{
  "version": 3,
  "sources": ["../../src/utils/crdt-blocks.ts"],
  "sourcesContent": ["/**\n * External dependencies\n */\nimport { v4 as uuidv4 } from 'uuid';\nimport fastDeepEqual from 'fast-deep-equal/es6/index.js';\n\n/**\n * WordPress dependencies\n */\nimport { getBlockTypes } from '@wordpress/blocks';\nimport { RichTextData } from '@wordpress/rich-text';\nimport { Y } from '@wordpress/sync';\n\n/**\n * Internal dependencies\n */\nimport { createYMap, type YMapRecord, type YMapWrap } from './crdt-utils';\nimport { getCachedRichTextData } from './crdt-text';\nimport { Delta } from '../sync';\n\ninterface BlockAttributes {\n\t[ key: string ]: unknown;\n}\n\ninterface BlockAttributeSchema {\n\trole?: string;\n\ttype?: string;\n\tquery?: Record< string, BlockAttributeSchema >;\n}\n\ninterface BlockType {\n\tattributes?: Record< string, BlockAttributeSchema >;\n\tname: string;\n}\n\n// A block as represented in Gutenberg's data store.\nexport interface Block {\n\tattributes: BlockAttributes;\n\tclientId?: string;\n\tinnerBlocks: Block[];\n\tisValid?: boolean;\n\tname: string;\n\toriginalContent?: string;\n\tvalidationIssues?: string[]; // unserializable\n}\n\n// A block as represented in the CRDT document (Y.Map).\nexport interface YBlockRecord extends YMapRecord {\n\tattributes: YBlockAttributes;\n\tclientId: string;\n\tinnerBlocks: YBlocks;\n\tisValid?: boolean;\n\toriginalContent?: string;\n\tname: string;\n}\n\nexport type YBlock = YMapWrap< YBlockRecord >;\nexport type YBlocks = Y.Array< YBlock >;\n\n// Block attribute schema cannot be known at compile time, so we use Y.Map.\n// Attribute values will be typed as the union of `Y.Text` and `unknown`.\nexport type YBlockAttributes = Y.Map< Y.Text | unknown >;\n\nconst serializableBlocksCache = new WeakMap< WeakKey, Block[] >();\n\n/**\n * Recursively walk an attribute value and convert any RichTextData instances\n * to their string (HTML) representation. This is necessary for array-type and\n * object-type attributes, which can contain nested RichTextData.\n *\n * @param value The attribute value to serialize.\n * @return The value with all RichTextData instances replaced by strings.\n */\nfunction serializeAttributeValue( value: unknown ): unknown {\n\tif ( value instanceof RichTextData ) {\n\t\treturn value.valueOf();\n\t}\n\n\t// e.g. core/table `body`: [ { cells: [ { content: RichTextData } ] } ]\n\tif ( Array.isArray( value ) ) {\n\t\treturn value.map( serializeAttributeValue );\n\t}\n\n\t// e.g. a single row inside core/table `body`: { cells: [ ... ] }\n\tif ( value && typeof value === 'object' ) {\n\t\tconst result: Record< string, unknown > = {};\n\n\t\tfor ( const [ k, v ] of Object.entries( value ) ) {\n\t\t\tresult[ k ] = serializeAttributeValue( v );\n\t\t}\n\t\treturn result;\n\t}\n\n\treturn value;\n}\n\nfunction makeBlockAttributesSerializable(\n\tblockName: string,\n\tattributes: BlockAttributes\n): BlockAttributes {\n\tconst newAttributes = { ...attributes };\n\tfor ( const [ key, value ] of Object.entries( attributes ) ) {\n\t\tif ( isLocalAttribute( blockName, key ) ) {\n\t\t\tdelete newAttributes[ key ];\n\t\t\tcontinue;\n\t\t}\n\n\t\tnewAttributes[ key ] = serializeAttributeValue( value );\n\t}\n\treturn newAttributes;\n}\n\nfunction makeBlocksSerializable( blocks: Block[] ): Block[] {\n\treturn