feat: improve stability by disabling React owner stacks

.changeset/smooth-baths-decide.md

@@ -0,0 +1,7 @@
+---
+"@callstack/reassure-measure": minor
+"reassure-test-app": minor
+"reassure": minor
+---
+
+feat: disable owner stacks to improve render duration stability

docusaurus/docs/api.md

@@ -19,6 +19,9 @@ Custom wrapper for the RNTL/RTL's `render` function responsible for rendering th
 measuring its performance and writing results to the output file. You can use optional `options` object allows customizing aspects
 of the testing.
 
+During render measurements, Reassure disables React owner-stack collection to reduce React test overhead and improve measurement stability.
+Set `RTC_SKIP_DISABLE_OWNER_STACKS` to any truthy value to skip this behavior and leave owner stacks enabled.
+
 ```ts
 async function measureRenders(
   ui: React.ReactElement,
@@ -234,6 +237,7 @@ The `reassure` CLI can be parametrized using available environmental variables:
 
 - `TEST_RUNNER_PATH`: an alternative path for your test runner. Defaults to `'node_modules/.bin/jest'` or on Windows `'node_modules/jest/bin/jest'`
 - `TEST_RUNNER_ARGS`: a set of arguments fed to the runner. Defaults to `'--runInBand --testMatch "**/__perf__/**/*.[jt]s?(x)", "**/*.(perf|perf-test).[jt]s?(x)"`
+- `RTC_SKIP_DISABLE_OWNER_STACKS`: set to any truthy value to skip disabling React owner-stack collection during render measurements
 
 Example:
 

packages/measure/package.json

@@ -53,7 +53,8 @@
   "dependencies": {
     "@callstack/reassure-logger": "1.5.1",
     "mathjs": "^15.2.0",
-    "pretty-format": "^30.4.1"
+    "pretty-format": "^30.4.1",
+    "react-test-config": "^0.3.0"
   },
   "devDependencies": {
     "@babel/core": "^7.29.7",

packages/measure/src/measure-renders.tsx

@@ -2,6 +2,7 @@ import * as React from 'react';
 import * as logger from '@callstack/reassure-logger';
 import { config } from './config';
 import { RunResult, processRunResults } from './measure-helpers';
+import { disableOwnerStacksIfNeeded } from './owner-stacks';
 import { showFlagsOutputIfNeeded, writeTestStats } from './output';
 import { applyRenderPolyfills, revertRenderPolyfills } from './polyfills';
 import { ElementJsonTree, detectRedundantUpdates } from './redundant-renders';
@@ -63,6 +64,7 @@ async function measureRendersInternal(
   const { render, cleanup } = resolveTestingLibrary();
   const testingLibrary = getTestingLibrary();
 
+  disableOwnerStacksIfNeeded();
   showFlagsOutputIfNeeded();
   applyRenderPolyfills();
 

packages/measure/src/owner-stacks.ts

@@ -0,0 +1,12 @@
+import { disableOwnerStacks } from 'react-test-config';
+
+let hasDisabledOwnerStacks = false;
+
+export function disableOwnerStacksIfNeeded() {
+  if (hasDisabledOwnerStacks) {
+    return;
+  }
+
+  disableOwnerStacks();
+  hasDisabledOwnerStacks = true;
+}

test-apps/native/jest-setup.js

@@ -1,9 +1,6 @@
 import { configure } from 'reassure';
-import { disableOwnerStacks } from 'react-test-config';
 
 configure({
   testingLibrary: 'react-native',
   verbose: true,
 });
-
-disableOwnerStacks();

test-apps/native/package.json

@@ -32,7 +32,6 @@
     "eslint-plugin-oxfmt": "^0.10.0",
     "jest": "^30.4.2",
     "oxfmt": "^0.54.0",
-    "react-test-config": "^0.3.0",
     "reassure": "workspace:^",
     "test-renderer": "1.2.0",
     "typescript": "^6.0.3"

yarn.lock

@@ -1666,6 +1666,7 @@ __metadata:
     react: "npm:19.2.3"
     react-native: "npm:0.85.3"
     react-native-builder-bob: "npm:^0.41.0"
+    react-test-config: "npm:^0.3.0"
     strip-ansi: "npm:^6.0.1"
     test-renderer: "npm:1.2.0"
     typescript: "npm:^6.0.3"
@@ -10582,7 +10583,6 @@ __metadata:
     oxfmt: "npm:^0.54.0"
     react: "npm:19.2.3"
     react-native: "npm:0.85.3"
-    react-test-config: "npm:^0.3.0"
     reassure: "workspace:^"
     test-renderer: "npm:1.2.0"
     typescript: "npm:^6.0.3"