n    }\n  }\n\n  function push(entry: PendingEntry) {\n    pending.push(entry);\n    if (!timer) {\n      timer = setInterval(flush, options.flushInterval);\n    }\n  }\n\n  function dispose() {\n    if (timer) {\n      clearInterval(timer);\n      timer = null;\n    }\n    pending = [];\n  }\n\n  return { push, dispose };\n}\n","import type {\n  DevToolsHook,\n  FiberRoot,\n  LoggerOptions,\n  RenderEntry,\n  RenderLogger,\n} from \"./types.js\";\nimport { collectPending } from \"./fiber.js\";\nimport { formatCausesConsole } from \"./format.js\";\nimport { HIGHLIGHT_DEFAULTS, createBatcher } from \"./batcher.js\";\nimport { disposeAllOverlays } from \"./overlay.js\";\n\n/**\n * Attach a render logger to React's DevTools hook.\n *\n * Hooks into `__REACT_DEVTOOLS_GLOBAL_HOOK__.onCommitFiberRoot` to intercept\n * every React commit. Records re-render entries, optionally logs them to the\n * console, and optionally shows visual highlight overlays on re-rendered DOM nodes.\n *\n * Returns a `RenderLogger` handle, or `null` if the DevTools hook is not found.\n */\nexport function attachRenderLogger(\n  options: LoggerOptions = {},\n): RenderLogger | null {\n  const {\n    silent = false,\n    bufferSize = 500,\n    filter,\n    highlight = false,\n    mode = \"self-triggered\",\n    showCauses = false,\n  } = options;\n\n  const hook = (\n    window as unknown as { __REACT_DEVTOOLS_GLOBAL_HOOK__?: DevToolsHook }\n  ).__REACT_DEVTOOLS_GLOBAL_HOOK__;\n\n  if (!hook) {\n    console.warn(\n      \"[react-debug-updates] __REACT_DEVTOOLS_GLOBAL_HOOK__ not found. \" +\n        \"Make sure React DevTools or a dev build of React is active.\",\n    );\n    return null;\n  }\n\n  const highlightOptions = highlight\n    ? {\n        ...HIGHLIGHT_DEFAULTS,\n        ...(typeof highlight === \"object\" ? highlight : {}),\n      }\n    : null;\n\n  const batcher = highlightOptions ? createBatcher(highlightOptions) : null;\n\n  const entries: RenderEntry[] = [];\n  const previousOnCommit = hook.onCommitFiberRoot.bind(hook);\n\n  hook.onCommitFiberRoot = (\n    rendererID: number,\n    root: FiberRoot,\n    priorityLevel?: unknown,\n  ) => {\n    previousOnCommit(rendererID, root, priorityLevel);\n\n    const pendingEntries = collectPending(root.current, mode, showCauses);\n\n    for (let i = 0; i < pendingEntries.length; i++) {\n      const pendingEntry = pendingEntries[i];\n\n      const entry: RenderEntry = {\n        component: pendingEntry.component,\n        path: pendingEntry.path,\n        duration: pendingEntry.duration,\n        timestamp: performance.now(),\n        causes: pendingEntry.causes,\n      };\n\n      if (filter && !filter(entry)) continue;\n\n      if (entries.length >= bufferSize) entries.shift();\n      entries.push(entry);\n\n      batcher?.push(pendingEntry);\n    }\n\n    // Console output\n    if (!silent && pendingEntries.length > 0) {\n      console.groupCollapsed(\n        `%c⚛ ${pendingEntries.length} re-render${pendingEntries.length > 1 ? \"s\" : \"\"}`,\n        \"color: #61dafb; font-weight: bold\",\n      );\n\n      for (let i = 0; i < pendingEntries.length; i++) {\n        const pendingEntry = pendingEntries[i];\n        const durationText =\n          pendingEntry.duration > 0\n            ? ` (${pendingEntry.duration.toFixed(2)}ms)`\n            : \"\";\n        console.log(\n          `%c${pendingEntry.component}%c ${pendingEntry.path}${durationText}`,\n          \"color: #e8e82e; font-weight: bold\",\n          \"color: #888\",\n        );\n\n        if (showCauses && pendingEntry.causes.length > 0) {\n          const lines = formatCausesConsole(pendingEntry.causes);\n          for (const line of lines) {\n            console.log(`%c${line}`, \"color: #aaa\");\n          }\n        }\n      }\n\n      console.groupEnd();\n    }\n  };\n\n  const disconnect = () => {\n    hook.onCommitFiberRoot = previousOnCommit;\n    batcher?.dispose();\n    disposeAllOverlays();\n  };\n\n  if (!silent) {\n    console.log(\n      \"%c⚛ react-debug-updates attached\",\n      \"color: #61dafb; font-weight: bold\",\n    );\n  }\n\n  return { entries, disconnect 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+{"version":3,"file":"react-debug-updates.js","sources":["../src/fiber.ts","../src/causes.ts","../src/format.ts","../src/overlay.ts","../src/batcher.ts","../src/logger.ts"],"sourcesContent":["import type { Fiber, DetectedRender } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Fiber tag constants\n// ────────────────────────────────────────────\n\nexport const FiberTag = {\n  FunctionComponent: 0,\n  ClassComponent: 1,\n  HostComponent: 5,\n  ForwardRef: 11,\n  SimpleMemoComponent: 15,\n  MemoComponent: 14,\n} as const;\n\n// Component tags we report as re-renders.\n// MemoComponent (14) is excluded to avoid double-reporting — it's a wrapper\n// fiber around the inner component. The inner component (FunctionComponent,\n// ForwardRef, or SimpleMemoComponent) has its own PerformedWork flag and\n// will be reported correctly on its own.\nconst COMPONENT_TAGS = new Set<number>([\n  FiberTag.FunctionComponent,\n  FiberTag.ClassComponent,\n  FiberTag.ForwardRef,\n  FiberTag.SimpleMemoComponent,\n]);\n\nconst PerformedWork = 0b0000001;\n\n// ────────────────────────────────────────────\n// Fiber tree helpers\n// ────────────────────────────────────────────\n\nexport function getComponentName(fiber: Fiber): string | null {\n  const { type } = fiber;\n  if (!type || typeof type === \"string\") return null;\n  return type.displayName ?? type.name ?? null;\n}\n\nfunction isHTMLElement(value: unknown): value is HTMLElement {\n  return (\n    typeof value === \"object\" &&\n    value !== null &&\n    (value as Node).nodeType === 1 &&\n    typeof (value as HTMLElement).getBoundingClientRect === \"function\"\n  );\n}\n\nexport function findNearestDOMNode(fiber: Fiber): HTMLElement | null {\n  if (fiber.tag === FiberTag.HostComponent && isHTMLElement(fiber.stateNode)) {\n    return fiber.stateNode;\n  }\n  let child: Fiber | null = fiber.child;\n  while (child) {\n    const found = findNearestDOMNode(child);\n    if (found) return found;\n    child = child.sibling;\n  }\n  return null;\n}\n\nexport function getFiberPath(fiber: Fiber, maxDepth = 5): string {\n  const parts: string[] = [];\n  let current: Fiber | null = fiber.return;\n  let depth = 0;\n  while (current && depth < maxDepth) {\n    const name = getComponentName(current);\n    if (name) parts.unshift(name);\n    current = current.return;\n    depth++;\n  }\n  return parts.length ? parts.join(\" → \") : \"(root)\";\n}\n\n// ────────────────────────────────────────────\n// Self-triggered detection\n// ────────────────────────────────────────────\n\nfunction isSelfTriggered(fiber: Fiber): boolean {\n  const alternate = fiber.alternate;\n  if (!alternate) return false;\n  return fiber.memoizedProps === alternate.memoizedProps;\n}\n\n// ────────────────────────────────────────────\n// didFiberRender — mirrors React DevTools\n// ────────────────────────────────────────────\n//\n// See: react-devtools-shared/src/backend/fiber/shared/DevToolsFiberChangeDetection.js\n//\n// For component fibers (function, class, memo, forwardRef), React sets the\n// PerformedWork flag (bit 0) only when user code actually executes.\n// createWorkInProgress resets flags to NoFlags, so PerformedWork on a\n// work-in-progress fiber is always fresh — never stale from a prior commit.\n//\n// This check must only be called AFTER confirming prevFiber !== nextFiber\n// (i.e. the fiber was actually processed, not a bailed-out subtree).