From ae3444675fdfd32addf7bbbaa17425536dce2dc7 Mon Sep 17 00:00:00 2001
From: Joe Savona <joesavona@fb.com>
Date: Thu, 2 Oct 2025 09:53:51 -0700
Subject: [PATCH] [compiler] `@enablePreserveExistingMemoizationGuarantees` on
 by default
MIME-Version: 1.0
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This enables `@enablePreserveExistingMemoizationGuarantees` by default. As of the previous PR (#34503), this mode now enables the following behaviors:

- Treating variables referenced within a `useMemo()` or `useCallback()` as "frozen" (immutable) as of the start of the call. Ie, the compiler will assume that the values you reference are not mutated by the body of the useMemo, not are they mutated later. Directly modifying them (eg `var.property = true`) will be an error.
- Similarly, the results of the useMemo/useCallback are treated as frozen (immutable) after the call.

These two rules match the behavior for other hooks: this means that developers will see similar behavior to swapping out `useMemo()` for a custom `useMyMemo()` wrapper/alias.

Additionally, as of #34503 the compiler uses information from the manual dependencies to know which variables are non-nullable. Even if a useMemo block conditionally accesses a nested property — `if (cond) { log(x.y.z) }` — where the compiler would not usually know that `x` is non-nullable, if the user specifies `x.y.z` as a manual dependency then the compiler knows that `x` and `x.y` are non-nullable and can infer a more precise dependency.

Finally, this mode also ensures that we always memoize function calls that return primitives. See #34343 for more details.

