diff --git a/jest/vendor/unified@10.1.2.js b/jest/vendor/unified@10.1.2.js
new file mode 100644
index 0000000000..0a77904289
--- /dev/null
+++ b/jest/vendor/unified@10.1.2.js
@@ -0,0 +1,779 @@
+var __create = Object.create;
+var __defProp = Object.defineProperty;
+var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __getProtoOf = Object.getPrototypeOf;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __commonJS = (cb, mod) => function __require() {
+  return mod || (0, cb[__getOwnPropNames(cb)[0]])((mod = { exports: {} }).exports, mod), mod.exports;
+};
+var __export = (target, all) => {
+  for (var name in all)
+    __defProp(target, name, { get: all[name], enumerable: true });
+};
+var __copyProps = (to, from, except, desc) => {
+  if (from && typeof from === "object" || typeof from === "function") {
+    for (let key of __getOwnPropNames(from))
+      if (!__hasOwnProp.call(to, key) && key !== except)
+        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
+  }
+  return to;
+};
+var __toESM = (mod, isNodeMode, target) => (target = mod != null ? __create(__getProtoOf(mod)) : {}, __copyProps(
+  isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target,
+  mod
+));
+var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
+
+// node_modules/is-buffer/index.js
+var require_is_buffer = __commonJS({
+  "node_modules/is-buffer/index.js"(exports, module2) {
+    module2.exports = function isBuffer2(obj) {
+      return obj != null && obj.constructor != null && typeof obj.constructor.isBuffer === "function" && obj.constructor.isBuffer(obj);
+    };
+  }
+});
+
+// node_modules/extend/index.js
+var require_extend = __commonJS({
+  "node_modules/extend/index.js"(exports, module2) {
+    "use strict";
+    var hasOwn = Object.prototype.hasOwnProperty;
+    var toStr = Object.prototype.toString;
+    var defineProperty = Object.defineProperty;
+    var gOPD = Object.getOwnPropertyDescriptor;
+    var isArray = function isArray2(arr) {
+      if (typeof Array.isArray === "function") {
+        return Array.isArray(arr);
+      }
+      return toStr.call(arr) === "[object Array]";
+    };
+    var isPlainObject2 = function isPlainObject3(obj) {
+      if (!obj || toStr.call(obj) !== "[object Object]") {
+        return false;
+      }
+      var hasOwnConstructor = hasOwn.call(obj, "constructor");
+      var hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, "isPrototypeOf");
+      if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
+        return false;
+      }
+      var key;
+      for (key in obj) {
+      }
+      return typeof key === "undefined" || hasOwn.call(obj, key);
+    };
+    var setProperty = function setProperty2(target, options) {
+      if (defineProperty && options.name === "__proto__") {
+        defineProperty(target, options.name, {
+          enumerable: true,
+          configurable: true,
+          value: options.newValue,
+          writable: true
+        });
+      } else {
+        target[options.name] = options.newValue;
+      }
+    };
+    var getProperty = function getProperty2(obj, name) {
+      if (name === "__proto__") {
+        if (!hasOwn.call(obj, name)) {
+          return void 0;
+        } else if (gOPD) {
+          return gOPD(obj, name).value;
+        }
+      }
+      return obj[name];
+    };
+    module2.exports = function extend2() {
+      var options, name, src, copy, copyIsArray, clone;
+      var target = arguments[0];
+      var i = 1;
+      var length = arguments.length;
+      var deep = false;
+      if (typeof target === "boolean") {
+        deep = target;
+        target = arguments[1] || {};
+        i = 2;
+      }
+      if (target == null || typeof target !== "object" && typeof target !== "function") {
+        target = {};
+      }
+      for (; i < length; ++i) {
+        options = arguments[i];
+        if (options != null) {
+          for (name in options) {
