@wordpress/block-editor/build-module/components/list-view/use-list-view-block-indexes.js

Generic block editor.

/**
 * WordPress dependencies
 */
import { useMemo } from '@wordpress/element';
export default function useListViewBlockIndexes(blocks) {
  const blockIndexes = useMemo(() => {
    const indexes = {};
    let currentGlobalIndex = 0;
    const traverseBlocks = blockList => {
      blockList.forEach(block => {
        indexes[block.clientId] = currentGlobalIndex;
        currentGlobalIndex++;
        if (block.innerBlocks.length > 0) {
          traverseBlocks(block.innerBlocks);
        }
      });
    };
    traverseBlocks(blocks);
    return indexes;
  }, [blocks]);
  return blockIndexes;
}
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