\n\nfunction didFiberRender(nextFiber: Fiber): boolean {\n  return (nextFiber.flags & PerformedWork) === PerformedWork;\n}\n\n// ────────────────────────────────────────────\n// Detect which components re-rendered in a commit\n// ────────────────────────────────────────────\n//\n// Mirrors React DevTools' updateFiberRecursively / updateChildrenRecursively.\n//\n// React double-buffers fibers. After a commit, root.current is the committed\n// tree and root.current.alternate is the previous tree. We walk both in\n// parallel. At each level, if prevChild and nextChild are the same object,\n// React bailed out that entire subtree (via cloneChildFibers) — we skip it.\n// Otherwise, we use nextChild.alternate as the previous fiber and check\n// didFiberRender (PerformedWork) to see if user code actually ran.\n//\n// Returns lightweight DetectedRender objects — just the fiber and its depth.\n// DOM lookup, cause detection, and formatting are the caller's responsibility.\n\nexport function detectRenders(\n  root: Fiber,\n  mode: \"self-triggered\" | \"all\",\n): DetectedRender[] {\n  const results: DetectedRender[] = [];\n  const selfTriggeredOnly = mode === \"self-triggered\";\n\n  // The alternate of the committed root is the previous tree's root.\n  // On initial mount this is null — nothing to report.\n  const previousRoot = root.alternate;\n  if (!previousRoot) return results;\n\n  function walk(\n    nextFiber: Fiber,\n    previousFiber: Fiber | null,\n    depth: number,\n  ) {\n    // ── Check this fiber ──\n    if (\n      COMPONENT_TAGS.has(nextFiber.tag) &&\n      previousFiber !== null &&\n      previousFiber !== nextFiber && // same object → bailed-out subtree\n      didFiberRender(nextFiber) &&\n      (!selfTriggeredOnly || isSelfTriggered(nextFiber))\n    ) {\n      results.push({ fiber: nextFiber, depth });\n    }\n\n    // ── Walk children, matching with previous tree ──\n    let nextChild = nextFiber.child;\n    let previousChildAtSameIndex = previousFiber?.child ?? null;\n\n    while (nextChild) {\n      let matchedPrevious: Fiber | null;\n\n      if (previousChildAtSameIndex === nextChild) {\n        // Same object identity — React shared this fiber via cloneChildFibers.\n        // The entire subtree was bailed out; passing the same object as both\n        // prev and next causes the prevFiber !== nextFiber guard to skip it.\n        matchedPrevious = nextChild;\n      } else {\n        // Different object — this fiber was processed. The alternate is the\n        // corresponding fiber from the previous tree.\n        matchedPrevious = nextChild.alternate;\n      }\n\n      walk(nextChild, matchedPrevious, depth + 1);\n\n      nextChild = nextChild.sibling;\n      previousChildAtSameIndex = previousChildAtSameIndex?.sibling ?? null;\n    }\n  }\n\n  walk(root, previousRoot, 0);\n  return results;\n}\n","import type { Fiber, HookNode, UpdateCause } from \"./types.js\";\nimport { FiberTag } from \"./fiber.js\";\n\n// ────────────────────────────────────────────\n// Update cause detection\n// ────────────────────────────────────────────\n//\n// For function components, React stores hooks as a linked list on\n// fiber.memoizedState. In dev builds, _debugHookTypes lists hook names\n// in call order. We walk both in parallel, comparing memoizedState\n// on each node to find which hook's state actually changed.\n//\n// Caveat: useContext does NOT create a linked list node, so we skip it\n// when advancing the pointer, and detect it by elimination.\n\n/**\n * Hooks whose memoizedState changing can trigger a re-render.\n * We only report these — useEffect/useMemo/etc. don't cause re-renders.\n */\nconst STATE_HOOKS = new Set([\n  \"useState\",\n  \"useReducer\",\n  \"useSyncExternalStore\",\n]);\n\n/**\n * Hooks that do NOT create a node in the memoizedState linked list.