get code comments

getComments.js

const acorn = require('acorn');
const json5 = require('json5');

const getComments = (input) => {
  const opts = {
    onComment: []
  };

  try {
    const ast = acorn.parse(input, opts);
  } catch (e) {
    return {};
  }

  const comments = opts.onComment.map(comment => {
    try {
      return json5.parse(`{${comment.value}}`);
    } catch (e) {
      return {};
    }
  });

  return comments.reduce((o, i) => Object.assign(o, i), {});
}