+            src = getProperty(target, name);
+            copy = getProperty(options, name);
+            if (target !== copy) {
+              if (deep && copy && (isPlainObject2(copy) || (copyIsArray = isArray(copy)))) {
+                if (copyIsArray) {
+                  copyIsArray = false;
+                  clone = src && isArray(src) ? src : [];
+                } else {
+                  clone = src && isPlainObject2(src) ? src : {};
+                }
+                setProperty(target, { name, newValue: extend2(deep, clone, copy) });
+              } else if (typeof copy !== "undefined") {
+                setProperty(target, { name, newValue: copy });
+              }
+            }
+          }
+        }
+      }
+      return target;
+    };
+  }
+});
+
+// node_modules/unified/index.js
+var unified_exports = {};
+__export(unified_exports, {
+  unified: () => unified1012
+});
+module.exports = __toCommonJS(unified_exports);
+
+// node_modules/bail/index.js
+function bail(error) {
+  if (error) {
+    throw error;
+  }
+}
+
+// node_modules/unified/lib/index.js
+var import_is_buffer2 = __toESM(require_is_buffer(), 1);
+var import_extend = __toESM(require_extend(), 1);
+
+// node_modules/unified/node_modules/is-plain-obj/index.js
+function isPlainObject(value) {
+  if (typeof value !== "object" || value === null) {
+    return false;
+  }
+  const prototype = Object.getPrototypeOf(value);
+  return (prototype === null || prototype === Object.prototype || Object.getPrototypeOf(prototype) === null) && !(Symbol.toStringTag in value) && !(Symbol.iterator in value);
+}
+
+// node_modules/trough/index.js
+function trough() {
+  const fns = [];
+  const pipeline = { run, use };
+  return pipeline;
+  function run(...values) {
+    let middlewareIndex = -1;
+    const callback = values.pop();
+    if (typeof callback !== "function") {
+      throw new TypeError("Expected function as last argument, not " + callback);
+    }
+    next(null, ...values);
+    function next(error, ...output) {
+      const fn = fns[++middlewareIndex];
+      let index2 = -1;
+      if (error) {
+        callback(error);
+        return;
+      }
+      while (++index2 < values.length) {
+        if (output[index2] === null || output[index2] === void 0) {
+          output[index2] = values[index2];
+        }
+      }
+      values = output;
+      if (fn) {
+        wrap(fn, next)(...output);
+      } else {
+        callback(null, ...output);
+      }
+    }
+  }
+  function use(middelware) {
+    if (typeof middelware !== "function") {
+      throw new TypeError(
+        "Expected `middelware` to be a function, not " + middelware
+      );
+    }
+    fns.push(middelware);
+    return pipeline;
+  }
+}
+function wrap(middleware, callback) {
+  let called;
+  return wrapped;
+  function wrapped(...parameters) {
+    const fnExpectsCallback = middleware.length > parameters.length;
+    let result;
+    if (fnExpectsCallback) {
+      parameters.push(done);
+    }
+    try {
+      result = middleware.apply(this, parameters);
+    } catch (error) {
+      const exception = error;
+      if (fnExpectsCallback && called) {
+        throw exception;
+      }
+      return done(exception);
+    }
+    if (!fnExpectsCallback) {
+      if (result instanceof Promise) {
+        result.then(then, done);
+      } else if (result instanceof Error) {
+        done(result);
+      } else {
+        then(result);
+      }
+    }
+  }
+  function done(error, ...output) {
+    if (!called) {
+      called = true;
+      callback(error, ...output);
+    }
+  }
+  function then(value) {
+    done(null, value);
+  }
+}
+
+// node_modules/vfile/lib/index.js
+var import_is_buffer = __toESM(require_is_buffer(), 1);
+
+// node_modules/unist-util-stringify-position/index.js
+function stringifyPosition(value) {
+  if (!value || typeof value !== "object") {
+    return "";
+  }