\n * Currently only useContext — every other hook allocates a node.\n */\nconst HOOKS_WITHOUT_NODE = new Set([\"useContext\"]);\n\nexport function detectCauses(fiber: Fiber): UpdateCause[] {\n  const alternate = fiber.alternate;\n  if (!alternate) return [];\n\n  const causes: UpdateCause[] = [];\n\n  // ── Props changed (parent re-rendered us with new props) ──\n  if (fiber.memoizedProps !== alternate.memoizedProps) {\n    causes.push({ kind: \"props\" });\n  }\n\n  // ── Class component ──\n  if (fiber.tag === FiberTag.ClassComponent) {\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"class-state\" });\n    }\n    return causes;\n  }\n\n  // ── Function component hooks ──\n  const hookTypes = fiber._debugHookTypes;\n\n  if (!hookTypes) {\n    // No debug info (prod build) — best effort\n    if (fiber.memoizedState !== alternate.memoizedState) {\n      causes.push({ kind: \"unknown\" });\n    }\n    return causes;\n  }\n\n  let currentNode = fiber.memoizedState as HookNode | null;\n  let previousNode = alternate.memoizedState as HookNode | null;\n  let hasContextHook = false;\n  let anyStateHookChanged = false;\n\n  for (let i = 0; i < hookTypes.length; i++) {\n    const type = hookTypes[i];\n\n    // useContext has no linked list node — skip pointer advance\n    if (HOOKS_WITHOUT_NODE.has(type)) {\n      if (type === \"useContext\") hasContextHook = true;\n      continue;\n    }\n\n    if (STATE_HOOKS.has(type) && currentNode && previousNode) {\n      if (!Object.is(currentNode.memoizedState, previousNode.memoizedState)) {\n        anyStateHookChanged = true;\n        causes.push({\n          kind: \"hook\",\n          hookIndex: i,\n          hookType: type,\n          previousValue: previousNode.memoizedState,\n          nextValue: currentNode.memoizedState,\n        });\n      }\n    }\n\n    currentNode = currentNode?.next ?? null;\n    previousNode = previousNode?.next ?? null;\n  }\n\n  // If no state hook changed but component is self-triggered and has\n  // useContext → the context value must have changed.\n  if (\n    hasContextHook &&\n    !anyStateHookChanged &&\n    fiber.memoizedProps === alternate.memoizedProps\n  ) {\n    causes.push({ kind: \"hook\", hookType: \"useContext\" });\n  }\n\n  // If still nothing and self-triggered, mark unknown\n  if (causes.length === 0 && fiber.memoizedProps === alternate.memoizedProps) {\n    causes.push({ kind: \"unknown\" });\n  }\n\n  return causes;\n}\n","import type { PendingEntry, UpdateCause } from \"./types.js\";\n\n// ────────────────────────────────────────────\n// Value formatting\n// ────────────────────────────────────────────\n\nexport function formatValue(value: unknown, maxLength = 50): string {\n  if (value === null) return \"null\";\n  if (value === undefined) return \"undefined\";\n  if (typeof value === \"boolean\") return String(value);\n  if (typeof value === \"number\") return String(value);\n  if (typeof value === \"function\")\n    return `ƒ ${(value as { name?: string }).name || \"anonymous\"}`;\n\n  if (typeof value === \"string\") {\n    const truncated =\n      value.length > maxLength ? value.slice(0, maxLength) + \"…\" : value;\n    return JSON.stringify(truncated);\n  }\n\n  if (Array.isArray(value)) return `Array(${value.length})`;\n\n  if (typeof value === \"object\") {\n    const name = (value as object).constructor?.name;\n    if (name && name !