@wordpress/block-editor/build-module/utils/selection.js

Generic block editor.

/**
 * A robust way to retain selection position through various
 * transforms is to insert a special character at the position and
 * then recover it.
 */
export const START_OF_SELECTED_AREA = '\u0086';
/**
 * Retrieve the block attribute that contains the selection position.
 *
 * @param {Object} blockAttributes Block attributes.
 * @return {string|void} The name of the block attribute that was previously selected.
 */

export function retrieveSelectedAttribute(blockAttributes) {
  if (!blockAttributes) {
    return;
  }

  return Object.keys(blockAttributes).find(name => {
    const value = blockAttributes[name];
    return typeof value === 'string' && value.indexOf(START_OF_SELECTED_AREA) !== -1;
  });
}
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