fixed nested mdx and files named index

packages/mdx/index.ts

@@ -1 +1,2 @@
 export * from "./listMdxFiles";
+export * from "./mdx";

packages/mdx/mdx.ts

@@ -0,0 +1,63 @@
+import { promises as fsPromises } from "fs";
+import path from "path";
+
+type MdxPath = {
+  params: {
+    fileName: Array<String>
+  }
+}
+
+export async function getMdxPaths(docsDir) {
+   // relative to the project root
+  const fullPath = path.resolve(docsDir);
+  let paths: MdxPath[] = [];
+  for await (const f of getFiles(fullPath)) {
+  //process paths
+    const fParsed = path.parse(f);
+    if(fParsed.ext.match(/.mdx?$/)) {
+      const relativePath = f.replace(fullPath, "");
+      let pathArgs: Array<String> = relativePath.split(path.sep);
+      pathArgs.shift();
+      if(fParsed.name === "index") {
+        pathArgs.pop();
+      } else {
+        pathArgs[pathArgs.length - 1] = fParsed.name; 
+      }
+      paths.push({params: {fileName: pathArgs}})
+    }
+  }
+  return paths;
+}
+
+export async function* getFiles(dir) {
+  const dirents = await fsPromises.readdir(dir, { withFileTypes: true });
+  for (const dirent of dirents) {
+    const res = path.resolve(dir, dirent.name);
+    if (dirent.isDirectory()) {
+      yield* getFiles(res);
+    } else {
+      //do something to get the path link
+      yield res
+    }
+  }
+}
+
+
+
+export function getFirstHeader(mdText) {
+  return mdText.match(/^<.+?>(.+?)<.+?>/)?.[1];
+}
+
+export async function getSource(docFolder, fileNames) {
+  const fullPath = path.resolve(docFolder, ...fileNames)
+  let isFolder;
+  try {
+    await fsPromises.access(fullPath);
+    isFolder = true;
+  } catch {
+    isFolder = false;
+  }
+  const filePath = (isFolder)?path.resolve(fullPath, "index.md"): fullPath + ".md";
+  const source = await fsPromises.readFile(filePath, { encoding: "utf8" });
+  return { filePath, source }
+}