== \"Object\") return name;\n    const keys = Object.keys(value as object);\n    if (keys.length <= 3) return `{ ${keys.join(\", \")} }`;\n    return `{ ${keys.slice(0, 3).join(\", \")}, … }`;\n  }\n\n  return String(value);\n}\n\n// ────────────────────────────────────────────\n// Cause formatting\n// ────────────────────────────────────────────\n\n/** Compact summary for overlay labels. */\nexport function formatCausesShort(causes: UpdateCause[]): string {\n  if (causes.length === 0) return \"\";\n\n  const parts: string[] = [];\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      parts.push(\"props\");\n    } else if (cause.kind === \"class-state\") {\n      parts.push(\"state\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix = cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      parts.push(`${cause.hookType}${indexSuffix}`);\n    } else {\n      parts.push(\"?\");\n    }\n  }\n\n  return parts.join(\", \");\n}\n\n/** Detailed lines for console output. */\nexport function formatCausesConsole(causes: UpdateCause[]): string[] {\n  const lines: string[] = [];\n\n  for (const cause of causes) {\n    if (cause.kind === \"props\") {\n      lines.push(\"  ↳ props changed (parent re-rendered)\");\n    } else if (cause.kind === \"class-state\") {\n      lines.push(\"  ↳ class state changed\");\n    } else if (cause.kind === \"hook\" && cause.hookType) {\n      const indexSuffix =\n        cause.hookIndex != null ? `[${cause.hookIndex}]` : \"\";\n      const name = `${cause.hookType}${indexSuffix}`;\n\n      if (cause.previousValue !== undefined && cause.nextValue !== undefined) {\n        lines.push(\n          `  ↳ ${name}: ${formatValue(cause.previousValue)} → ${formatValue(cause.nextValue)}`,\n        );\n      } else {\n        lines.push(`  ↳ ${name} changed`);\n      }\n    } else {\n      lines.push(\"  ↳ unknown cause\");\n    }\n  }\n\n  return lines;\n}\n\n// ────────────────────────────────────────────\n// Console output\n// ────────────────────────────────────────────\n\n/** Log re-renders as a collapsed console group. */\nexport function logRerendersToConsole(\n  entries: PendingEntry[],\n  showCauses: boolean,\n) {\n  if (entries.length === 0) return;\n\n  console.groupCollapsed(\n    `%c⚛ ${entries.length} re-render${entries.length > 1 ? \"s\" : \"\"}`,\n    \"color: #61dafb; font-weight: bold\",\n  );\n\n  for (let i = 0; i < entries.length; i++) {\n    const entry = entries[i];\n    const durationText =\n      entry.duration > 0 ? ` (${entry.duration.toFixed(2)}ms)` : \"\";\n    console.log(\n      `%c${entry.component}%c ${entry.path}${durationText}`,\n      \"color: #e8e82e; font-weight: bold\",\n      \"color: #888\",\n    );\n\n    if (showCauses && entry.causes.length > 0) {\n      const lines = formatCausesConsole(entry.causes);\n      for (const line of lines) {\n        console.log(`%c${line}`, \"color: #aaa\");\n      }\n    }\n  }\n\n  console.groupEnd();\n}\n","// ────────────────────────────────────────────\n// Per-window overlay infrastructure\n// ────────────────────────────────────────────\n//\n// Performance:\n//  - Overlay elements pooled per window, reused via animationend\n//  - Single CSS @keyframes per window, no JS timers per element\n\nconst ANIMATION_NAME = \"__rdu-fade\";\n\nconst injectedWindows = new WeakSet<Window>();\n\nfunction ensureStylesheet(win: Window) {\n  if (injectedWindows.has(win)) return;\n  injectedWindows.add(win);\n\n  const style = win.document.createElement(\"style\");\n  style.textContent = `\n    @keyframes ${ANIMATION_NAME} {\n      0%   { opacity: 0; }\n      8%   { opacity: var(--rdu-opacity, 1); }\n      40%  { opacity: var(--rdu-opacity, 1); }\n      100% { opacity: 0; }\n    }\n    .${ANIMATION_NAME}-box {\n      position: fixed;\n      pointer-events: none;\n      box-sizing: border-box;\n      border-radius: 3px;\n      opacity: 0;\n      will-change: opacity;\n    }\n    .