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[DevTools] Disable Activity slices by default #35685

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Merged
eps1lon merged 2 commits into from
Feb 4, 2026
+7 −1
Merged

[DevTools] Disable Activity slices by default #35685

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[DevTools] Disable Activity slices by default
eps1lon Feb 3, 2026
2caab0c
Turn on for local development
eps1lon Feb 3, 2026
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1 change: 1 addition & 0 deletions packages/react-devtools-shared/src/config/DevToolsFeatureFlags.core-fb.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
* It should always be imported from "react-devtools-feature-flags".
************************************************************************/

export const enableActivitySlices: boolean = false;
export const enableLogger: boolean = true;
export const enableStyleXFeatures: boolean = true;
export const isInternalFacebookBuild: boolean = true;
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1 change: 1 addition & 0 deletions packages/react-devtools-shared/src/config/DevToolsFeatureFlags.core-oss.js
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Expand Up @@ -13,6 +13,7 @@
* It should always be imported from "react-devtools-feature-flags".
************************************************************************/

export const enableActivitySlices: boolean = __DEV__;
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@eps1lon eps1lon Feb 3, 2026

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__DEV__ is resolved at build time of the DevTools target. It's not the same thing as __DEV__ in the React runtime.

export const enableLogger: boolean = false;
export const enableStyleXFeatures: boolean = false;
export const isInternalFacebookBuild: boolean = false;
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1 change: 1 addition & 0 deletions packages/react-devtools-shared/src/config/DevToolsFeatureFlags.default.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
* It should always be imported from "react-devtools-feature-flags".
************************************************************************/

export const enableActivitySlices: boolean = __DEV__;
export const enableLogger: boolean = false;
export const enableStyleXFeatures: boolean = false;
export const isInternalFacebookBuild: boolean = false;
1 change: 1 addition & 0 deletions packages/react-devtools-shared/src/config/DevToolsFeatureFlags.extension-fb.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
* It should always be imported from "react-devtools-feature-flags".
************************************************************************/

export const enableActivitySlices: boolean = false;
export const enableLogger: boolean = true;
export const enableStyleXFeatures: boolean = true;
export const isInternalFacebookBuild: boolean = true;
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1 change: 1 addition & 0 deletions packages/react-devtools-shared/src/config/DevToolsFeatureFlags.extension-oss.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
* It should always be imported from "react-devtools-feature-flags".
************************************************************************/

export const enableActivitySlices: boolean = __DEV__;
export const enableLogger: boolean = false;
export const enableStyleXFeatures: boolean = false;
export const isInternalFacebookBuild: boolean = false;
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3 changes: 2 additions & 1 deletion packages/react-devtools-shared/src/devtools/views/SuspenseTab/SuspenseTab.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ import {
Fragment,
} from 'react';

import {enableActivitySlices} from 'react-devtools-feature-flags';
import {
localStorageGetItem,
localStorageSetItem,
Expand Down Expand Up @@ -284,7 +285,7 @@ function SuspenseTab(_: {}) {
const {activities} = useContext(TreeStateContext);
// If there are no named Activity boundaries, we don't have any tree list and we should hide
// both the panel and the button to toggle it.
const activityListDisabled = activities.length === 0;
const activityListDisabled = !enableActivitySlices || activities.length === 0;

const wrapperTreeRef = useRef<null | HTMLElement>(null);
const resizeTreeRef = useRef<null | HTMLElement>(null);
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