@wordpress/compose/build/hooks/use-async-list/index.cjs.map

WordPress higher-order components (HOCs).

{
  "version": 3,
  "sources": ["../../../src/hooks/use-async-list/index.ts"],
  "sourcesContent": ["/**\n * WordPress dependencies\n */\nimport { flushSync, useEffect, useState } from '@wordpress/element';\nimport { createQueue } from '@wordpress/priority-queue';\n\ntype AsyncListConfig = {\n\tstep: number;\n};\n\n/**\n * Returns the first items from list that are present on state.\n *\n * @param list  New array.\n * @param state Current state.\n * @return First items present in state.\n */\nfunction getFirstItemsPresentInState< T >( list: T[], state: T[] ): T[] {\n\tconst firstItems = [];\n\n\tfor ( let i = 0; i < list.length; i++ ) {\n\t\tconst item = list[ i ];\n\t\tif ( ! state.includes( item ) ) {\n\t\t\tbreak;\n\t\t}\n\n\t\tfirstItems.push( item );\n\t}\n\n\treturn firstItems;\n}\n\n/**\n * React hook returns an array which items get asynchronously appended from a source array.\n * This behavior is useful if we want to render a list of items asynchronously for performance reasons.\n *\n * @param list   Source array.\n * @param config Configuration object.\n *\n * @return Async array.\n */\nfunction useAsyncList< T >(\n\tlist: T[],\n\tconfig: AsyncListConfig = { step: 1 }\n): T[] {\n\tconst { step = 1 } = config;\n\tconst [ current, setCurrent ] = useState< T[] >( [] );\n\n\tuseEffect( () => {\n\t\t// On reset, we keep the first items that were previously rendered.\n\t\tlet firstItems = getFirstItemsPresentInState( list, current );\n\t\tif ( firstItems.length < step ) {\n\t\t\tfirstItems = firstItems.concat(\n\t\t\t\tlist.slice( firstItems.length, step )\n\t\t\t);\n\t\t}\n\t\tsetCurrent( firstItems );\n\n\t\tconst asyncQueue = createQueue();\n\t\tfor ( let i = firstItems.length; i < list.length; i += step ) {\n\t\t\tasyncQueue.add( {}, () => {\n\t\t\t\tflushSync( () => {\n\t\t\t\t\tsetCurrent( ( state ) => [\n\t\t\t\t\t\t...state,\n\t\t\t\t\t\t...list.slice( i, i + step ),\n\t\t\t\t\t] );\n\t\t\t\t} );\n\t\t\t} );\n\t\t}\n\n\t\treturn () => asyncQueue.reset();\n\t}, [ list ] );\n\n\treturn current;\n}\n\nexport default useAsyncList;\n"],
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