fix(ink-compat): optimize translation and layout hot paths

packages/bench/src/io.ts

@@ -119,9 +119,8 @@ export async function createBenchBackend(): Promise<BenchFrameBackend> {
   }
 
   const NodeBackend = await import("@rezi-ui/node");
-  const executionModeEnv = (
-    process.env as Readonly<{ REZI_BENCH_REZI_EXECUTION_MODE?: string }>
-  ).REZI_BENCH_REZI_EXECUTION_MODE;
+  const executionModeEnv = (process.env as Readonly<{ REZI_BENCH_REZI_EXECUTION_MODE?: string }>)
+    .REZI_BENCH_REZI_EXECUTION_MODE;
   const executionMode = executionModeEnv === "worker" ? "worker" : "inline";
   const inner = NodeBackend.createNodeBackend({
     // PTY mode already runs in a dedicated process, so prefer inline execution

packages/bench/src/reziProfile.ts

@@ -63,4 +63,3 @@ export function emitReziPerfSnapshot(
     // Profiling is optional and must never affect benchmark execution.
   }
 }
-

packages/bench/src/scenarios/terminalVirtualList.ts

@@ -135,7 +135,13 @@ async function runRezi(
 
     metrics.framesProduced = backend.frameCount - frameBase;
     metrics.bytesProduced = backend.totalFrameBytes - bytesBase;
-    emitReziPerfSnapshot(core, "terminal-virtual-list", { items: totalItems, viewport }, config, metrics);
+    emitReziPerfSnapshot(
+      core,
+      "terminal-virtual-list",
+      { items: totalItems, viewport },
+      config,
+      metrics,
+    );
     return metrics;
   } finally {
     await app.stop();

packages/core/src/app/widgetRenderer/submitFramePipeline.ts

@@ -12,9 +12,8 @@ const HASH_FNV_PRIME = 0x01000193;
 const EMPTY_INSTANCE_IDS: readonly InstanceId[] = Object.freeze([]);
 const LAYOUT_SIG_INCLUDE_TEXT_WIDTH = (() => {
   try {
-    const raw = (
-      globalThis as { process?: { env?: { REZI_LAYOUT_SIG_TEXT_WIDTH?: string } } }
-    ).process?.env?.REZI_LAYOUT_SIG_TEXT_WIDTH;
+    const raw = (globalThis as { process?: { env?: { REZI_LAYOUT_SIG_TEXT_WIDTH?: string } } })
+      .process?.env?.REZI_LAYOUT_SIG_TEXT_WIDTH;
     // Default: treat plain (non-wrapped, unconstrained) text width changes as
     // paint-only, not layout-affecting. This avoids full relayout churn for
     // high-frequency text updates.

packages/core/src/renderer/__tests__/renderPackets.test.ts

@@ -229,11 +229,7 @@ describe("render packet retention", () => {
       firstKey,
       "key should remain stable when visual fields are unchanged despite new object identity",
     );
-    assert.equal(
-      root.renderPacket,
-      firstPacket,
-      "packet should be reused when key matches",
-    );
+    assert.equal(root.renderPacket, firstPacket, "packet should be reused when key matches");
   });
 
   test("packet invalidates when visual field changes", () => {

packages/core/src/renderer/renderToDrawlist/renderPackets.ts

@@ -116,7 +116,8 @@ function hashPropsShallow(hash: number, props: Readonly<Record<string, unknown>>
   const keys = Object.keys(props);
   out = mixHash(out, keys.length);
   for (let i = 0; i < keys.length; i++) {
-    const key = keys[i]!;
+    const key = keys[i];
+    if (key === undefined) continue;
     out = mixHash(out, hashString(key));
     out = hashPropValue(out, props[key]);
   }
@@ -250,12 +251,21 @@ function isTickDrivenKind(kind: RuntimeInstance["vnode"]["kind"]): boolean {
  * The text content itself is already hashed separately.
  */
 function hashTextProps(hash: number, props: Readonly<Record<string, unknown>>): number {
-  const style = props["style"];
-  const maxWidth = props["maxWidth"];
-  const wrap = props["wrap"];
-  const variant = props["variant"];
-  const dim = props["dim"];
-  const textOverflow = props["textOverflow"];
+  const textProps = props as Readonly<{
+    style?: unknown;
+    maxWidth?: unknown;
+    wrap?: unknown;
+    variant?: unknown;
+    dim?: unknown;
+    textOverflow?: unknown;
+  }>;
+
+  const style = textProps.style;
+  const maxWidth = textProps.maxWidth;
+  const wrap = textProps.wrap;
+  const variant = textProps.variant;
+  const dim = textProps.dim;
+  const textOverflow = textProps.textOverflow;
 
   // Common case for plain text nodes with no explicit props.
   if (

packages/ink-compat/src/__tests__/integration/basic.test.ts

@@ -577,6 +577,100 @@ test("runtime render resolves nested percent sizing from resolved parent layout"
   }
 });
 