For now, I've explicitly opted out of this feature in all test fixtures where the behavior changed.
---
 .../babel-plugin-react-compiler/src/HIR/Environment.ts        | 2 +-
 .../fixtures/compiler/allocating-primitive-as-dep.expect.md   | 4 +++-
 .../fixtures/compiler/allocating-primitive-as-dep.js          | 1 +
 .../compiler/allow-modify-global-in-callback-jsx.expect.md    | 3 ++-
 .../fixtures/compiler/allow-modify-global-in-callback-jsx.js  | 1 +
 .../compiler/computed-load-primitive-as-dependency.expect.md  | 3 ++-
 .../compiler/computed-load-primitive-as-dependency.js         | 1 +
 .../compiler/constant-propagation-template-literal.expect.md  | 3 ++-
 .../compiler/constant-propagation-template-literal.js         | 1 +
 .../compiler/context-variable-as-jsx-element-tag.expect.md    | 3 ++-
 .../fixtures/compiler/context-variable-as-jsx-element-tag.js  | 1 +
 .../compiler/destructure-direct-reassignment.expect.md        | 2 ++
 .../fixtures/compiler/destructure-direct-reassignment.js      | 1 +
 ...ing-mutable-values-memoizes-with-captures-values.expect.md | 2 +-
 ...-capturing-mutable-values-memoizes-with-captures-values.js | 2 +-
 ...ured-value-mistaken-as-dependency-later-mutation.expect.md | 2 +-
 ...estructured-value-mistaken-as-dependency-later-mutation.js | 2 +-
 ...uctured-value-mistaken-as-dependency-mutated-dep.expect.md | 2 +-
 ...r-destructured-value-mistaken-as-dependency-mutated-dep.js | 2 +-
 ...capture-in-invoked-function-inferred-as-mutation.expect.md | 2 +-
 ...n-from-capture-in-invoked-function-inferred-as-mutation.js | 2 +-
 ...sed-memoization-from-inferred-mutation-in-logger.expect.md | 2 +-
 ...pro-missed-memoization-from-inferred-mutation-in-logger.js | 2 +-
 ...unmemoized-callback-captured-in-context-variable.expect.md | 2 +-
 ...repro-unmemoized-callback-captured-in-context-variable.tsx | 2 +-
 .../compiler/error.validate-object-entries-mutation.expect.md | 2 +-
 .../compiler/error.validate-object-entries-mutation.js        | 2 +-
 .../compiler/error.validate-object-values-mutation.expect.md  | 2 +-
 .../compiler/error.validate-object-values-mutation.js         | 2 +-
 .../compiler/existing-variables-with-c-name.expect.md         | 3 ++-
 .../fixtures/compiler/existing-variables-with-c-name.js       | 1 +
 .../fbt/bug-fbt-plural-multiple-function-calls.expect.md      | 3 ++-
 .../compiler/fbt/bug-fbt-plural-multiple-function-calls.ts    | 1 +
 .../compiler/for-in-statement-type-inference.expect.md        | 2 ++
 .../fixtures/compiler/for-in-statement-type-inference.js      | 1 +
 .../__tests__/fixtures/compiler/hooks-with-prefix.expect.md   | 4 ++--
 .../src/__tests__/fixtures/compiler/hooks-with-prefix.js      | 2 +-
 .../fixtures/compiler/infer-computed-delete.expect.md         | 4 ++--
 .../src/__tests__/fixtures/compiler/infer-computed-delete.js  | 2 +-
 .../fixtures/compiler/infer-property-delete.expect.md         | 2 ++
 .../src/__tests__/fixtures/compiler/infer-property-delete.js  | 1 +
 ....invalid-useCallback-captures-reassigned-context.expect.md | 2 +-
 .../error.invalid-useCallback-captures-reassigned-context.js  | 2 +-
 .../mutate-through-identity-function-expression.expect.md     | 3 ++-
 .../mutate-through-identity-function-expression.js            | 1 +
 .../compiler/new-mutability/mutate-through-identity.expect.md | 3 ++-
 .../compiler/new-mutability/mutate-through-identity.js        | 1 +
 .../todo-control-flow-sensitive-mutation.expect.md            | 3 ++-
 .../new-mutability/todo-control-flow-sensitive-mutation.tsx   | 1 +
 .../todo-transitivity-createfrom-capture-lambda.expect.md     | 3 ++-
 .../todo-transitivity-createfrom-capture-lambda.tsx           | 1 +
 .../transitivity-add-captured-array-to-itself.expect.md       | 3 ++-
 .../transitivity-add-captured-array-to-itself.tsx             | 1 +
 .../transitivity-capture-createfrom-lambda.expect.md          | 3 ++-
 .../new-mutability/transitivity-capture-createfrom-lambda.tsx | 1 +
 .../new-mutability/transitivity-capture-createfrom.expect.md  | 3 ++-
 .../new-mutability/transitivity-capture-createfrom.tsx        | 1 +
 .../transitivity-phi-assign-or-capture.expect.md              | 3 ++-
 .../new-mutability/transitivity-phi-assign-or-capture.tsx     | 1 +
 .../useCallback-reordering-deplist-controlflow.expect.md      | 4 ++--
 .../useCallback-reordering-deplist-controlflow.tsx            | 2 +-
 .../useCallback-reordering-depslist-assignment.expect.md      | 4 ++--
 .../useCallback-reordering-depslist-assignment.tsx            | 2 +-
 .../useMemo-reordering-depslist-assignment.expect.md          | 4 ++--
 .../new-mutability/useMemo-reordering-depslist-assignment.ts  | 2 +-
 .../error.false-positive-useMemo-infer-mutate-deps.expect.md  | 2 +-
 .../error.false-positive-useMemo-infer-mutate-deps.ts         | 2 +-
 ...r.hoist-useCallback-conditional-access-own-scope.expect.md | 2 +-
 .../error.hoist-useCallback-conditional-access-own-scope.ts   | 2 +-
 ....hoist-useCallback-infer-conditional-value-block.expect.md | 2 +-
 .../error.hoist-useCallback-infer-conditional-value-block.ts  | 2 +-
 ....invalid-useCallback-captures-reassigned-context.expect.md | 2 +-
 .../error.invalid-useCallback-captures-reassigned-context.ts  | 2 +-
 .../error.useCallback-conditional-access-noAlloc.expect.md    | 2 +-
 .../error.useCallback-conditional-access-noAlloc.ts           | 2 +-
 ...eCallback-infer-less-specific-conditional-access.expect.md | 2 +-
 ...rror.useCallback-infer-less-specific-conditional-access.ts | 2 +-
 ...r.useMemo-infer-less-specific-conditional-access.expect.md | 2 +-
 .../error.useMemo-infer-less-specific-conditional-access.ts   | 2 +-
 ...Memo-infer-less-specific-conditional-value-block.expect.md | 2 +-
 ...ror.useMemo-infer-less-specific-conditional-value-block.ts | 2 +-
 .../useCallback-reordering-deplist-controlflow.expect.md      | 3 ++-
 .../useCallback-reordering-deplist-controlflow.tsx            | 1 +
 .../useCallback-reordering-depslist-assignment.expect.md      | 3 ++-
 .../useCallback-reordering-depslist-assignment.tsx            | 1 +
 .../useMemo-reordering-depslist-assignment.expect.md          | 3 ++-
 .../useMemo-reordering-depslist-assignment.ts                 | 1 +
 .../useMemo-reordering-depslist-controlflow.expect.md         | 3 ++-
 .../useMemo-reordering-depslist-controlflow.tsx               | 1 +
 ...declarations-in-reactive-scope-with-early-return.expect.md | 4 ++--
 ...pro-no-declarations-in-reactive-scope-with-early-return.js | 2 +-
 .../compiler/repro-renaming-conflicting-decls.expect.md       | 3 ++-
 .../fixtures/compiler/repro-renaming-conflicting-decls.js     | 1 +
 .../compiler/ts-non-null-expression-default-value.expect.md   | 3 ++-
 .../compiler/ts-non-null-expression-default-value.tsx         | 1 +
 .../src/__tests__/fixtures/compiler/unary-expr.expect.md      | 3 ++-
 .../src/__tests__/fixtures/compiler/unary-expr.js             | 1 +
 .../fixtures/compiler/useMemo-named-function.expect.md        | 4 ++--
 .../src/__tests__/fixtures/compiler/useMemo-named-function.ts | 2 +-
 .../fixtures/compiler/useMemo-with-optional.expect.md         | 3 ++-
 .../src/__tests__/fixtures/compiler/useMemo-with-optional.js  | 1 +
 .../fixtures/compiler/while-with-assignment-in-test.expect.md | 2 ++
 .../fixtures/compiler/while-with-assignment-in-test.js        | 1 +
 103 files changed, 138 insertions(+), 79 deletions(-)

