runmd.onRequire = function (path) {
  if (path === "njoi") {
    return "./lib/njoi.js";
  } else {
    return path;
  }
};

README

An experiment to render a sensible JSON-alike structure from the Joi definition to be copied in to (Github) fenced markdown sections.

If this is the Joi schema you're defining:

const Joi = require("joi");
const schema = Joi.object()
  .keys({
    name: Joi.string().description("The given name").required(),
    age: Joi.number().description("The age").default(5),
    tags: Joi.array()
      .items(Joi.string())
      .description("A set of tags to be a associated"),
    address: Joi.object()
      .keys({
        street: Joi.string().description("The street"),
        houseNumber: Joi.string().description("The housenumber."),
        type: Joi.string().valid("condo", "appartment", "mansion"),
        city: Joi.string().description("The city"),
      })
      .label("Address"),
    education: Joi.array().items(
      Joi.object()
        .keys({
          school: Joi.string().description("The school attended"),
          degree: Joi.boolean().description("Got the degree or not"),
        })
        .label("Education")
    ),
  })
  .label("Person");

… then you will be able to generate something a little easier on the eyes using:

const njoi = require("njoi");
console.log(njoi.jsonish()(schema));

Or one including comments:

console.log(njoi.jsonish({ comments: true })(schema));

Or a markdown breakdown using:

console.log(njoi.markdown()(schema));

Or a JSDoc breakdown using:

console.log(njoi.jsdoc()(schema));

If you want, then can pass in a callback to have the ability to render some additional lines:

const envVariable = (node, context) => {
  if (context && context.indexOf("[]") < 0) {
    const name = context
      .split(".")
      .map((str) => str.toUpperCase())
      .join("_");
    return `Use the \`${name}\` environment variable to override this setting.`;
  } else {
    return void 0;
  }
};

console.log(njoi.markdown({ extra: envVariable })(schema));