+  if ("position" in value || "type" in value) {
+    return position(value.position);
+  }
+  if ("start" in value || "end" in value) {
+    return position(value);
+  }
+  if ("line" in value || "column" in value) {
+    return point(value);
+  }
+  return "";
+}
+function point(point2) {
+  return index(point2 && point2.line) + ":" + index(point2 && point2.column);
+}
+function position(pos) {
+  return point(pos && pos.start) + "-" + point(pos && pos.end);
+}
+function index(value) {
+  return value && typeof value === "number" ? value : 1;
+}
+
+// node_modules/vfile-message/index.js
+var VFileMessage = class extends Error {
+  constructor(reason, place, origin) {
+    const parts = [null, null];
+    let position2 = {
+      start: { line: null, column: null },
+      end: { line: null, column: null }
+    };
+    super();
+    if (typeof place === "string") {
+      origin = place;
+      place = void 0;
+    }
+    if (typeof origin === "string") {
+      const index2 = origin.indexOf(":");
+      if (index2 === -1) {
+        parts[1] = origin;
+      } else {
+        parts[0] = origin.slice(0, index2);
+        parts[1] = origin.slice(index2 + 1);
+      }
+    }
+    if (place) {
+      if ("type" in place || "position" in place) {
+        if (place.position) {
+          position2 = place.position;
+        }
+      } else if ("start" in place || "end" in place) {
+        position2 = place;
+      } else if ("line" in place || "column" in place) {
+        position2.start = place;
+      }
+    }
+    this.name = stringifyPosition(place) || "1:1";
+    this.message = typeof reason === "object" ? reason.message : reason;
+    this.stack = "";
+    if (typeof reason === "object" && reason.stack) {
+      this.stack = reason.stack;
+    }
+    this.reason = this.message;
+    this.fatal;
+    this.line = position2.start.line;
+    this.column = position2.start.column;
+    this.position = position2;
+    this.source = parts[0];
+    this.ruleId = parts[1];
+    this.file;
+    this.actual;
+    this.expected;
+    this.url;
+    this.note;
+  }
+};
+VFileMessage.prototype.file = "";
+VFileMessage.prototype.name = "";
+VFileMessage.prototype.reason = "";
+VFileMessage.prototype.message = "";
+VFileMessage.prototype.stack = "";
+VFileMessage.prototype.fatal = null;
+VFileMessage.prototype.column = null;
+VFileMessage.prototype.line = null;
+VFileMessage.prototype.source = null;
+VFileMessage.prototype.ruleId = null;
+VFileMessage.prototype.position = null;
+
+// node_modules/vfile/lib/minpath.js
+var import_path = __toESM(require("path"), 1);
+
+// node_modules/vfile/lib/minproc.js
+var import_process = __toESM(require("process"), 1);
+
+// node_modules/vfile/lib/minurl.js
+var import_url = require("url");
+
+// node_modules/vfile/lib/minurl.shared.js
+function isUrl(fileURLOrPath) {
+  return fileURLOrPath !== null && typeof fileURLOrPath === "object" && fileURLOrPath.href && fileURLOrPath.origin;
+}
+
+// node_modules/vfile/lib/index.js
+var order = ["history", "path", "basename", "stem", "extname", "dirname"];
+var VFile = class {
+  constructor(value) {
+    let options;
+    if (!value) {
+      options = {};
+    } else if (typeof value === "string" || (0, import_is_buffer.default)(value)) {
+      options = { value };
+    } else if (isUrl(value)) {
+      options = { path: value };
+    } else {
+      options = value;
+    }
+    this.data = {};
+    this.messages = [];
+    this.history = [];
+    this.cwd = import_process.default.cwd();
+    this.value;
+    this.stored;
+    this.result;
+    this.map;
+    let index2 = -1;
+    while (++index2 < order.length) {
+      const prop2 = order[index2];
+      if (prop2 in options && options[prop2] !== void 0) {
+        this[prop2] = prop2 === "history" ? [...options[prop2]] : options[prop2];
+      }
+    }
+    let prop;
+    for (prop in options) {
+      if (!order.includes(prop))
+        this[prop] = options[prop];