diff --git a/compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts b/compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts
index 57567f325fd9..9fa88680ca2e 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/HIR/Environment.ts
@@ -210,7 +210,7 @@ export const EnvironmentConfigSchema = z.object({
    * that if a useEffect or useCallback references a function value, that function value will be
    * considered frozen, and in turn all of its referenced variables will be considered frozen as well.
    */
-  enablePreserveExistingMemoizationGuarantees: z.boolean().default(false),
+  enablePreserveExistingMemoizationGuarantees: z.boolean().default(true),
 
   /**
    * Validates that all useMemo/useCallback values are also memoized by Forget. This mode can be
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.expect.md
index 3f1f7b3222a3..293d9964cc44 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 // bar(props.b) is an allocating expression that produces a primitive, which means
 // that Forget should memoize it.
 // Correctness:
@@ -16,7 +17,8 @@ function AllocatingPrimitiveAsDep(props) {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // bar(props.b) is an allocating expression that produces a primitive, which means
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
+// bar(props.b) is an allocating expression that produces a primitive, which means
 // that Forget should memoize it.
 // Correctness:
 //   - y depends on either bar(props.b) or bar(props.b) + 1
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.js
index c7ef86f7c222..3c0768e7f511 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allocating-primitive-as-dep.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 // bar(props.b) is an allocating expression that produces a primitive, which means
 // that Forget should memoize it.
 // Correctness:
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.expect.md
index 44d4974f6f88..e9475a070b88 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 const someGlobal = {value: 0};
@@ -32,7 +33,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 
 const someGlobal = { value: 0 };
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.js
index 8d89c65f2629..5bdeeaee1a8e 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/allow-modify-global-in-callback-jsx.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 const someGlobal = {value: 0};
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.expect.md
index 6adc3056080e..9f147194da1c 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   let a = foo();
   // freeze `a` so we know the next line cannot mutate it
@@ -17,7 +18,7 @@ function Component(props) {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const $ = _c(2);
   const a = foo();
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.js
index e6d2c795c378..29d6797fdd40 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/computed-load-primitive-as-dependency.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   let a = foo();
   // freeze `a` so we know the next line cannot mutate it
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.expect.md
index 6f13b0cd489d..06a7ee3a37f0 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {Stringify, identity} from 'shared-runtime';
 
 function foo() {
@@ -64,7 +65,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { Stringify, identity } from "shared-runtime";
 
 function foo() {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.js
index 656a54db5c71..199284b8caa9 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/constant-propagation-template-literal.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {Stringify, identity} from 'shared-runtime';
 
