mdlint.js

const glob = require('glob');
const markdownlint = require('markdownlint');

const config = {
  'default': true,
  'line_length': false,
  'no-emphasis-as-header': false
}

const files = glob.sync('**/*.md', { ignore: '**/node_modules/**' });

markdownlint({ files, config }, (err, result) => {
  if (!err) {
    const resultString = result.toString();
    console.log('== Linting Markdown Files...');
    if (resultString) {
      console.log(resultString);
      process.exit(1);
    } else {
      console.log('== OK!');
    }
  }
});