blocks.map( ( block: Block ) => {\n\t\tconst { name, innerBlocks, attributes, ...rest } = block;\n\t\tdelete rest.validationIssues;\n\t\treturn {\n\t\t\t...rest,\n\t\t\tname,\n\t\t\tattributes: makeBlockAttributesSerializable( name, attributes ),\n\t\t\tinnerBlocks: makeBlocksSerializable( innerBlocks ),\n\t\t};\n\t} );\n}\n\n/**\n * Recursively walk an attribute value and convert any strings that correspond\n * to rich-text schema nodes into RichTextData instances. This is the inverse\n * of serializeAttributeValue and handles nested structures like table cells.\n *\n * @param schema The attribute type definition for this value.\n * @param value  The attribute value from CRDT (toJSON).\n * @return The value with rich-text strings replaced by RichTextData.\n */\nfunction deserializeAttributeValue(\n\tschema: BlockAttributeSchema | undefined,\n\tvalue: unknown\n): unknown {\n\tif ( schema?.type === 'rich-text' && typeof value === 'string' ) {\n\t\treturn getCachedRichTextData( value );\n\t}\n\n\t// e.g. core/table `body`: [ { cells: [ { content: RichTextData } ] } ]\n\tif ( Array.isArray( value ) ) {\n\t\treturn value.map( ( item ) =>\n\t\t\tdeserializeAttributeValue( schema, item )\n\t\t);\n\t}\n\n\t// e.g. a single row inside core/table `body`: { cells: [ ... ] }\n\tif ( value && typeof value === 'object' ) {\n\t\tconst result: Record< string, unknown > = {};\n\n\t\tfor ( const [ key, innerValue ] of Object.entries(\n\t\t\tvalue as Record< string, unknown >\n\t\t) ) {\n\t\t\tresult[ key ] = deserializeAttributeValue(\n\t\t\t\tschema?.query?.[ key ],\n\t\t\t\tinnerValue\n\t\t\t);\n\t\t}\n\n\t\treturn result;\n\t}\n\n\treturn value;\n}\n\n/**\n * Convert blocks from their CRDT-serialized form back to the runtime form\n * expected by the block editor. Rich-text attributes are stored as Y.Text in\n * the CRDT document, which serializes to plain strings via toJSON(). This\n * function restores them to RichTextData instances so that block edit\n * components that rely on RichTextData methods (e.g. `.text`) work correctly.\n *\n * @param blocks Blocks as extracted from the CRDT document via toJSON().\n * @return Blocks with rich-text attributes restored to RichTextData.\n */\nexport function deserializeBlockAttributes( blocks: Block[] ): Block[] {\n\treturn blocks.map( ( block: Block ) => {\n\t\tconst { name, innerBlocks, attributes, ...rest } = block;\n\n\t\tconst newAttributes = { ...attributes };\n\n\t\tfor ( const [ key, value ] of Object.entries( attributes ) ) {\n\t\t\tconst schema = getBlockAttributeSchema( name, key );\n\n\t\t\tif ( schema ) {\n\t\t\t\tnewAttributes[ key ] = deserializeAttributeValue(\n\t\t\t\t\tschema,\n\t\t\t\t\tvalue\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\t...rest,\n\t\t\tname,\n\t\t\tattributes: newAttributes,\n\t\t\tinnerBlocks: deserializeBlockAttributes( innerBlocks ?? [] ),\n\t\t};\n\t} );\n}\n\n/**\n * @param {any}   gblock\n * @param {Y.Map} yblock\n */\nfunction areBlocksEqual( gblock: Block, yblock: YBlock ): boolean {\n\tconst yblockAsJson = yblock.toJSON();\n\n\t// we must not sync clientId, as this can't be generated consistently and\n\t// hence will lead to merge conflicts.