[react] Add unstable_Activity (DefinitelyTyped#72454)

Author: eps1lon

types/react/experimental.d.ts

@@ -214,4 +214,19 @@ declare module "." {
     export interface FragmentProps {
         ref?: Ref<FragmentInstance> | undefined;
     }
+
+    // @enableActivity
+    export interface ActivityProps {
+        /**
+         * @default "visible"
+         */
+        mode?:
+            | "hidden"
+            | "visible"
+            | undefined;
+        children: ReactNode;
+    }
+
+    /** */
+    export const unstable_Activity: ExoticComponent<ActivityProps>;
 }

types/react/test/experimental.tsx

@@ -284,3 +284,20 @@ function fragmentRefTest() {
         <div />
     </React.Fragment>;
 }
+
+// @enableActivity
+function activityTest() {
+    const Activity = React.unstable_Activity;
+
+    <Activity children="peekaboo" />;
+    <Activity children="peekaboo" mode={undefined} />;
+    <Activity children="peekaboo" mode="visible" />;
+    <Activity children="peekaboo" mode="hidden" />;
+    // @ts-expect-error -- Forgot children
+    <Activity />;
+    <Activity
+        children="peekaboo"
+        // @ts-expect-error -- Unknown mode
+        mode="not-a-mode"
+    />;
+}

types/react/ts5.0/experimental.d.ts

@@ -214,4 +214,19 @@ declare module "." {
     export interface FragmentProps {
         ref?: Ref<FragmentInstance> | undefined;
     }
+
+    // @enableActivity
+    export interface ActivityProps {
+        /**
+         * @default "visible"
+         */
+        mode?:
+            | "hidden"
+            | "visible"
+            | undefined;
+        children: ReactNode;
+    }
+
+    /** */
+    export const unstable_Activity: ExoticComponent<ActivityProps>;
 }

types/react/ts5.0/test/experimental.tsx

@@ -287,3 +287,20 @@ function fragmentRefTest() {
         <div />
     </React.Fragment>;
 }
+
+// @enableActivity
+function activityTest() {
+    const Activity = React.unstable_Activity;
+
+    <Activity children="peekaboo" />;
+    <Activity children="peekaboo" mode={undefined} />;
+    <Activity children="peekaboo" mode="visible" />;
+    <Activity children="peekaboo" mode="hidden" />;
+    // @ts-expect-error -- Forgot children
+    <Activity />;
+    <Activity
+        children="peekaboo"
+        // @ts-expect-error -- Unknown mode
+        mode="not-a-mode"
+    />;
+}