+    }
+  }
+  get path() {
+    return this.history[this.history.length - 1];
+  }
+  set path(path) {
+    if (isUrl(path)) {
+      path = (0, import_url.fileURLToPath)(path);
+    }
+    assertNonEmpty(path, "path");
+    if (this.path !== path) {
+      this.history.push(path);
+    }
+  }
+  get dirname() {
+    return typeof this.path === "string" ? import_path.default.dirname(this.path) : void 0;
+  }
+  set dirname(dirname) {
+    assertPath(this.basename, "dirname");
+    this.path = import_path.default.join(dirname || "", this.basename);
+  }
+  get basename() {
+    return typeof this.path === "string" ? import_path.default.basename(this.path) : void 0;
+  }
+  set basename(basename) {
+    assertNonEmpty(basename, "basename");
+    assertPart(basename, "basename");
+    this.path = import_path.default.join(this.dirname || "", basename);
+  }
+  get extname() {
+    return typeof this.path === "string" ? import_path.default.extname(this.path) : void 0;
+  }
+  set extname(extname) {
+    assertPart(extname, "extname");
+    assertPath(this.dirname, "extname");
+    if (extname) {
+      if (extname.charCodeAt(0) !== 46) {
+        throw new Error("`extname` must start with `.`");
+      }
+      if (extname.includes(".", 1)) {
+        throw new Error("`extname` cannot contain multiple dots");
+      }
+    }
+    this.path = import_path.default.join(this.dirname, this.stem + (extname || ""));
+  }
+  get stem() {
+    return typeof this.path === "string" ? import_path.default.basename(this.path, this.extname) : void 0;
+  }
+  set stem(stem) {
+    assertNonEmpty(stem, "stem");
+    assertPart(stem, "stem");
+    this.path = import_path.default.join(this.dirname || "", stem + (this.extname || ""));
+  }
+  toString(encoding) {
+    return (this.value || "").toString(encoding);
+  }
+  message(reason, place, origin) {
+    const message = new VFileMessage(reason, place, origin);
+    if (this.path) {
+      message.name = this.path + ":" + message.name;
+      message.file = this.path;
+    }
+    message.fatal = false;
+    this.messages.push(message);
+    return message;
+  }
+  info(reason, place, origin) {
+    const message = this.message(reason, place, origin);
+    message.fatal = null;
+    return message;
+  }
+  fail(reason, place, origin) {
+    const message = this.message(reason, place, origin);
+    message.fatal = true;
+    throw message;
+  }
+};
+function assertPart(part, name) {
+  if (part && part.includes(import_path.default.sep)) {
+    throw new Error(
+      "`" + name + "` cannot be a path: did not expect `" + import_path.default.sep + "`"
+    );
+  }
+}
+function assertNonEmpty(part, name) {
+  if (!part) {
+    throw new Error("`" + name + "` cannot be empty");
+  }
+}
+function assertPath(path, name) {
+  if (!path) {
+    throw new Error("Setting `" + name + "` requires `path` to be set too");
+  }
+}
+
+// node_modules/unified/lib/index.js
+var unified1012 = base().freeze();
+var own = {}.hasOwnProperty;
+function base() {
+  const transformers = trough();
+  const attachers = [];
+  let namespace = {};
+  let frozen;
+  let freezeIndex = -1;
+  processor.data = data;
+  processor.Parser = void 0;
+  processor.Compiler = void 0;
+  processor.freeze = freeze;
+  processor.attachers = attachers;
+  processor.use = use;
+  processor.parse = parse;
+  processor.stringify = stringify;
+  processor.run = run;
+  processor.runSync = runSync;
+  processor.process = process;
+  processor.processSync = processSync;
+  return processor;
+  function processor() {
+    const destination = base();
+    let index2 = -1;
+    while (++index2 < attachers.length) {
+      destination.use(...attachers[index2]);
+    }
+    destination.data((0, import_extend.default)(true, {}, namespace));
+    return destination;
+  }
+  function data(key, value) {
+    if (typeof key === "string") {
+      if (arguments.length === 2) {
