change extension from md to mdx using git

change-extension.js

const { resolve } = require('path');
const { readdir } = require('fs').promises;
const { exec } = require('child_process');

const DIRECTORY = 'docs';

async function* getFiles(dir) {
  const dirents = await readdir(dir, { withFileTypes: true });
  for (const dirent of dirents) {
    const res = resolve(dir, dirent.name);
    if (dirent.isDirectory()) {
      yield* getFiles(res);
    } else {
      yield res;
    }
  }
}

const rename = (oldPath, newPath) => exec(`git mv ${oldPath} ${newPath}`);

(async () => {
  for await (const originalFilePath of getFiles(DIRECTORY)) {
    const parts = originalFilePath.split('.');
    if (parts[parts.length - 1] !== 'md') continue;
    parts[parts.length - 1] = 'mdx';
    const newFilePath = parts.join('.');
    rename(originalFilePath, newFilePath);
  }
})();