remark-widow

index.js

const visit = require('unist-util-visit')

module.exports = () => (tree, file) => {
  visit(tree, 'heading', node => {
    console.log('node: ', node);
    visit(node, 'text', textNode => {
      console.log('textNode: ', textNode);
      const text = textNode.value ? textNode.value.trim() : ''
      // const textNoWidows = text.replace(/\s+([\S]*)(\s*)$/gm, "\xA0$1$2");
      // const textNoWidows = text.replace(/\s([^\s]*)(\s+)?$/, ' $1');
      const textNoWidows = text.replace(/\s([^\s]*)(\s+)?$/, '\xA0$1');
      console.log('textNoWidows: ', textNoWidows);
      // const textNoWidows = text.replace(/\s([^\s]*)(\s+)?$/, ' $1');
      textNode.value = textNoWidows
    })
  })
}