+        assertUnfrozen("data", frozen);
+        namespace[key] = value;
+        return processor;
+      }
+      return own.call(namespace, key) && namespace[key] || null;
+    }
+    if (key) {
+      assertUnfrozen("data", frozen);
+      namespace = key;
+      return processor;
+    }
+    return namespace;
+  }
+  function freeze() {
+    if (frozen) {
+      return processor;
+    }
+    while (++freezeIndex < attachers.length) {
+      const [attacher, ...options] = attachers[freezeIndex];
+      if (options[0] === false) {
+        continue;
+      }
+      if (options[0] === true) {
+        options[0] = void 0;
+      }
+      const transformer = attacher.call(processor, ...options);
+      if (typeof transformer === "function") {
+        transformers.use(transformer);
+      }
+    }
+    frozen = true;
+    freezeIndex = Number.POSITIVE_INFINITY;
+    return processor;
+  }
+  function use(value, ...options) {
+    let settings;
+    assertUnfrozen("use", frozen);
+    if (value === null || value === void 0) {
+    } else if (typeof value === "function") {
+      addPlugin(value, ...options);
+    } else if (typeof value === "object") {
+      if (Array.isArray(value)) {
+        addList(value);
+      } else {
+        addPreset(value);
+      }
+    } else {
+      throw new TypeError("Expected usable value, not `" + value + "`");
+    }
+    if (settings) {
+      namespace.settings = Object.assign(namespace.settings || {}, settings);
+    }
+    return processor;
+    function add(value2) {
+      if (typeof value2 === "function") {
+        addPlugin(value2);
+      } else if (typeof value2 === "object") {
+        if (Array.isArray(value2)) {
+          const [plugin, ...options2] = value2;
+          addPlugin(plugin, ...options2);
+        } else {
+          addPreset(value2);
+        }
+      } else {
+        throw new TypeError("Expected usable value, not `" + value2 + "`");
+      }
+    }
+    function addPreset(result) {
+      addList(result.plugins);
+      if (result.settings) {
+        settings = Object.assign(settings || {}, result.settings);
+      }
+    }
+    function addList(plugins) {
+      let index2 = -1;
+      if (plugins === null || plugins === void 0) {
+      } else if (Array.isArray(plugins)) {
+        while (++index2 < plugins.length) {
+          const thing = plugins[index2];
+          add(thing);
+        }
+      } else {
+        throw new TypeError("Expected a list of plugins, not `" + plugins + "`");
+      }
+    }
+    function addPlugin(plugin, value2) {
+      let index2 = -1;
+      let entry;
+      while (++index2 < attachers.length) {
+        if (attachers[index2][0] === plugin) {
+          entry = attachers[index2];
+          break;
+        }
+      }
+      if (entry) {
+        if (isPlainObject(entry[1]) && isPlainObject(value2)) {
+          value2 = (0, import_extend.default)(true, entry[1], value2);
+        }
+        entry[1] = value2;
+      } else {
+        attachers.push([...arguments]);
+      }
+    }
+  }
+  function parse(doc) {
+    processor.freeze();
+    const file = vfile(doc);
+    const Parser = processor.Parser;
+    assertParser("parse", Parser);
+    if (newable(Parser, "parse")) {
+      return new Parser(String(file), file).parse();
+    }
+    return Parser(String(file), file);
+  }
+  function stringify(node, doc) {
+    processor.freeze();
+    const file = vfile(doc);
+    const Compiler = processor.Compiler;
+    assertCompiler("stringify", Compiler);
+    assertNode(node);
+    if (newable(Compiler, "compile")) {
+      return new Compiler(node, file).compile();
+    }
+    return Compiler(node, file);
+  }
+  function run(node, doc, callback) {
+    assertNode(node);
+    processor.freeze();
+    if (!callback && typeof doc === "function") {
+      callback = doc;
+      doc = void 0;
+    }
+    if (!callback) {
+      return new Promise(executor);
