{ "version": 3, "sources": ["../src/presence.tsx", "../src/use-state-machine.tsx"], "sourcesContent": ["import * as React from 'react';\nimport { useComposedRefs } from '@radix-ui/react-compose-refs';\nimport { useLayoutEffect } from '@radix-ui/react-use-layout-effect';\nimport { useStateMachine } from './use-state-machine';\n\ninterface PresenceProps {\n children: React.ReactElement | ((props: { present: boolean }) => React.ReactElement);\n present: boolean;\n}\n\nconst Presence: React.FC = (props) => {\n const { present, children } = props;\n const presence = usePresence(present);\n\n const child = (\n typeof children === 'function'\n ? children({ present: presence.isPresent })\n : React.Children.only(children)\n ) as React.ReactElement<{ ref?: React.Ref }>;\n\n const ref = useComposedRefs(presence.ref, getElementRef(child));\n const forceMount = typeof children === 'function';\n return forceMount || presence.isPresent ? React.cloneElement(child, { ref }) : null;\n};\n\nPresence.displayName = 'Presence';\n\n/* -------------------------------------------------------------------------------------------------\n * usePresence\n * -----------------------------------------------------------------------------------------------*/\n\nfunction usePresence(present: boolean) {\n const [node, setNode] = React.useState();\n const stylesRef = React.useRef(null);\n const prevPresentRef = React.useRef(present);\n const prevAnimationNameRef = React.useRef('none');\n const initialState = present ? 'mounted' : 'unmounted';\n const [state, send] = useStateMachine(initialState, {\n mounted: {\n UNMOUNT: 'unmounted',\n ANIMATION_OUT: 'unmountSuspended',\n },\n unmountSuspended: {\n MOUNT: 'mounted',\n ANIMATION_END: 'unmounted',\n },\n unmounted: {\n MOUNT: 'mounted',\n },\n });\n\n React.useEffect(() => {\n const currentAnimationName = getAnimationName(stylesRef.current);\n prevAnimationNameRef.current = state === 'mounted' ? currentAnimationName : 'none';\n }, [state]);\n\n useLayoutEffect(() => {\n const styles = stylesRef.current;\n const wasPresent = prevPresentRef.current;\n const hasPresentChanged = wasPresent !== present;\n\n if (hasPresentChanged) {\n const prevAnimationName = prevAnimationNameRef.current;\n const currentAnimationName = getAnimationName(styles);\n\n if (present) {\n send('MOUNT');\n } else if (currentAnimationName === 'none' || styles?.display === 'none') {\n // If there is no exit animation or the element is hidden, animations won't run\n // so we unmount instantly\n send('UNMOUNT');\n } else {\n /**\n * When `present` changes to `false`, we check changes to animation-name to\n * determine whether an animation has started. We chose this approach (reading\n * computed styles) because there is no `animationrun` event and `animationstart`\n * fires after `animation-delay` has expired which would be too late.\n */\n const isAnimating = prevAnimationName !== currentAnimationName;\n\n if (wasPresent && isAnimating) {\n send('ANIMATION_OUT');\n } else {\n send('UNMOUNT');\n }\n }\n\n prevPresentRef.current = present;\n }\n }, [present, send]);\n\n useLayoutEffect(() => {\n if (node) {\n let timeoutId: number;\n const ownerWindow = node.ownerDocument.defaultView ?? window;\n /**\n * Triggering an ANIMATION_OUT during an ANIMATION_IN will fire an `animationcancel`\n * event for ANIMATION_IN after we have entered `unmountSuspended` state. So, we\n * make sure we only trigger ANIMATION_END for the currently active animation.\n */\n const handleAnimationEnd = (event: AnimationEvent) => {\n const currentAnimationName = getAnimationName(stylesRef.current);\n // The event.animationName is unescaped for CSS syntax,\n // so we need to escape it to compare with the animationName computed from the style.