${ANIMATION_NAME}-label {\n      position: absolute;\n      top: -18px;\n      left: -1px;\n      font: 10px/16px ui-monospace, SFMono-Regular, \"SF Mono\", Menlo, Consolas, monospace;\n      padding: 0 4px;\n      color: #fff;\n      border-radius: 2px 2px 0 0;\n      white-space: nowrap;\n      pointer-events: none;\n    }\n  `;\n  win.document.head.appendChild(style);\n}\n\n// ────────────────────────────────────────────\n// Overlay root container\n// ────────────────────────────────────────────\n\nconst overlayRoots = new WeakMap<Window, HTMLDivElement>();\n\nfunction getOverlayRoot(win: Window): HTMLDivElement | null {\n  if (win.closed) return null;\n\n  const existing = overlayRoots.get(win);\n  if (existing?.isConnected) return existing;\n\n  ensureStylesheet(win);\n\n  const root = win.document.createElement(\"div\");\n  root.id = \"__react-debug-updates\";\n  Object.assign(root.style, {\n    position: \"fixed\",\n    top: \"0\",\n    left: \"0\",\n    width: \"0\",\n    height: \"0\",\n    overflow: \"visible\",\n    pointerEvents: \"none\",\n    zIndex: \"2147483647\",\n  } satisfies Partial<CSSStyleDeclaration>);\n  win.document.body.appendChild(root);\n\n  overlayRoots.set(win, root);\n  return root;\n}\n\n// ────────────────────────────────────────────\n// Element pool\n// ────────────────────────────────────────────\n\nconst pools = new WeakMap<Window, HTMLDivElement[]>();\n\nexport function acquireOverlay(win: Window): HTMLDivElement | null {\n  const root = getOverlayRoot(win);\n  if (!root) return null;\n\n  let pool = pools.get(win);\n  if (!pool) {\n    pool = [];\n    pools.set(win, pool);\n  }\n\n  const document = win.document;\n  let element = pool.pop();\n\n  if (!element) {\n    element = document.createElement(\"div\");\n    element.className = `${ANIMATION_NAME}-box`;\n\n    const label = document.createElement(\"span\");\n    label.className = `${ANIMATION_NAME}-label`;\n    element.appendChild(label);\n\n    element.addEventListener(\"animationend\", () => {\n      element!.style.animation = \"none\";\n      element!.remove();\n      pool!.push(element!);\n    });\n  }\n\n  root.appendChild(element);\n  return element;\n}\n\nexport function disposeAllOverlays() {\n  const mainRoot = overlayRoots.get(window);\n  mainRoot?.remove();\n  overlayRoots.delete(window);\n  pools.delete(window);\n}\n\nexport const OVERLAY_ANIMATION_NAME = ANIMATION_NAME;\n","import type { HighlightOptions, PendingEntry } from \"./types.js\";\nimport { formatCausesShort } from \"./format.js\";\nimport { acquireOverlay, OVERLAY_ANIMATION_NAME } from \"./overlay.js\";\n\n// ────────────────────────────────────────────\n// Heat color\n// ────────────────────────────────────────────\n\nfunction heatColor(count: number, alpha: number): string {\n  const normalizedCount = Math.min((count - 1) / 7, 1);\n  const hue = 200 - normalizedCount * 200;\n  const saturation = 85 + normalizedCount * 15;\n  const lightness = 55 - normalizedCount * 10;\n  return `hsla(${hue}, ${saturation}%, ${lightness}%, ${alpha})`;\n}\n\n// ────────────────────────────────────────────\n// Batched flush\n// ────────────────────────────────────────────\n//\n// Commit path just pushes lightweight refs (no DOM reads, no formatting).\n// Flush (setInterval): batched rect reads → batched DOM writes.\n\nexport const HIGHLIGHT_DEFAULTS: Required<HighlightOptions> = {\n  flushInterval: 250,\n  animationDuration: 1200,\n  showLabels: true,\n  opacity: 0.3,\n};\n\ninterface CoalescedEntry {\n  count: number;\n  totalDuration: number;\n  component: string;\n  /** Shallowest fiber depth among coalesced entries (for z-ordering). */\n  depth: number;\n  domNode: HTMLElement;\n  ownerWindow: Window;\n  causeSummary: string;\n}\n\nexport function createBatcher(options: Required<HighlightOptions>) {\n  let pending: PendingEntry[] = [];\n  let timer: ReturnType<typeof setInterval> | null = null;\n\n  function flush() {\n    if (pending.length === 0) return;\n\n    const batch = pending;\n    pending = [];\n\n    // Coalesce by DOM node identity\n    const map = new