\n\tconst overwrites = {\n\t\tinnerBlocks: null,\n\t\tclientId: null,\n\t};\n\tconst res = fastDeepEqual(\n\t\tObject.assign( {}, gblock, overwrites ),\n\t\tObject.assign( {}, yblockAsJson, overwrites )\n\t);\n\tconst inners = gblock.innerBlocks || [];\n\tconst yinners = yblock.get( 'innerBlocks' );\n\treturn (\n\t\tres &&\n\t\tinners.length === yinners?.length &&\n\t\tinners.every( ( block: Block, i: number ) =>\n\t\t\tareBlocksEqual( block, yinners.get( i ) )\n\t\t)\n\t);\n}\n\nfunction createNewYAttributeMap(\n\tblockName: string,\n\tattributes: BlockAttributes\n): YBlockAttributes {\n\treturn new Y.Map(\n\t\tObject.entries( attributes ).map(\n\t\t\t( [ attributeName, attributeValue ] ) => {\n\t\t\t\treturn [\n\t\t\t\t\tattributeName,\n\t\t\t\t\tcreateNewYAttributeValue(\n\t\t\t\t\t\tblockName,\n\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\tattributeValue\n\t\t\t\t\t),\n\t\t\t\t];\n\t\t\t}\n\t\t)\n\t);\n}\n\nfunction createNewYAttributeValue(\n\tblockName: string,\n\tattributeName: string,\n\tattributeValue: unknown\n): Y.Text | Y.Array< unknown > | Y.Map< unknown > | unknown {\n\tconst schema = getBlockAttributeSchema( blockName, attributeName );\n\treturn createYValueFromSchema( schema, attributeValue );\n}\n\n/**\n * Recursively create the appropriate Y.js type for a value based on its\n * block-attribute schema.\n *\n * - `rich-text`          -> Y.Text\n * - `array`  with query  -> Y.Array of Y.Maps\n * - `object` with query  -> Y.Map\n * - anything else        -> plain value (unchanged)\n *\n * @param schema The attribute type definition.\n * @param value  The plain JS value to convert.\n * @return A Y.js type or the original value.\n */\nfunction createYValueFromSchema(\n\tschema: BlockAttributeSchema | undefined,\n\tvalue: unknown\n): Y.Text | Y.Array< unknown > | Y.Map< unknown > | unknown {\n\tif ( ! schema ) {\n\t\treturn value;\n\t}\n\n\tif ( schema.type === 'rich-text' ) {\n\t\treturn new Y.Text( value?.toString() ?? '' );\n\t}\n\n\tif ( schema.type === 'array' && schema.query && Array.isArray( value ) ) {\n\t\tconst query = schema.query;\n\t\tconst yArray = new Y.Array< Y.Map< unknown > >();\n\n\t\tyArray.insert(\n\t\t\t0,\n\t\t\tvalue.map( ( item ) => createYMapFromQuery( query, item ) )\n\t\t);\n\n\t\treturn yArray;\n\t}\n\n\tif ( schema.type === 'object' && schema.query && isRecord( value ) ) {\n\t\treturn createYMapFromQuery( schema.query, value );\n\t}\n\n\treturn value;\n}\n\n/**\n * Type guard that narrows `unknown` to `Record< string, unknown >`.\n *\n * @param value Value to check.\n * @return True if `value` is a non-null, non-array object.\n */\nfunction isRecord( value: unknown ): value is Record< string, unknown > {\n\treturn !! value && typeof value === 'object' && ! Array.isArray( value );\n}\n\n/**\n * Create a Y.Map from a plain object, using a query schema to decide which\n * properties should become nested Y.js types (Y.Text, Y.Array, Y.Map).\n *\n * @param query The query schema defining the properties.\n * @param obj   The plain object to convert.\n * @return A Y.Map with typed values.