n.a#1

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Merged
switz merged 3 commits into from
Mar 25, 2026
Merged

n.a #1

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c0c29e8
Fix typos in the documentation (#35439)
rahul24salunke Mar 24, 2026
3cb2c42
Add ReactFeatureFlags support to eprh (#35951)
jackpope Mar 25, 2026
c5362ec
TIM-471: Fizz internals analysis for fused renderer
switz Mar 25, 2026
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6 changes: 4 additions & 2 deletions .github/workflows/runtime_commit_artifacts.yml
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
run: |
sed -i -e 's/ @license React*//' \
build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
- name: Insert @headers into eslint plugin and react-refresh
run: |
sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
- name: Move relevant files for React in www into compiled
run: |
Expand All@@ -132,9 +134,9 @@ jobs:
mkdir ./compiled/facebook-www/__test_utils__
mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

# Copy eslint-plugin-react-hooks
# Copy eslint-plugin-react-hooks (www build with feature flags)
mkdir ./compiled/eslint-plugin-react-hooks
cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
./compiled/eslint-plugin-react-hooks/index.js

# Move unstable_server-external-runtime.js into facebook-www
Expand Down
2 changes: 1 addition & 1 deletion compiler/docs/DESIGN_GOALS.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down
6 changes: 3 additions & 3 deletions ...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
kind: 'Apply';
receiver: Place;
function: Place; // same as receiver for function calls
mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
args: Array<Place | SpreadPattern | Hole>;
into: Place; // where result is stored
signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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n.a#1

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 Merged

switz
merged 3 commits into

from

Mar 25, 2026
 Merged


n.a
#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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n.a#1

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 Merged

switz
merged 3 commits into

from

Mar 25, 2026
 Merged


n.a
#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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n.a#1

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 Merged

switz
merged 3 commits into

from

Mar 25, 2026
 Merged


n.a
#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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switz
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#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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n.a#1

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 Merged

switz
merged 3 commits into

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Mar 25, 2026
 Merged


n.a
#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
Loading
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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n.a#1

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 Merged

switz
merged 3 commits into

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Mar 25, 2026
 Merged


n.a
#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
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Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Mar 25, 2026
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#1
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c0c29e8

Fix typos in the documentation (#35439)


rahul24salunke Mar 24, 2026
3cb2c42

Add ReactFeatureFlags support to eprh (#35951)


jackpope Mar 25, 2026
c5362ec

TIM-471: Fizz internals analysis for fused renderer


switz Mar 25, 2026

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6 changes: 4 additions & 2 deletions
.github/workflows/runtime_commit_artifacts.yml

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -116,11 +116,13 @@ jobs:
 run: |
 sed -i -e 's/ @license React*//' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Insert @headers into eslint plugin and react-refresh
 run: |
 sed -i -e 's/ LICENSE file in the root directory of this source tree./ LICENSE file in the root directory of this source tree.\n *\n * @noformat\n * @nolint\n * @lightSyntaxTransform\n * @preventMunge\n * @oncall react_core/' \
 build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 build/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 build/oss-experimental/react-refresh/cjs/react-refresh-babel.development.js
 - name: Move relevant files for React in www into compiled
 run: |
Expand All@@ -132,9 +134,9 @@ jobs:
 mkdir ./compiled/facebook-www/__test_utils__
 mv build/__test_utils__/ReactAllWarnings.js ./compiled/facebook-www/__test_utils__/ReactAllWarnings.js

 # Copy eslint-plugin-react-hooks
 # Copy eslint-plugin-react-hooks (www build with feature flags)
 mkdir ./compiled/eslint-plugin-react-hooks
 cp build/oss-experimental/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
 cp ./compiled/facebook-www/ESLintPluginReactHooks-dev.modern.js \
 ./compiled/eslint-plugin-react-hooks/index.js

 # Move unstable_server-external-runtime.js into facebook-www
Expand Down

2 changes: 1 addition & 1 deletion
compiler/docs/DESIGN_GOALS.md

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,7 @@ The idea of React Compiler is to allow developers to use React's familiar declar

* Bound the amount of re-rendering that happens on updates to ensure that apps have predictably fast performance by default.
* Keep startup time neutral with pre-React Compiler performance. Notably, this means holding code size increases and memoization overhead low enough to not impact startup.
* Retain React's familiar declarative, component-oriented programming model. Ie, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* Retain React's familiar declarative, component-oriented programming model. i.e, the solution should not fundamentally change how developers think about writing React, and should generally _remove_ concepts (the need to use React.memo(), useMemo(), and useCallback()) rather than introduce new concepts.
* "Just work" on idiomatic React code that follows React's rules (pure render functions, the rules of hooks, etc).
* Support typical debugging and profiling tools and workflows.
* Be predictable and understandable enough by React developers — i.e. developers should be able to quickly develop a rough intuition of how React Compiler works.
Expand Down

6 changes: 3 additions & 3 deletions
...packages/babel-plugin-react-compiler/src/Inference/MUTABILITY_ALIASING_MODEL.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -24,7 +24,7 @@ The goal of mutability and aliasing inference is to understand the set of instru

In code, the mutability and aliasing model is compromised of the following phases:

* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errros) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingEffects`. Infers a set of mutation and aliasing effects for each instruction. The approach is to generate a set of candidate effects based purely on the semantics of each instruction and the types of the operands, then use abstract interpretation to determine the actual effects (or errors) that would apply. For example, an instruction that by default has a Capture effect might downgrade to an ImmutableCapture effect if the value is known to be frozen.
* `InferMutationAliasingRanges`. Infers a mutable range (start:end instruction ids) for each value in the program, and annotates each Place with its effect type for usage in later passes. This builds a graph of data flow through the program over time in order to understand which mutations effect which values.
* `InferReactiveScopeVariables`. Given the per-Place effects, determines disjoint sets of values that mutate together and assigns all identifiers in each set to a unique scope, and updates the range to include the ranges of all constituent values.

Expand DownExpand Up@@ -69,7 +69,7 @@ Describes the creation of new function value, capturing the given set of mutable
 kind: 'Apply';
 receiver: Place;
 function: Place; // same as receiver for function calls
 mutatesFunction: boolean; // indicates if this is a type that we consdier to mutate the function itself by default
 mutatesFunction: boolean; // indicates if this is a type that we consider to mutate the function itself by default
 args: Array<Place | SpreadPattern | Hole>;
 into: Place; // where result is stored
 signature: FunctionSignature | null;
Expand DownExpand Up@@ -526,7 +526,7 @@ Capture c <- a

Intuition: these effects are inverses of each other (capturing into an object, extracting from an object). The result is based on the order of operations:

Capture then CreatFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.
Capture then CreateFrom is equivalent to Alias: we have to assume that the result _is_ the original value and that a local mutation of the result could mutate the original.

```js
const b = [a]; // capture
Expand Down
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