+test("runtime render re-resolves percent sizing when parent layout changes (no frame lag)", async () => {
+  const stdin = new PassThrough() as PassThrough & { setRawMode: (enabled: boolean) => void };
+  stdin.setRawMode = () => {};
+
+  const stdout = new PassThrough() as PassThrough & {
+    columns?: number;
+    rows?: number;
+  };
+  stdout.columns = 80;
+  stdout.rows = 24;
+
+  const stderr = new PassThrough();
+
+  let parentNode: InkHostNode | null = null;
+  let childNode: InkHostNode | null = null;
+
+  function App(props: { parentWidth: number }): React.ReactElement {
+    const parentRef = React.useRef<InkHostNode | null>(null);
+    const childRef = React.useRef<InkHostNode | null>(null);
+
+    useEffect(() => {
+      parentNode = parentRef.current;
+      childNode = childRef.current;
+    });
+
+    return React.createElement(
+      Box,
+      { ref: parentRef, width: props.parentWidth, flexDirection: "row" },
+      React.createElement(
+        Box,
+        { ref: childRef, width: "50%" },
+        React.createElement(Text, null, "Child"),
+      ),
+    );
+  }
+
+  const instance = runtimeRender(React.createElement(App, { parentWidth: 20 }), {
+    stdin,
+    stdout,
+    stderr,
+  });
+  try {
+    await new Promise((resolve) => setTimeout(resolve, 60));
+    assert.ok(parentNode != null, "parent ref should be set");
+    assert.ok(childNode != null, "child ref should be set");
+    assert.equal(measureElement(parentNode).width, 20);
+    assert.equal(measureElement(childNode).width, 10);
+
+    instance.rerender(React.createElement(App, { parentWidth: 30 }));
+    await new Promise((resolve) => setTimeout(resolve, 60));
+    assert.equal(measureElement(parentNode).width, 30);
+    assert.equal(measureElement(childNode).width, 15);
+  } finally {
+    instance.unmount();
+    instance.cleanup();
+  }
+});
+
+test("runtime render layout generations hide stale layout for removed nodes", async () => {
+  const stdin = new PassThrough() as PassThrough & { setRawMode: (enabled: boolean) => void };
+  stdin.setRawMode = () => {};
+  const stdout = new PassThrough();
+  const stderr = new PassThrough();
+
+  let removedNode: InkHostNode | null = null;
+
+  function Before(): React.ReactElement {
+    const removedRef = React.useRef<InkHostNode | null>(null);
+    useEffect(() => {
+      removedNode = removedRef.current;
+    });
+    return React.createElement(
+      Box,
+      { ref: removedRef, width: 22 },
+      React.createElement(Text, null, "Before"),
+    );
+  }
+
+  const instance = runtimeRender(React.createElement(Before), { stdin, stdout, stderr });
+  try {
+    await new Promise((resolve) => setTimeout(resolve, 40));
+    assert.ok(removedNode != null, "removed node ref should be set");
+    assert.equal(measureElement(removedNode).width, 22);
+
+    instance.rerender(React.createElement(Text, null, "After"));
+    await new Promise((resolve) => setTimeout(resolve, 40));
+
+    assert.deepEqual(measureElement(removedNode), { width: 0, height: 0 });
+  } finally {
+    instance.unmount();
+    instance.cleanup();
+  }
+});
+
 test("render option isScreenReaderEnabled flows to hook context", async () => {
   const stdin = new PassThrough() as PassThrough & { setRawMode: (enabled: boolean) => void };
   stdin.setRawMode = () => {};
@@ -948,6 +1042,40 @@ test("rerender updates output", () => {
   assert.match(result.lastFrame(), /New/);
 });
 
+test("rendering identical tree keeps ANSI frame bytes stable", async () => {
+  const element = React.createElement(
+    Box,
+    { flexDirection: "row" },
+    React.createElement(Text, { color: "green", bold: true }, "Left"),
+    React.createElement(Text, null, " "),
+    React.createElement(Text, null, "\u001b[31mRight\u001b[0m"),
+  );
+
+  const captureFrame = async (): Promise<string> => {
+    const stdin = new PassThrough() as PassThrough & { setRawMode: (enabled: boolean) => void };
+    stdin.setRawMode = () => {};
+    const stdout = new PassThrough();
+    const stderr = new PassThrough();
+    let writes = "";
+    stdout.on("data", (chunk) => {
+      writes += chunk.toString("utf-8");
+    });
+
+    const instance = runtimeRender(element, { stdin, stdout, stderr });
+    try {
+      await new Promise((resolve) => setTimeout(resolve, 30));
+      return latestFrameFromWrites(writes);
+    } finally {
+      instance.unmount();
+      instance.cleanup();
+    }
+  };
+
+  const firstFrame = await captureFrame();
+  const secondFrame = await captureFrame();
+  assert.equal(secondFrame, firstFrame);
+});
+
 test("runtime Static emits only new items on rerender", async () => {
   interface Item {
     id: string;
@@ -1138,6 +1266,45 @@ test("ANSI output resets attributes between differently-styled cells", () => {
 
 // ─── Regression: text inherits background from underlying fillRect ───
 
+test("nested non-overlapping clips do not leak text", async () => {
+  const stdin = new PassThrough() as PassThrough & { setRawMode: (enabled: boolean) => void };
+  stdin.setRawMode = () => {};
+  const stdout = new PassThrough();
+  const stderr = new PassThrough();
+  let writes = "";
+  stdout.on("data", (chunk) => {
+    writes += chunk.toString("utf-8");
+  });
+
+  const instance = runtimeRender(
+    React.createElement(
+      Box,
+      { width: 4, height: 1, overflow: "hidden" },
+      React.createElement(
+        Box,
+        { position: "absolute", left: 10, top: 0, width: 4, height: 1, overflow: "hidden" },
+        React.createElement(Text, null, "LEAK"),
+      ),
+    ),
+    { stdin, stdout, stderr },
+  );
+
+  try {
+    await new Promise<void>((resolve) => {
+      if (writes.length > 0) {
+        resolve();
+        return;
+      }
+      stdout.once("data", () => resolve());
+    });
+    const latest = stripTerminalEscapes(latestFrameFromWrites(writes));
+    assert.equal(latest.includes("LEAK"), false, `unexpected clipped leak in output: ${latest}`);
+  } finally {
+    instance.unmount();
+    instance.cleanup();
+  }
+});
+
 test("text over backgroundColor box preserves box background in ANSI output", () => {
   const previousNoColor = process.env["NO_COLOR"];
   const previousForceColor = process.env["FORCE_COLOR"];