@wordpress/compose/build-module/hooks/use-resize-observer/use-resize-observer.mjs.map

WordPress higher-order components (HOCs).

{
  "version": 3,
  "sources": ["../../../src/hooks/use-resize-observer/use-resize-observer.ts"],
  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport { useRef } from '@wordpress/element';\n/**\n * Internal dependencies\n */\nimport useEvent from '../use-event';\n\n// This is the current implementation of `useResizeObserver`.\n//\n// The legacy implementation is still supported for backwards compatibility.\n// This is achieved by overloading the exported function with both signatures,\n// and detecting which API is being used at runtime.\nexport function useResizeObserver< T extends HTMLElement >(\n\tcallback: ResizeObserverCallback,\n\tresizeObserverOptions: ResizeObserverOptions = {}\n): ( element?: T | null ) => void {\n\tconst callbackEvent = useEvent( callback );\n\n\tconst observedElementRef = useRef< T | null >( null );\n\tconst resizeObserverRef = useRef< ResizeObserver >( undefined );\n\treturn useEvent( ( element?: T | null ) => {\n\t\tif ( element === observedElementRef.current ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Set up `ResizeObserver`.\n\t\tresizeObserverRef.current ??= new ResizeObserver( callbackEvent );\n\t\tconst { current: resizeObserver } = resizeObserverRef;\n\n\t\t// Unobserve previous element.\n\t\tif ( observedElementRef.current ) {\n\t\t\tresizeObserver.unobserve( observedElementRef.current );\n\t\t}\n\n\t\t// Observe new element.\n\t\tobservedElementRef.current = element ?? null;\n\t\tif ( element ) {\n\t\t\tresizeObserver.observe( element, resizeObserverOptions );\n\t\t}\n\t} );\n}\n"],
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