@wordpress/block-editor/build-module/components/block-navigation/indentation.js

Generic block editor.

import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import { times } from 'lodash';
import classnames from 'classnames';
const lineClassName = 'block-editor-block-navigator-indentation';
export default function Indentation({
  level
}) {
  return times(level - 1, index => {
    // The first 'level' that has an indentation is level 2.
    // Add 2 to the zero-based index below to reflect that.
    const currentLevel = index + 2;
    const hasItem = currentLevel === level;
    return createElement("div", {
      key: index,
      "aria-hidden": "true",
      className: classnames(lineClassName, {
        'has-item': hasItem
      })
    });
  });
}
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