 function foo() {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.expect.md
index 5b8824eca6b6..407fdcb0488f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -25,7 +26,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.js
index a365800e3ed9..5ed1a9157bdf 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/context-variable-as-jsx-element-tag.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.expect.md
index c5167994cffc..3b2768d350a6 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function foo(props) {
   let x, y;
   ({x, y} = {x: props.a, y: props.b});
@@ -21,6 +22,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function foo(props) {
   let x;
   let y;
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.js
index 4e017cf2f777..ec10d66f26d2 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/destructure-direct-reassignment.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 function foo(props) {
   let x, y;
   ({x, y} = {x: props.a, y: props.b});
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.expect.md
index 8fe4602c8999..8592ae65e4b8 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @flow @enableNewMutationAliasingModel
+// @flow @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 /**
  * This hook returns a function that when called with an input object,
  * will return the result of mapping that input with the supplied map
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.js
index accabed80fc4..0fda92c726cb 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.invalid-uncalled-function-capturing-mutable-values-memoizes-with-captures-values.js
@@ -1,4 +1,4 @@
-// @flow @enableNewMutationAliasingModel
+// @flow @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 /**
  * This hook returns a function that when called with an input object,
  * will return the result of mapping that input with the supplied map
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.expect.md
index d8223e294983..8d603c629b6c 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 /**
  * Repro from https://github.com/facebook/react/issues/34262
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.js
index f07d00854cd8..086cda353e5f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-later-mutation.js
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 /**
  * Repro from https://github.com/facebook/react/issues/34262
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.expect.md
index 371348a56064..25b11eb38c24 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 import {identity, Stringify, useHook} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.js
index 06d2945868dd..7af080b072f3 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.repro-preserve-memoization-inner-destructured-value-mistaken-as-dependency-mutated-dep.js
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 import {identity, Stringify, useHook} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.expect.md
index 946dd33fcbf6..fc00a96a9f37 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @flow @validatePreserveExistingMemoizationGuarantees
+// @flow @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {logValue, useFragment, useHook, typedLog} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.js
index 1621ab41c905..f3d08397770a 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-capture-in-invoked-function-inferred-as-mutation.js
@@ -1,4 +1,4 @@
-// @flow @validatePreserveExistingMemoizationGuarantees
+// @flow @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {logValue, useFragment, useHook, typedLog} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.expect.md
index 46c473a1b5e7..be31341d15d2 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @flow @validatePreserveExistingMemoizationGuarantees
+// @flow @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useFragment} from 'react-relay';
 import LogEvent from 'LogEvent';
 import {useCallback, useMemo} from 'react';
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.js
index 34a9a1288218..c71723f4964f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-missed-memoization-from-inferred-mutation-in-logger.js
@@ -1,4 +1,4 @@
-// @flow @validatePreserveExistingMemoizationGuarantees
+// @flow @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useFragment} from 'react-relay';
 import LogEvent from 'LogEvent';
 import {useCallback, useMemo} from 'react';
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.expect.md
index 11ef34621c49..4721e015b08b 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {ValidateMemoization, useHook} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.tsx
index b17a5a4f6a56..0b90cf45bc53 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.todo-repro-unmemoized-callback-captured-in-context-variable.tsx
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {ValidateMemoization, useHook} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.expect.md
index 76b8d466ed4e..c7e16b3c12ba 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {makeObject_Primitives, Stringify} from 'shared-runtime';
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.js
index b4145b1617f8..b3a240a111c2 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-entries-mutation.js
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {makeObject_Primitives, Stringify} from 'shared-runtime';
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.expect.md
index fe532231896e..bee5b18b7e24 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {makeObject_Primitives, Stringify} from 'shared-runtime';
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.js
index 3482887d9207..4f8c32367c19 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/error.validate-object-values-mutation.js
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {makeObject_Primitives, Stringify} from 'shared-runtime';
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.expect.md
index 9f340f19ab96..0ead4d68f582 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo, useState} from 'react';
 import {ValidateMemoization} from 'shared-runtime';
 
@@ -28,7 +29,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c2 } from "react/compiler-runtime";
+import { c as _c2 } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo, useState } from "react";
 import { ValidateMemoization } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.js
index 96a8017848dd..16af7ef85d15 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/existing-variables-with-c-name.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo, useState} from 'react';
 import {ValidateMemoization} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.expect.md
index 650d828bd258..f4a416a50365 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import fbt from 'fbt';
 
 /**
@@ -35,7 +36,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import fbt from "fbt";
 