Map<HTMLElement, CoalescedEntry>();\n\n    for (let i = 0; i < batch.length; i++) {\n      const entry = batch[i];\n      if (!entry.domNode) continue;\n\n      const existing = map.get(entry.domNode);\n      if (existing) {\n        existing.count++;\n        existing.totalDuration += entry.duration;\n        existing.depth = Math.min(existing.depth, entry.depth);\n      } else {\n        const win = entry.domNode.ownerDocument?.defaultView;\n        if (!win || win.closed) continue;\n        map.set(entry.domNode, {\n          count: 1,\n          totalDuration: entry.duration,\n          component: entry.component,\n          depth: entry.depth,\n          domNode: entry.domNode,\n          ownerWindow: win,\n          causeSummary: formatCausesShort(entry.causes),\n        });\n      }\n    }\n\n    // Read phase: batch all rect reads\n    const toShow: Array<{ coalesced: CoalescedEntry; rect: DOMRect }> = [];\n    for (const coalesced of map.values()) {\n      const rect = coalesced.domNode.getBoundingClientRect();\n      if (rect.width > 0 || rect.height > 0) {\n        toShow.push({ coalesced, rect });\n      }\n    }\n\n    // Sort deepest first so parents are appended last (render on top)\n    toShow.sort((a, b) => b.coalesced.depth - a.coalesced.depth);\n\n    // Write phase: position overlays\n    for (let i = 0; i < toShow.length; i++) {\n      const { coalesced, rect } = toShow[i];\n      const element = acquireOverlay(coalesced.ownerWindow);\n      if (!element) continue;\n\n      const fillColor = heatColor(coalesced.count, 0.18);\n      const borderColor = heatColor(coalesced.count, 0.75);\n      const labelBackground = heatColor(coalesced.count, 0.9);\n\n      const style = element.style;\n      style.top = `${rect.top}px`;\n      style.left = `${rect.left}px`;\n      style.width = `${rect.width}px`;\n      style.height = `${rect.height}px`;\n      style.backgroundColor = fillColor;\n      style.border = `1.5px solid ${borderColor}`;\n      style.setProperty(\"--rdu-opacity\", String(options.opacity));\n      style.animation = `${OVERLAY_ANIMATION_NAME} ${options.animationDuration}ms ease-out forwards`;\n\n      const label = element.firstElementChild as HTMLElement;\n      if (options.showLabels) {\n        const countText = coalesced.count > 1 ? ` ×${coalesced.count}` : \"\";\n        const durationText =\n          coalesced.totalDuration > 0\n            ? ` ${coalesced.totalDuration.toFixed(1)}ms`\n            : \"\";\n        const causeText = coalesced.causeSummary\n          ? ` (${coalesced.causeSummary})`\n          : \"\";\n        label.textContent = `${coalesced.component}${countText}${durationText}${causeText}`;\n        label.style.backgroundColor = labelBackground;\n      } else {\n        label.textContent = \"\";\n        label.style.backgroundColor = \"transparent\";\n      }\n    }\n  }\n\n  function push(entry: PendingEntry) {\n    pending.push(entry);\n    if (!timer) {\n      timer = setInterval(flush, options.flushInterval);\n    }\n  }\n\n  function dispose() {\n    if (timer) {\n      clearInterval(timer);\n      timer = null;\n    }\n    pending = [];\n  }\n\n  return { push, dispose };\n}\n","import type {\n  DevToolsHook,\n  FiberRoot,\n  LoggerOptions,\n  PendingEntry,\n  RenderEntry,\n  RenderLogger,\n} from \"./types.js\";\nimport {\n  detectRenders,\n  findNearestDOMNode,\n  getComponentName,\n  getFiberPath,\n} from \"./fiber.js\";\nimport { detectCauses } from \"./causes.js\";\nimport { logRerendersToConsole } from \"./format.js\";\nimport { HIGHLIGHT_DEFAULTS, createBatcher } from \"./batcher.js\";\nimport { disposeAllOverlays } from \"./overlay.js\";\n\n/**\n * Attach a render logger to React's DevTools hook.