eleventy.config.js

import markdownIt from "markdown-it";
import markdownItAnchor from "markdown-it-anchor";
import { DateTime } from "luxon";

const TIME_ZONE = "America/New_York";

export default async function (eleventyConfig) {
  eleventyConfig.setOutputDirectory("out");

  // Eleventy doesn't need to touch these
  eleventyConfig.addPassthroughCopy("css");
  eleventyConfig.addPassthroughCopy("js");
  eleventyConfig.addPassthroughCopy("images");
  eleventyConfig.addPassthroughCopy("**/*.sh");

  // I want to link to different sections
  eleventyConfig.setLibrary("md", markdownIt({html: true, linkify: true}).use(markdownItAnchor, {level: [2, 3, 4]}));

  // Fixes date parsing to use the correct time zone (this is horrible)
  eleventyConfig.addDateParsing(function(dateValue) {
    let localDate;
    if(dateValue instanceof Date) {
      localDate = DateTime.fromJSDate(dateValue, {zone: "utc" }).setZone(TIME_ZONE, { keepLocalTime: true });
    } else if(typeof dateValue == "string") {
      localDate = DateTime.fromISO(dateValue, { zone: TIME_ZONE });
    }
    if (localDate?.isValid === false) {
      throw new Error(`Invalid \`date\` value (${dateValue}) is invalid for ${this.page.inputPath}: ${localDate.invalidReason}`);
    }
    return localDate;
  });
  eleventyConfig.addFilter("dateOnly", async function (dateVal, locale = "en-us") {
    var date = new Date(dateVal);
    const options = { year: "numeric", month: "short", day: "numeric" };
    return date.toLocaleDateString(locale, options);
  });

  eleventyConfig.setFrontMatterParsingOptions({
    excerpt: true,
    excerpt_separator: "<!-- excerpt -->",
  });
}