 /**
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.ts
index 20b14c5c5071..4ce2caadb9a9 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/fbt/bug-fbt-plural-multiple-function-calls.ts
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import fbt from 'fbt';
 
 /**
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.expect.md
index 387c033d98dc..686d95a6f504 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 const {identity, mutate} = require('shared-runtime');
 
 function Component(props) {
@@ -24,6 +25,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 const { identity, mutate } = require("shared-runtime");
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.js
index 6dbdbac59c5e..027d1e7f41ee 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/for-in-statement-type-inference.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 const {identity, mutate} = require('shared-runtime');
 
 function Component(props) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.expect.md
index 6b95dda4739e..c7fcfd1daaef 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @hookPattern:".*\b(use[^$]+)$"
+// @hookPattern:".*\b(use[^$]+)$" @enablePreserveExistingMemoizationGuarantees:false
 
 import * as React from 'react';
 import {makeArray, useHook} from 'shared-runtime';
@@ -36,7 +36,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @hookPattern:".*\b(use[^$]+)$"
+import { c as _c } from "react/compiler-runtime"; // @hookPattern:".*\b(use[^$]+)$" @enablePreserveExistingMemoizationGuarantees:false
 
 import * as React from "react";
 import { makeArray, useHook } from "shared-runtime";
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.js
index 246a74db72fd..4db8451bc855 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/hooks-with-prefix.js
@@ -1,4 +1,4 @@
-// @hookPattern:".*\b(use[^$]+)$"
+// @hookPattern:".*\b(use[^$]+)$" @enablePreserveExistingMemoizationGuarantees:false
 