\n const isCurrentAnimation = currentAnimationName.includes(CSS.escape(event.animationName));\n if (event.target === node && isCurrentAnimation) {\n // With React 18 concurrency this update is applied a frame after the\n // animation ends, creating a flash of visible content. By setting the\n // animation fill mode to \"forwards\", we force the node to keep the\n // styles of the last keyframe, removing the flash.\n //\n // Previously we flushed the update via ReactDom.flushSync, but with\n // exit animations this resulted in the node being removed from the\n // DOM before the synthetic animationEnd event was dispatched, meaning\n // user-provided event handlers would not be called.\n // https://github.com/radix-ui/primitives/pull/1849\n send('ANIMATION_END');\n if (!prevPresentRef.current) {\n const currentFillMode = node.style.animationFillMode;\n node.style.animationFillMode = 'forwards';\n // Reset the style after the node had time to unmount (for cases\n // where the component chooses not to unmount). Doing this any\n // sooner than `setTimeout` (e.g. with `requestAnimationFrame`)\n // still causes a flash.\n timeoutId = ownerWindow.setTimeout(() => {\n if (node.style.animationFillMode === 'forwards') {\n node.style.animationFillMode = currentFillMode;\n }\n });\n }\n }\n };\n const handleAnimationStart = (event: AnimationEvent) => {\n if (event.target === node) {\n // if animation occurred, store its name as the previous animation.\n prevAnimationNameRef.current = getAnimationName(stylesRef.current);\n }\n };\n node.addEventListener('animationstart', handleAnimationStart);\n node.addEventListener('animationcancel', handleAnimationEnd);\n node.addEventListener('animationend', handleAnimationEnd);\n return () => {\n ownerWindow.clearTimeout(timeoutId);\n node.removeEventListener('animationstart', handleAnimationStart);\n node.removeEventListener('animationcancel', handleAnimationEnd);\n node.removeEventListener('animationend', handleAnimationEnd);\n };\n } else {\n // Transition to the unmounted state if the node is removed prematurely.\n // We avoid doing so during cleanup as the node may change but still exist.\n send('ANIMATION_END');\n }\n }, [node, send]);\n\n return {\n isPresent: ['mounted', 'unmountSuspended'].includes(state),\n ref: React.useCallback((node: HTMLElement) => {\n stylesRef.current = node ? getComputedStyle(node) : null;\n setNode(node);\n }, []),\n };\n}\n\n/* -----------------------------------------------------------------------------------------------*/\n\nfunction getAnimationName(styles: CSSStyleDeclaration | null) {\n return styles?.animationName || 'none';\n}\n\n// Before React 19 accessing `element.props.ref` will throw a warning and suggest using `element.ref`\n// After React 19 accessing `element.ref` does the opposite.\n// https://github.com/facebook/react/pull/28348\n//\n// Access the ref using the method that doesn't yield a warning.\nfunction getElementRef(element: React.ReactElement<{ ref?: React.Ref }>) {\n // React <=18 in DEV\n let getter = Object.getOwnPropertyDescriptor(element.props, 'ref')?.get;\n let mayWarn = getter && 'isReactWarning' in getter && getter.isReactWarning;\n if (mayWarn) {\n return (element as any).ref;\n }\n\n // React 19 in DEV\n getter = Object.getOwnPropertyDescriptor(element, 'ref')?.get;\n mayWarn = getter && 'isReactWarning' in getter && getter.isReactWarning;\n if (mayWarn) {\n return element.props.ref;\n }\n\n // Not DEV\n return element.props.ref || (element as any).ref;\n}\n\nconst Root = Presence;\n\nexport {\n Presence,\n //\n Root,\n};\nexport type { PresenceProps };\n", "import * as React from 'react';\n\ntype Machine = { [k: string]: { [k: string]: S } };\ntype MachineState = keyof T;\ntype MachineEvent = keyof UnionToIntersection;\n\n// \uD83E\uDD2F https://fettblog.eu/typescript-union-to-intersection/\ntype UnionToIntersection = (T extends any ? 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