\n */\nfunction createYMapFromQuery(\n\tquery: Record< string, BlockAttributeSchema >,\n\tobj: unknown\n): Y.Map< unknown > {\n\tif ( ! isRecord( obj ) ) {\n\t\treturn new Y.Map();\n\t}\n\n\tconst entries: [ string, unknown ][] = Object.entries( obj ).map(\n\t\t( [ key, val ] ): [ string, unknown ] => {\n\t\t\tconst subSchema = query[ key ];\n\t\t\treturn [ key, createYValueFromSchema( subSchema, val ) ];\n\t\t}\n\t);\n\n\treturn new Y.Map( entries );\n}\n\nfunction createNewYBlock( block: Block ): YBlock {\n\treturn createYMap< YBlockRecord >(\n\t\tObject.fromEntries(\n\t\t\tObject.entries( block ).map( ( [ key, value ] ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase 'attributes': {\n\t\t\t\t\t\treturn [\n\t\t\t\t\t\t\tkey,\n\t\t\t\t\t\t\tcreateNewYAttributeMap( block.name, value ),\n\t\t\t\t\t\t];\n\t\t\t\t\t}\n\n\t\t\t\t\tcase 'innerBlocks': {\n\t\t\t\t\t\tconst innerBlocks = new Y.Array();\n\n\t\t\t\t\t\t// If not an array, set to empty Y.Array.\n\t\t\t\t\t\tif ( ! Array.isArray( value ) ) {\n\t\t\t\t\t\t\treturn [ key, innerBlocks ];\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tinnerBlocks.insert(\n\t\t\t\t\t\t\t0,\n\t\t\t\t\t\t\tvalue.map( ( innerBlock: Block ) =>\n\t\t\t\t\t\t\t\tcreateNewYBlock( innerBlock )\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\n\t\t\t\t\t\treturn [ key, innerBlocks ];\n\t\t\t\t\t}\n\n\t\t\t\t\tdefault:\n\t\t\t\t\t\treturn [ key, value ];\n\t\t\t\t}\n\t\t\t} )\n\t\t)\n\t);\n}\n\n/**\n * Merge incoming block data into the local Y.Doc.\n * This function is called to sync local block changes to a shared Y.Doc.\n *\n * @param yblocks        The blocks in the local Y.Doc.\n * @param incomingBlocks Gutenberg blocks being synced.\n * @param cursorPosition The position of the cursor after the change occurs.\n */\nexport function mergeCrdtBlocks(\n\tyblocks: YBlocks,\n\tincomingBlocks: Block[],\n\tcursorPosition: number | null\n): void {\n\t// Ensure we are working with serializable block data.\n\tif ( ! serializableBlocksCache.has( incomingBlocks ) ) {\n\t\tserializableBlocksCache.set(\n\t\t\tincomingBlocks,\n\t\t\tmakeBlocksSerializable( incomingBlocks )\n\t\t);\n\t}\n\tconst blocksToSync = serializableBlocksCache.get( incomingBlocks ) ?? [];\n\n\t// This is a rudimentary diff implementation similar to the y-prosemirror diffing\n\t// approach.\n\t// A better implementation would also diff the textual content and represent it\n\t// using a Y.Text type.\n\t// However, at this time it makes more sense to keep this algorithm generic to\n\t// support all kinds of block types.\n\t// Ideally, we ensure that block data structure have a consistent data format.\n\t// E.g.:\n\t//   - textual content (using rich-text formatting?) may always be stored under `block.text`\n\t//   - local information that shouldn't be shared (e.g. clientId or isDragging) is stored under `block.private`\n\t//\n\t// @credit Kevin Jahns (dmonad)\n\t// @link https://github.com/WordPress/gutenberg/pull/68483\n\tconst numOfCommonEntries = Math.min(\n\t\tblocksToSync.length ?? 0,\n\t\tyblocks.length\n\t);\n\n\tlet left = 0;\n\tlet right = 0;\n\n\t// skip equal blocks from left\n\tfor (\n\t\t;\n\t\tleft < numOfCommonEntries &&\n\t\tareBlocksEqual( blocksToSync[ left ], yblocks.get( left ) );\n\t\tleft++\n\t) {\n\t\t/* nop */\n\t}\n\n\t// skip equal blocks from right\n\tfor (\n\t\t;\n\t\tright < numOfCommonEntries - left &&\n\t\tareBlocksEqual(\n\t\t\tblocksToSync[ blocksToSync.length - right - 1 ],\n\t\t\tyblocks.get( yblocks.length - right - 1 )\n\t\t);\n\t\tright++\n\t) {\n\t\t/* nop */\n\t}\n\n\tconst numOfUpdatesNeeded = numOfCommonEntries - left - right;\n\tconst numOfInsertionsNeeded = Math.max(\n\t\t0,\n\t\tblocksToSync.length - yblocks.length\n\t);\n\tconst numOfDeletionsNeeded = Math.max(\n\t\t0,\n\t\tyblocks.length - blocksToSync.length\n\t);\n\n\t// updates\n\tfor ( let i = 0; i < numOfUpdatesNeeded; i++, left++ ) {\n\t\tconst block = blocksToSync[ left ];\n\t\tconst yblock = yblocks.get( left );\n\n\t\tObject.entries( block ).forEach( ( [ key, value ] ) => {\n\t\t\tswitch ( key ) {\n\t\t\t\tcase 'attributes': {\n\t\t\t\t\tconst currentAttributes = yblock.get( key );\n\n\t\t\t\t\t// If attributes are not set on the yblock, use the new values.\n\t\t\t\t\tif ( ! currentAttributes ) {\n\t\t\t\t\t\tyblock.set(\n\t\t\t\t\t\t\tkey,\n\t\t\t\t\t\t\tcreateNewYAttributeMap( block.name, value )\n\t\t\t\t\t\t);\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tObject.entries( value ).forEach(\n\t\t\t\t\t\t( [ attributeName, attributeValue ] ) => {\n\t\t\t\t\t\t\tconst currentAttribute =\n\t\t\t\t\t\t\t\tcurrentAttributes?.get( attributeName );\n\n\t\t\t\t\t\t\tconst isExpectedType = isExpectedAttributeType(\n\t\t\t\t\t\t\t\tblock.name,\n\t\t\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\t\t\tcurrentAttribute\n\t\t\t\t\t\t\t);\n\n\t\t\t\t\t\t\t// Y types (Y.Text, Y.Array, Y.Map) cannot be\n\t\t\t\t\t\t\t// compared with fastDeepEqual against plain values.\n\t\t\t\t\t\t\t// Delegate to mergeYValue which handles no-op\n\t\t\t\t\t\t\t// detection at the edges.\n\t\t\t\t\t\t\tconst isYType =\n\t\t\t\t\t\t\t\tcurrentAttribute instanceof Y.AbstractType;\n\n\t\t\t\t\t\t\tconst isAttributeChanged =\n\t\t\t\t\t\t\t\t! isExpectedType ||\n\t\t\t\t\t\t\t\tisYType ||\n\t\t\t\t\t\t\t\t! fastDeepEqual(\n\t\t\t\t\t\t\t\t\tcurrentAttribute,\n\t\t\t\t\t\t\t\t\tattributeValue\n\t\t\t\t\t\t\t\t);\n\n\t\t\t\t\t\t\tif ( isAttributeChanged ) {\n\t\t\t\t\t\t\t\tupdateYBlockAttribute(\n\t\t\t\t\t\t\t\t\tblock.name,\n\t\t\t\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\t\t\t\tattributeValue,\n\t\t\t\t\t\t\t\t\tcurrentAttributes,\n\t\t\t\t\t\t\t\t\tcursorPosition\n\t\t\t\t\t\t\t\t);\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\n\t\t\t\t\t// Delete any attributes that are no longer present.\n\t\t\t\t\tcurrentAttributes.forEach(\n\t\t\t\t\t\t( _attrValue: unknown, attrName: string ) => {\n\t\t\t\t\t\t\tif ( ! value.hasOwnProperty( attrName ) ) {\n\t\t\t\t\t\t\t\tcurrentAttributes.delete( attrName );\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tcase 'innerBlocks': {\n\t\t\t\t\t// Recursively merge innerBlocks\n\t\t\t\t\tlet yInnerBlocks = yblock.get( key );\n\n\t\t\t\t\tif ( ! ( yInnerBlocks instanceof Y.Array ) ) {\n\t\t\t\t\t\tyInnerBlocks = new Y.Array< YBlock >();\n\t\t\t\t\t\tyblock.set( key, yInnerBlocks );\n\t\t\t\t\t}\n\n\t\t\t\t\tmergeCrdtBlocks(\n\t\t\t\t\t\tyInnerBlocks,\n\t\t\t\t\t\tvalue ?? [],\n\t\t\t\t\t\tcursorPosition\n\t\t\t\t\t);\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tdefault:\n\t\t\t\t\tif ( ! fastDeepEqual( block[ key ], yblock.get( key ) ) ) {\n\t\t\t\t\t\tyblock.set( key, value );\n\t\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t\tyblock.forEach( ( _v, k ) => {\n\t\t\tif ( ! block.hasOwnProperty( k ) ) {\n\t\t\t\tyblock.delete( k );\n\t\t\t}\n\t\t} );\n\t}\n\n\t// deletes\n\tyblocks.delete( left, numOfDeletionsNeeded );\n\n\t// inserts\n\tfor ( let i = 0; i < numOfInsertionsNeeded; i++, left++ ) {\n\t\tconst newBlock = [ createNewYBlock( blocksToSync[ left ] ) ];\n\n\t\tyblocks.insert( left, newBlock );\n\t}\n\n\t// remove duplicate clientids\n\tconst knownClientIds = new Set< string >();\n\tfor ( let j = 0; j < yblocks.length; j++ ) {\n\t\tconst yblock: YBlock = yblocks.get( j );\n\n\t\tlet clientId = yblock.get( 'clientId' );\n\n\t\tif ( ! clientId ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tif ( knownClientIds.has( clientId ) ) {\n\t\t\tclientId = uuidv4();\n\t\t\tyblock.set( 'clientId', clientId );\n\t\t}\n\t\tknownClientIds.add( clientId );\n\t}\n}\n\n/**\n * Compare a plain array element against a Y.Map element for equality.\n * Used by the left-right sweep diff in mergeYArray.\n *\n * @param newElement The plain object from the incoming array.\n * @param yElement   The Y.Map element from the existing Y.Array.\n * @return True if the elements are deeply equal.\n */\nfunction areArrayElementsEqual(\n\tnewElement: unknown,\n\tyElement: unknown\n): boolean {\n\tif ( yElement instanceof Y.Map && isRecord( newElement ) ) {\n\t\treturn fastDeepEqual( newElement, yElement.toJSON() );\n\t}\n\n\treturn fastDeepEqual( newElement, yElement );\n}\n\n/**\n * Merge an incoming plain array into an existing Y.Array in-place.\n *\n * Uses the same left-right sweep diff approach as mergeCrdtBlocks:\n * equal elements are skipped from both ends, then the middle section\n * is updated, deleted, or inserted as needed. This preserves existing\n * Y.Map/Y.Text objects for unchanged elements, so concurrent edits\n * to those elements are not lost.\n *\n * @param yArray         The existing Y.Array to update.\n * @param newValue       The new plain array to merge into the Y.Array.\n * @param schema         The attribute schema (must have `query`).\n * @param cursorPosition The local cursor position for rich-text delta merges.\n */\nfunction mergeYArray(\n\tyArray: Y.Array< unknown >,\n\tnewValue: unknown[],\n\tschema: BlockAttributeSchema,\n\tcursorPosition: number | null\n): void {\n\tif ( ! schema.query ) {\n\t\treturn;\n\t}\n\n\tconst query = schema.query;\n\tconst numOfCommonEntries = Math.min( newValue.length, yArray.length );\n\n\tlet left = 0;\n\tlet right = 0;\n\n\t// Skip equal elements from left.\n\tfor (\n\t\t;\n\t\tleft < numOfCommonEntries &&\n\t\tareArrayElementsEqual( newValue[ left ], yArray.get( left ) );\n\t\tleft++\n\t) {\n\t\t/* nop */\n\t}\n\n\t// Skip equal elements from right.\n\tfor (\n\t\t;\n\t\tright < numOfCommonEntries - left &&\n\t\tareArrayElementsEqual(\n\t\t\tnewValue[ newValue.length - right - 1 ],\n\t\t\tyArray.get( yArray.length - right - 1 )\n\t\t);\n\t\tright++\n\t) {\n\t\t/* nop */\n\t}\n\n\t// Updates: merge changed elements in-place.\n\tconst numOfUpdatesNeeded = numOfCommonEntries - left - right;\n\n\tfor ( let i = 0; i < numOfUpdatesNeeded; i++ ) {\n\t\tconst currentElement = yArray.get( left + i );\n\t\tconst newElement = newValue[ left + i ];\n\n\t\tif ( currentElement instanceof Y.Map && isRecord( newElement ) ) {\n\t\t\tmergeYMapValues(\n\t\t\t\tcurrentElement,\n\t\t\t\tnewElement,\n\t\t\t\tquery,\n\t\t\t\tcursorPosition\n\t\t\t);\n\t\t} else {\n\t\t\t// Element is the wrong type (e.g. partial migration) or the\n\t\t\t// incoming value is not an object. 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}