 import * as React from 'react';
 import {makeArray, useHook} from 'shared-runtime';
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.expect.md
index 258371afec83..cd93ad9bf7a3 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @debug
+// @debug @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x[props.value];
@@ -14,7 +14,7 @@ function Component(props) {
 ## Code
 
 ```javascript
-// @debug
+// @debug @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x[props.value];
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.js
index 187e797f40f8..6229cb6d3e5a 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-computed-delete.js
@@ -1,4 +1,4 @@
-// @debug
+// @debug @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x[props.value];
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.expect.md
index 4f1fb2d49299..f8e74b37dda2 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x.value;
@@ -13,6 +14,7 @@ function Component(props) {
 ## Code
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x.value;
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.js
index b8540044449b..1dd4bd710e03 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/infer-property-delete.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component(props) {
   const x = makeObject();
   const y = delete x.value;
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.expect.md
index a6d7eb64e10a..f3ebad71dfca 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees @enableNewMutationAliasingModel
+// @validatePreserveExistingMemoizationGuarantees @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {makeArray} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.js
index b9b914d30ec9..d084df5e7a19 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/error.invalid-useCallback-captures-reassigned-context.js
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees @enableNewMutationAliasingModel
+// @validatePreserveExistingMemoizationGuarantees @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {makeArray} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.expect.md
index 83e593dbd414..98128b1e506f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, ValidateMemoization} from 'shared-runtime';
 
@@ -32,7 +33,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import { identity, ValidateMemoization } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.js
index c7770ffcdce2..3190c0e7c7c4 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity-function-expression.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, ValidateMemoization} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.expect.md
index 78cb6697fc7a..012aec12b366 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, ValidateMemoization} from 'shared-runtime';
 
@@ -29,7 +30,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import { identity, ValidateMemoization } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.js
index bd928634a29b..a542514109ea 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/mutate-through-identity.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, ValidateMemoization} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.expect.md
index 0a31e02ae25e..53a99470a924 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   mutate,
@@ -49,7 +50,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   mutate,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.tsx
index 61f8c47e453d..5d61126ee978 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-control-flow-sensitive-mutation.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   mutate,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.expect.md
index c985809353e4..25f372852375 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
@@ -41,7 +42,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.tsx
index d6bd1690f655..c6bd016280d2 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/todo-transitivity-createfrom-capture-lambda.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.expect.md
index 4f665646241f..9cb71732a099 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
@@ -42,7 +43,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.tsx
index d81c069e336b..1e997906428f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-add-captured-array-to-itself.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.expect.md
index 2cffd06f07b7..81c53c901679 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
@@ -40,7 +41,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.tsx
index 72289eb83357..cb282549f068 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom-lambda.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.expect.md
index 458b75dff94a..a51aaf5367ce 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
@@ -36,7 +37,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.tsx
index d06ad11eb575..6d2f17853163 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-capture-createfrom.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.expect.md
index 0786bac4341f..fd7f2b0cda05 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
@@ -40,7 +41,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.tsx
index 90b759769460..03ca2ef583ae 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/transitivity-phi-assign-or-capture.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {
   typedCapture,
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.expect.md
index e33f52396d5e..6c45eb8bfaf8 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -36,7 +36,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel
+import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import { useCallback } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.tsx
index 08b9e4b2faa6..f360a8213259 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-deplist-controlflow.tsx
@@ -1,4 +1,4 @@
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.expect.md
index cc65670080b6..f29be3d405b4 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -31,7 +31,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel
+import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import { useCallback } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.tsx
index 43e2dfbb0504..061af52723e0 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useCallback-reordering-depslist-assignment.tsx
@@ -1,4 +1,4 @@
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.expect.md
index 926887a7a448..ce3e3734e98c 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 function useFoo(arr1, arr2) {
@@ -27,7 +27,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel
+import { c as _c } from "react/compiler-runtime"; // @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 
 function useFoo(arr1, arr2) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.ts
index 5b7d799d68b1..7c4daae371f1 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/new-mutability/useMemo-reordering-depslist-assignment.ts
@@ -1,4 +1,4 @@
-// @enableNewMutationAliasingModel
+// @enableNewMutationAliasingModel @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 function useFoo(arr1, arr2) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.expect.md
index a30b33d8b648..9a092e3f228e 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.ts
index 1d0ca7f1bc70..628c786550e1 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.false-positive-useMemo-infer-mutate-deps.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.expect.md
index eafc8f16cffd..ed2e61d8ee37 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 
 function Component({propA, propB}) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.ts
index 6c32f01b37da..a75a3936d4c0 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-conditional-access-own-scope.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 
 function Component({propA, propB}) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.expect.md
index 6298ab289c14..a16ef317b09a 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {identity, mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.ts
index d0c82f786630..23d77c84ec14 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.hoist-useCallback-infer-conditional-value-block.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {identity, mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.expect.md
index 082097cbd10f..df6ee0495e17 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 import {useCallback} from 'react';
 import {makeArray} from 'shared-runtime';
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.ts
index d7e77b77c260..29ff926d2e05 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.invalid-useCallback-captures-reassigned-context.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 
 import {useCallback} from 'react';
 import {makeArray} from 'shared-runtime';
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.expect.md
index 92b667de08b1..075458831b8d 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 
 function Component({propA, propB}) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.ts
index e5e53b8420ee..c6642be4f893 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-conditional-access-noAlloc.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 
 function Component({propA, propB}) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.expect.md
index c22a96d629f2..077b9aa9f6f5 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.ts
index fef4fdfa6805..637e0a974e6b 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useCallback-infer-less-specific-conditional-access.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.expect.md
index cf24f2592695..d93c52a10c12 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.ts
index ee09122d602f..9a81716828c3 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-access.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.expect.md
index fafaad14e648..9d35f52504e1 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.ts
index 1db0acf83985..7c9cb48c7c1f 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/error.useMemo-infer-less-specific-conditional-value-block.ts
@@ -1,4 +1,4 @@
-// @validatePreserveExistingMemoizationGuarantees
+// @validatePreserveExistingMemoizationGuarantees @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {identity, mutate} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.expect.md
index 18e0621d6266..db5ff86ed235 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -35,7 +36,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useCallback } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.tsx
index ba0abc0d7cdf..698fbeb2ca05 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-deplist-controlflow.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.expect.md
index 086ef4f58d6d..448c2133301a 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -30,7 +31,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useCallback } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.tsx
index 3ac3845c47f7..d5d36490dfbb 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useCallback-reordering-depslist-assignment.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useCallback} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.expect.md
index c224f1d17ec7..58b2c9762b29 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 function useFoo(arr1, arr2) {
@@ -26,7 +27,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 
 function useFoo(arr1, arr2) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.ts
index 8025d3680fb5..673380de119c 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-assignment.ts
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 
 function useFoo(arr1, arr2) {
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.expect.md
index d8a20367c917..d208ce4fb74d 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {Stringify} from 'shared-runtime';
 
@@ -35,7 +36,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import { Stringify } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.tsx
index c179d27b8312..eae6a75854e0 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/preserve-memo-validation/useMemo-reordering-depslist-controlflow.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {Stringify} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.expect.md
index d913c4f29b38..6cf8820e9844 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const items = useItems();
   const filteredItems = useMemo(
@@ -37,7 +37,7 @@ function Component() {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+import { c as _c } from "react/compiler-runtime"; // @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const $ = _c(6);
   const items = useItems();
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.js
index 1d01c2099395..aa43a8d18867 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-no-declarations-in-reactive-scope-with-early-return.js
@@ -1,4 +1,4 @@
-// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions
+// @enableAssumeHooksFollowRulesOfReact @enableTransitivelyFreezeFunctionExpressions @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const items = useItems();
   const filteredItems = useMemo(
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.expect.md
index 85d345fbf7dd..68dc127bc1e9 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {Stringify, identity, makeArray, toJSON} from 'shared-runtime';
 import {useMemo} from 'react';
 
@@ -40,7 +41,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { Stringify, identity, makeArray, toJSON } from "shared-runtime";
 import { useMemo } from "react";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.js
index 64135be731a2..139be81a6c3b 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/repro-renaming-conflicting-decls.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {Stringify, identity, makeArray, toJSON} from 'shared-runtime';
 import {useMemo} from 'react';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.expect.md
index 7af6bc996a99..4b8096f702a0 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 const THEME_MAP: ReadonlyMap<string, string> = new Map([
   ['default', 'light'],
   ['dark', 'dark'],
@@ -21,7 +22,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 const THEME_MAP: ReadonlyMap<string, string> = new Map([
   ["default", "light"],
   ["dark", "dark"],
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.tsx b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.tsx
index c1d835d6f0f0..43a24622c5ba 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.tsx
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/ts-non-null-expression-default-value.tsx
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 const THEME_MAP: ReadonlyMap<string, string> = new Map([
   ['default', 'light'],
   ['dark', 'dark'],
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.expect.md
index 7fa86838e8c2..399be048d550 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function component(a) {
   let t = {t: a};
   let z = +t.t;
@@ -25,7 +26,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 function component(a) {
   const $ = _c(8);
   const t = { t: a };
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.js
index c22b9208966e..a367653dfd9e 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/unary-expr.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 function component(a) {
   let t = {t: a};
   let z = +t.t;
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.expect.md
index 9c87512a0f7c..4d1cc124006c 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.expect.md
@@ -2,7 +2,7 @@
 ## Input
 
