@wordpress/editor/build/components/post-revisions-preview/preserve-client-ids.cjs.map

Enhanced block editor for WordPress posts.

{
  "version": 3,
  "sources": ["../../../src/components/post-revisions-preview/preserve-client-ids.js"],
  "sourcesContent": ["/**\n * External dependencies\n */\nimport { diffArrays } from 'diff/lib/diff/array';\n\n/**\n * Preserves clientIds from previously rendered blocks to prevent flashing.\n * Uses LCS algorithm to match blocks by name.\n *\n * This compares the newly parsed blocks against the last rendered blocks\n * to maintain React key stability.\n *\n * @param {Array} newBlocks  Newly parsed blocks with fresh clientIds.\n * @param {Array} prevBlocks Previously rendered blocks with stable clientIds.\n * @return {Array} Blocks with preserved clientIds where possible.\n */\nexport function preserveClientIds( newBlocks, prevBlocks ) {\n\tif ( ! prevBlocks?.length || ! newBlocks?.length ) {\n\t\treturn newBlocks;\n\t}\n\n\t// Create signatures for LCS matching using block name.\n\tconst newSigs = newBlocks.map( ( block ) => block.name );\n\tconst prevSigs = prevBlocks.map( ( block ) => block.name );\n\n\tconst diffResult = diffArrays( prevSigs, newSigs );\n\n\tlet newIndex = 0;\n\tlet prevIndex = 0;\n\tconst result = [];\n\n\tfor ( const chunk of diffResult ) {\n\t\tif ( chunk.removed ) {\n\t\t\t// Blocks only in prev render - skip them.\n\t\t\tprevIndex += chunk.count;\n\t\t} else if ( chunk.added ) {\n\t\t\t// Blocks only in new render - keep new clientIds.\n\t\t\tfor ( let i = 0; i < chunk.count; i++ ) {\n\t\t\t\tresult.push( newBlocks[ newIndex++ ] );\n\t\t\t}\n\t\t} else {\n\t\t\t// Matched blocks - preserve clientIds from prev render.\n\t\t\tfor ( let i = 0; i < chunk.count; i++ ) {\n\t\t\t\tconst newBlock = newBlocks[ newIndex++ ];\n\t\t\t\tconst prevBlock = prevBlocks[ prevIndex++ ];\n\t\t\t\tresult.push( {\n\t\t\t\t\t...newBlock,\n\t\t\t\t\tclientId: prevBlock.clientId,\n\t\t\t\t\tinnerBlocks: preserveClientIds(\n\t\t\t\t\t\tnewBlock.innerBlocks,\n\t\t\t\t\t\tprevBlock.innerBlocks\n\t\t\t\t\t),\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\t}\n\n\treturn result;\n}\n"],
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  "names": []
}