Creating a React/Gatsby component to limit text to ~190 characters from an array field

const BlockExcerpt = ({ blocks }) => {
  // console.log(blocks)

  const blockText = blocks.map(block => {
    return block.children.map(blockPart => {
      return blockPart.text
    })
  });

  const flat = blockText.flat(2)
  const joined = flat.join("")
  const truncated = joined.substring(0,190)
  return <p className={typo.p}>{truncated}&hellip;</p>
}

export default BlockExcerpt