 ```javascript
-// @validateNoSetStateInRender:false
+// @validateNoSetStateInRender:false @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {makeArray} from 'shared-runtime';
 
@@ -21,7 +21,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime"; // @validateNoSetStateInRender:false
+import { c as _c } from "react/compiler-runtime"; // @validateNoSetStateInRender:false @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 import { makeArray } from "shared-runtime";
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.ts b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.ts
index 317491efbfe7..20a377c47497 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.ts
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-named-function.ts
@@ -1,4 +1,4 @@
-// @validateNoSetStateInRender:false
+// @validateNoSetStateInRender:false @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 import {makeArray} from 'shared-runtime';
 
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.expect.md
index 260d695e09d8..34529a210808 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 function Component(props) {
   return (
@@ -21,7 +22,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
-import { c as _c } from "react/compiler-runtime";
+import { c as _c } from "react/compiler-runtime"; // @enablePreserveExistingMemoizationGuarantees:false
 import { useMemo } from "react";
 function Component(props) {
   const $ = _c(2);
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.js
index a96c044a3b86..7df73db402f8 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/useMemo-with-optional.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 import {useMemo} from 'react';
 function Component(props) {
   return (
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.expect.md b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.expect.md
index 1edde1af1cea..033c7b0d98fb 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.expect.md
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.expect.md
@@ -2,6 +2,7 @@
 ## Input
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const queue = [1, 2, 3];
   let value = 0;
@@ -22,6 +23,7 @@ export const FIXTURE_ENTRYPOINT = {
 ## Code
 
 ```javascript
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const queue = [1, 2, 3];
   let value;
diff --git a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.js b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.js
index 295bf27d3fb9..3af11ed453ca 100644
--- a/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.js
+++ b/compiler/packages/babel-plugin-react-compiler/src/__tests__/fixtures/compiler/while-with-assignment-in-test.js
@@ -1,3 +1,4 @@
+// @enablePreserveExistingMemoizationGuarantees:false
 function Component() {
   const queue = [1, 2, 3];
   let value = 0;