@wordpress/compose/build/hooks/use-media-query/index.cjs.map

WordPress higher-order components (HOCs).

{
  "version": 3,
  "sources": ["../../../src/hooks/use-media-query/index.ts"],
  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport { useSyncExternalStore } from '@wordpress/element';\n\ntype MQLSubscriber = {\n\tsubscribe: ( onStoreChange: () => void ) => () => void;\n\tgetValue: () => boolean;\n};\n\n// One subscriber per (window, query). The underlying MediaQueryList lives\n// inside the subscriber's closure; a single `change` listener fans out to\n// every React consumer via an in-JS `Set` to avoid the per-consumer\n// `addEventListener` cost (~85 ms during a large-post editor mount).\nconst perWindowCache = new WeakMap< Window, Map< string, MQLSubscriber > >();\n\nconst EMPTY_SUBSCRIBER: MQLSubscriber = {\n\tsubscribe: () => () => {},\n\tgetValue: () => false,\n};\n\nfunction getMQLSubscriber(\n\tview: Window | undefined,\n\tquery?: string\n): MQLSubscriber {\n\tif ( ! view || ! query || typeof view.matchMedia !== 'function' ) {\n\t\treturn EMPTY_SUBSCRIBER;\n\t}\n\n\tlet queryCache = perWindowCache.get( view );\n\tif ( ! queryCache ) {\n\t\tqueryCache = new Map();\n\t\tperWindowCache.set( view, queryCache );\n\t}\n\n\tconst cached = queryCache.get( query );\n\tif ( cached ) {\n\t\treturn cached;\n\t}\n\n\tconst mediaQueryList = view.matchMedia( query );\n\tconst listeners = new Set< () => void >();\n\tconst notify = () => {\n\t\tfor ( const listener of listeners ) {\n\t\t\tlistener();\n\t\t}\n\t};\n\n\tconst subscriber: MQLSubscriber = {\n\t\tsubscribe( onStoreChange ) {\n\t\t\tif ( listeners.size === 0 ) {\n\t\t\t\t// Avoid a fatal error when browsers don't support `addEventListener` on MediaQueryList.\n\t\t\t\tmediaQueryList.addEventListener?.( 'change', notify );\n\t\t\t}\n\t\t\tlisteners.add( onStoreChange );\n\t\t\treturn () => {\n\t\t\t\tlisteners.delete( onStoreChange );\n\t\t\t\tif ( listeners.size === 0 ) {\n\t\t\t\t\tmediaQueryList.removeEventListener?.( 'change', notify );\n\t\t\t\t}\n\t\t\t};\n\t\t},\n\t\tgetValue() {\n\t\t\treturn mediaQueryList.matches;\n\t\t},\n\t};\n\n\tqueryCache.set( query, subscriber );\n\treturn subscriber;\n}\n\n/**\n * Runs a media query and returns its value when it changes.\n *\n * @param [query] Media Query.\n * @param [view]  Window instance, else default to global window\n * @return return value of the media query.\n */\nexport default function useMediaQuery(\n\tquery?: string,\n\t// Resolve the default lazily so SSR (where `window` is undeclared) does not\n\t// throw a ReferenceError when this default expression is evaluated.\n\tview: Window | undefined = typeof window !== 'undefined'\n\t\t? window\n\t\t: undefined\n): boolean {\n\tconst source = getMQLSubscriber( view, query );\n\n\treturn useSyncExternalStore(\n\t\tsource.subscribe,\n\t\tsource.getValue,\n\t\t() => false\n\t);\n}\n"],
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