@atlaskit/editor-plugin-block-menu/dist/es2019/editor-commands/is-empty-line.js

BlockMenu plugin for @atlaskit/editor-core

/** True when there is one source node and it is an empty or whitespace-only paragraph or heading. */
export const isEmptyLine = sourceNodes => {
  if (sourceNodes.length !== 1) {
    return false;
  }
  const source = sourceNodes[0];
  const {
    heading,
    paragraph
  } = source.type.schema.nodes;
  return (source.type === paragraph || source.type === heading) && (source.content.size === 0 || source.textContent.trim() === '');
};