Add support for "browser" condition (e.g., as used by Webpack) by stubbing-away Node imports (fixes #1441).

lib/markdownlint.mjs

@@ -1,10 +1,8 @@
 // @ts-check
 
-import * as nodeFs from "node:fs";
-import { createRequire } from "node:module";
-const dynamicRequire = createRequire(import.meta.url);
-import * as os from "node:os";
-import path from "node:path";
+// @ts-ignore
+import { fs as nodeFs, module, os, path } from "#node-imports";
+const dynamicRequire = module.createRequire(import.meta.url);
 import { initialize as cacheInitialize } from "./cache.mjs";
 import { version } from "./constants.mjs";
 import rules from "./rules.mjs";

lib/node-imports-browser-module.cjs

@@ -0,0 +1,7 @@
+// @ts-check
+
+"use strict";
+
+module.exports = {
+  "createRequire": () => require
+};

lib/node-imports-browser.mjs

@@ -0,0 +1,22 @@
+// @ts-check
+
+const getError = () => new Error("Node APIs are not available in browser context.");
+const throwForSync = () => {
+  throw getError();
+};
+
+export const fs = {
+  "access": (path, callback) => callback(getError()),
+  "accessSync": throwForSync,
+  "readFile": (path, options, callback) => callback(getError()),
+  "readFileSync": throwForSync
+};
+
+export { default as module } from "./node-imports-browser-module.cjs";
+
+export const os = {};
+
+export const path = {
+  "dirname": throwForSync,
+  "resolve": throwForSync
+};

lib/node-imports-node.mjs

@@ -0,0 +1,14 @@
+// @ts-check
+
+import { access, accessSync, readFile, readFileSync } from "node:fs";
+export const fs = { access, accessSync, readFile, readFileSync };
+
+import { createRequire } from "node:module";
+export const module = { createRequire };
+
+import { EOL, homedir } from "node:os";
+export const os = { EOL, homedir };
+
+// eslint-disable-next-line unicorn/import-style
+import { dirname, resolve } from "node:path";
+export const path = { dirname, resolve };