@wordpress/block-editor/build-module/components/block-list/block-html.js

Generic block editor.

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

/**
 * External dependencies
 */
import TextareaAutosize from 'react-autosize-textarea';
/**
 * WordPress dependencies
 */

import { useEffect, useState } from '@wordpress/element';
import { useSelect, useDispatch } from '@wordpress/data';
import { getBlockAttributes, getBlockContent, getBlockType, isValidBlockContent, getSaveContent } from '@wordpress/blocks';
/**
 * Internal dependencies
 */

import { store as blockEditorStore } from '../../store';

function BlockHTML({
  clientId
}) {
  const [html, setHtml] = useState('');
  const block = useSelect(select => select(blockEditorStore).getBlock(clientId), [clientId]);
  const {
    updateBlock
  } = useDispatch(blockEditorStore);

  const onChange = () => {
    const blockType = getBlockType(block.name);
    const attributes = getBlockAttributes(blockType, html, block.attributes); // If html is empty  we reset the block to the default HTML and mark it as valid to avoid triggering an error

    const content = html ? html : getSaveContent(blockType, attributes);
    const isValid = html ? isValidBlockContent(blockType, attributes, content) : true;
    updateBlock(clientId, {
      attributes,
      originalContent: content,
      isValid
    }); // Ensure the state is updated if we reset so it displays the default content

    if (!html) {
      setHtml({
        content
      });
    }
  };

  useEffect(() => {
    setHtml(getBlockContent(block));
  }, [block]);
  return createElement(TextareaAutosize, {
    className: "block-editor-block-list__block-html-textarea",
    value: html,
    onBlur: onChange,
    onChange: event => setHtml(event.target.value)
  });
}

export default BlockHTML;
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