An Eleventy filter for automatically converting quotes to smartquotes.

smartquotes.js

  eleventyConfig.addFilter("smartquotes", (post) => {
    const hawaii = new RegExp(/Hawai'i/g);
    const slang = new RegExp(/'(cause|em|til|twas)/g);
    const apostrophes = new RegExp(/(\b)'(\b)/g);
    const years = new RegExp(/(\s)'(\d)/g);
    const openDoubles = new RegExp(/(\s|^|>)"/g);
    const closeDoubles = new RegExp(/"/g);
    const openSingles = new RegExp(/(\s|^|>)'/g);
    const closeSingles = new RegExp(/'/g);
    return post
      .replace(hawaii, "Hawaiʻi").replace(slang, "’$1")
      .replace(apostrophes, "$1’$2").replace(years, "$1’$2")
      .replace(openDoubles, "$1“").replace(closeDoubles, "”")
      .replace(openSingles, "$1‘").replace(closeSingles, "’");
  });