+    }
+    executor(null, callback);
+    function executor(resolve, reject) {
+      transformers.run(node, vfile(doc), done);
+      function done(error, tree, file) {
+        tree = tree || node;
+        if (error) {
+          reject(error);
+        } else if (resolve) {
+          resolve(tree);
+        } else {
+          callback(null, tree, file);
+        }
+      }
+    }
+  }
+  function runSync(node, file) {
+    let result;
+    let complete;
+    processor.run(node, file, done);
+    assertDone("runSync", "run", complete);
+    return result;
+    function done(error, tree) {
+      bail(error);
+      result = tree;
+      complete = true;
+    }
+  }
+  function process(doc, callback) {
+    processor.freeze();
+    assertParser("process", processor.Parser);
+    assertCompiler("process", processor.Compiler);
+    if (!callback) {
+      return new Promise(executor);
+    }
+    executor(null, callback);
+    function executor(resolve, reject) {
+      const file = vfile(doc);
+      processor.run(processor.parse(file), file, (error, tree, file2) => {
+        if (error || !tree || !file2) {
+          done(error);
+        } else {
+          const result = processor.stringify(tree, file2);
+          if (result === void 0 || result === null) {
+          } else if (looksLikeAVFileValue(result)) {
+            file2.value = result;
+          } else {
+            file2.result = result;
+          }
+          done(error, file2);
+        }
+      });
+      function done(error, file2) {
+        if (error || !file2) {
+          reject(error);
+        } else if (resolve) {
+          resolve(file2);
+        } else {
+          callback(null, file2);
+        }
+      }
+    }
+  }
+  function processSync(doc) {
+    let complete;
+    processor.freeze();
+    assertParser("processSync", processor.Parser);
+    assertCompiler("processSync", processor.Compiler);
+    const file = vfile(doc);
+    processor.process(file, done);
+    assertDone("processSync", "process", complete);
+    return file;
+    function done(error) {
+      complete = true;
+      bail(error);
+    }
+  }
+}
+function newable(value, name) {
+  return typeof value === "function" && value.prototype && (keys(value.prototype) || name in value.prototype);
+}
+function keys(value) {
+  let key;
+  for (key in value) {
+    if (own.call(value, key)) {
+      return true;
+    }
+  }
+  return false;
+}
+function assertParser(name, value) {
+  if (typeof value !== "function") {
+    throw new TypeError("Cannot `" + name + "` without `Parser`");
+  }
+}
+function assertCompiler(name, value) {
+  if (typeof value !== "function") {
+    throw new TypeError("Cannot `" + name + "` without `Compiler`");
+  }
+}
+function assertUnfrozen(name, frozen) {
+  if (frozen) {
+    throw new Error(
+      "Cannot call `" + name + "` on a frozen processor.\nCreate a new processor first, by calling it: use `processor()` instead of `processor`."
+    );
+  }
+}
+function assertNode(node) {
+  if (!isPlainObject(node) || typeof node.type !== "string") {
+    throw new TypeError("Expected node, got `" + node + "`");
+  }
+}
+function assertDone(name, asyncName, complete) {
+  if (!complete) {
+    throw new Error(
+      "`" + name + "` finished async. Use `" + asyncName + "` instead"
+    );
+  }
+}
+function vfile(value) {
+  return looksLikeAVFile(value) ? value : new VFile(value);
+}
+function looksLikeAVFile(value) {
+  return Boolean(
+    value && typeof value === "object" && "message" in value && "messages" in value
+  );
+}
+function looksLikeAVFileValue(value) {
+  return typeof value === "string" || (0, import_is_buffer2.default)(value);
+}
+// Annotate the CommonJS export names for ESM import in node:
+0 && (module.exports = {
+  unified: unified1012
+});
+/*!
+ * Determine if an object is a Buffer
+ *
+ * @author   Feross Aboukhadijeh <https://feross.org>
+ * @license  MIT
+ */