@atlaskit/editor-plugin-list/dist/es2019/pm-plugins/commands/isFirstChildOfParent.js

List plugin for @atlaskit/editor-core

import { GapCursorSelection } from '@atlaskit/editor-common/selection';
export const isFirstChildOfParent = state => {
  const {
    $from
  } = state.selection;
  return $from.depth > 1 ? state.selection instanceof GapCursorSelection && $from.parentOffset === 0 || $from.index($from.depth - 1) === 0 : true;
};