bot/packages/lib/markdown/convertRichTextToMarkdown.ts

import { TElement } from '@udecode/plate-common'
import serialize from './serializer/serialize'
import { defaultNodeTypes } from './serializer/ast-types'

export const convertRichTextToMarkdown = (
  richText: TElement[],
  options?: { flavour?: 'common' | 'whatsapp' }
) => {
  const test = richText
    .reduce<string[]>((acc, node) => {
      if (node.type === 'variable') {
        return [
          ...acc,
          ...node.children.reduce<string[]>((acc, node) => {
            const serializedElement = serialize(node, {
              nodeTypes: defaultNodeTypes,
              flavour: options?.flavour,
            }) as string
            if (!serializedElement || serializedElement === '<br>\n\n')
              return [...acc, '\n']
            return [...acc, serializedElement]
          }, []),
        ]
      }
      const serializedElement = serialize(node, {
        nodeTypes: defaultNodeTypes,
        flavour: options?.flavour,
      })
      if (!serializedElement || serializedElement === '<br>\n\n')
        return [...acc, '\n']
      return [...acc, serializedElement]
    }, [])
    .join('')

  return test.endsWith('\n') ? test.slice(0, -1) : test
}