\n *\n * Hooks into `__REACT_DEVTOOLS_GLOBAL_HOOK__.onCommitFiberRoot` to intercept\n * every React commit. Records re-render entries, optionally logs them to the\n * console, and optionally shows visual highlight overlays on re-rendered DOM nodes.\n *\n * Returns a `RenderLogger` handle, or `null` if the DevTools hook is not found.\n */\nexport function attachRenderLogger(\n  options: LoggerOptions = {},\n): RenderLogger | null {\n  const {\n    silent = false,\n    bufferSize = 500,\n    filter,\n    highlight = false,\n    mode = \"self-triggered\",\n    showCauses = false,\n  } = options;\n\n  const hook = (\n    window as unknown as { __REACT_DEVTOOLS_GLOBAL_HOOK__?: DevToolsHook }\n  ).__REACT_DEVTOOLS_GLOBAL_HOOK__;\n\n  if (!hook) {\n    console.warn(\n      \"[react-debug-updates] __REACT_DEVTOOLS_GLOBAL_HOOK__ not found. \" +\n        \"Make sure React DevTools or a dev build of React is active.\",\n    );\n    return null;\n  }\n\n  const highlightOptions = highlight\n    ? {\n        ...HIGHLIGHT_DEFAULTS,\n        ...(typeof highlight === \"object\" ? highlight : {}),\n      }\n    : null;\n\n  const batcher = highlightOptions ? createBatcher(highlightOptions) : null;\n\n  const entries: RenderEntry[] = [];\n  const previousOnCommit = hook.onCommitFiberRoot.bind(hook);\n\n  hook.onCommitFiberRoot = (\n    rendererID: number,\n    root: FiberRoot,\n    priorityLevel?: unknown,\n  ) => {\n    previousOnCommit(rendererID, root, priorityLevel);\n\n    // 1. Detect which component fibers actually re-rendered (pure fiber analysis)\n    const detectedRenders = detectRenders(root.current, mode);\n    if (detectedRenders.length === 0) return;\n\n    // 2. Build full entries: resolve names, DOM nodes, causes\n    const pendingEntries: PendingEntry[] = [];\n\n    for (let i = 0; i < detectedRenders.length; i++) {\n      const { fiber, depth } = detectedRenders[i];\n      const name = getComponentName(fiber);\n      if (!name) continue;\n\n      const pendingEntry: PendingEntry = {\n        component: name,\n        path: getFiberPath(fiber),\n        duration: fiber.actualDuration ?? 0,\n        depth,\n        domNode: findNearestDOMNode(fiber),\n        causes: showCauses ? detectCauses(fiber) : [],\n      };\n\n      const renderEntry: RenderEntry = {\n        component: pendingEntry.component,\n        path: pendingEntry.path,\n        duration: pendingEntry.duration,\n        timestamp: performance.now(),\n        causes: pendingEntry.causes,\n      };\n\n      if (filter && !filter(renderEntry)) continue;\n\n      if (entries.length >= bufferSize) entries.shift();\n      entries.push(renderEntry);\n\n      pendingEntries.push(pendingEntry);\n      batcher?.push(pendingEntry);\n    }\n\n    // 3. Console output\n    if (!silent) {\n      logRerendersToConsole(pendingEntries, showCauses);\n    }\n  };\n\n  const disconnect = () => {\n    hook.onCommitFiberRoot = previousOnCommit;\n    batcher?.dispose();\n    disposeAllOverlays();\n  };\n\n  if (!silent) {\n    console.log(\n      \"%c⚛ react-debug-updates attached\",\n      \"color: #61dafb; font-weight: bold\",\n    );\n  }\n\n  return { entries, disconnect 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dist/types.d.ts

@@ -40,2 +40,7 @@ export interface Fiber {
 }
+/** A component fiber that was detected as re-rendered during a commit. */
+export interface DetectedRender {
+    fiber: Fiber;
+    depth: number;
+}
 export interface PendingEntry {
@@ -42,0 +47,0 @@ component: string;

package.json

 {
   "name": "react-debug-updates",
-  "version": "0.1.6",
+  "version": "0.1.7",
   "description": "See why React components re-render — visual overlays, console logging, and hook-level cause detection with zero code changes",
@@ -5,0 +5,0 @@ "type": "module",

No alert changes

Improved metrics

Total package byte prevSize

123393

2.2%

Lines of code

1116

1.92%

No dependency changes