{
  "version": 3,
  "sources": ["../src/index.ts"],
  "sourcesContent": ["type GlobalScopeWithStyleRuntime = typeof globalThis & {\n\t// This global is shared by separately bundled copies of this package.\n\t// Keep its shape backward compatible after release.\n\t__wpStyleRuntime?: {\n\t\tdocuments: Map< Document, number >;\n\t\tstyles: Map< string, string >;\n\t\tinjectedStyles: WeakMap< Document, Set< string > >;\n\t};\n};\n\nconst STYLE_HASH_ATTRIBUTE = 'data-wp-hash';\n\n/**\n * Returns the shared style runtime registry.\n *\n * The registry is stored on `globalThis` so separately bundled copies of this\n * package can coordinate through the same document and style maps.\n *\n * @return The shared runtime registry.\n */\nfunction getRuntime() {\n\tconst globalScope = globalThis as GlobalScopeWithStyleRuntime;\n\n\tif ( globalScope.__wpStyleRuntime ) {\n\t\treturn globalScope.__wpStyleRuntime;\n\t}\n\n\tglobalScope.__wpStyleRuntime = {\n\t\tdocuments: new Map(),\n\t\tstyles: new Map(),\n\t\tinjectedStyles: new WeakMap(),\n\t};\n\n\tif ( typeof document !== 'undefined' ) {\n\t\tregisterDocument( document );\n\t}\n\n\treturn globalScope.__wpStyleRuntime;\n}\n\n/**\n * Checks whether a document already contains a style tag for a hash.\n *\n * @param targetDocument Document to inspect.\n * @param hash           Stable hash for the transformed CSS.\n *\n * @return Whether the style hash already exists in the document.\n */\nfunction documentContainsStyleHash(\n\ttargetDocument: Document,\n\thash: string\n): boolean {\n\tif ( ! targetDocument.head ) {\n\t\treturn false;\n\t}\n\n\tfor ( const style of targetDocument.head.querySelectorAll(\n\t\t`style[${ STYLE_HASH_ATTRIBUTE }]`\n\t) ) {\n\t\tif ( style.getAttribute( STYLE_HASH_ATTRIBUTE ) === hash ) {\n\t\t\treturn true;\n\t\t}\n\t}\n\n\treturn false;\n}\n\n/**\n * Injects a registered style into a document, unless that document already\n * contains a style tag for the same hash.\n *\n * @param targetDocument Document to inject the style into.\n * @param hash           Stable hash for the transformed CSS.\n * @param css            CSS text to inject.\n */\nfunction injectStyle( targetDocument: Document, hash: string, css: string ) {\n\tif ( ! targetDocument.head ) {\n\t\treturn;\n\t}\n\n\tconst runtime = getRuntime();\n\tlet injectedStyles = runtime.injectedStyles.get( targetDocument );\n\n\tif ( ! injectedStyles ) {\n\t\tinjectedStyles = new Set();\n\t\truntime.injectedStyles.set( targetDocument, injectedStyles );\n\t}\n\n\tif ( injectedStyles.has( hash ) ) {\n\t\treturn;\n\t}\n\n\t// Older generated CSS module output can still inject matching style tags\n\t// after this document's cache is created, so keep the DOM as the fallback\n\t// source of truth on cache misses.\n\tif ( documentContainsStyleHash( targetDocument, hash ) ) {\n\t\tinjectedStyles.add( hash );\n\t\treturn;\n\t}\n\n\tconst style = targetDocument.createElement( 'style' );\n\tstyle.setAttribute( STYLE_HASH_ATTRIBUTE, hash );\n\tstyle.appendChild( targetDocument.createTextNode( css ) );\n\ttargetDocument.head.appendChild( style );\n\tinjectedStyles.add( hash );\n}\n\n/**\n * Registers a document as a style injection target.\n *\n * Existing registered styles are replayed into the document immediately.\n * Documents are reference-counted so multiple providers can safely register the\n * same document without one cleanup removing it while another registration is\n * still active.\n *\n * @param targetDocument Document to receive registered styles.\n * @return Cleanup function that unregisters this document registration.\n */\nexport function registerDocument( targetDocument: Document ) {\n\tconst runtime = getRuntime();\n\n\truntime.documents.set(\n\t\ttargetDocument,\n\t\t( runtime.documents.get( targetDocument ) ?? 0 ) + 1\n\t);\n\n\tfor ( const [ hash, css ] of runtime.styles ) {\n\t\tinjectStyle( targetDocument, hash, css );\n\t}\n\n\treturn () => {\n\t\tconst count = runtime.documents.get( targetDocument );\n\n\t\tif ( count === undefined ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( count <= 1 ) {\n\t\t\truntime.documents.delete( targetDocument );\n\t\t\treturn;\n\t\t}\n\n\t\truntime.documents.set( targetDocument, count - 1 );\n\t};\n}\n\n/**\n * Registers a style and injects it into all registered documents.\n *\n * The hash is used as the deduplication key, so calling this repeatedly with\n * the same hash will not add duplicate style tags to a document.\n * Registered styles are retained for the lifetime of the page so they can be\n * replayed into documents that are registered later.\n *\n * @param hash Stable hash for the transformed CSS.\n * @param css  CSS text to inject.\n */\nexport function registerStyle( hash: string, css: string ) {\n\tconst runtime = getRuntime();\n\n\truntime.styles.set( hash, css );\n\n\tfor ( const targetDocument of runtime.documents.keys() ) {\n\t\tinjectStyle( targetDocument, hash, css );\n\t}\n}\n"],
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