Function isFileAnEmail

packages/ui/src/utils/get-emails-directory-metadata.ts:4–49

(fullPath: string)

import path from 'node:path';

const isFileAnEmail = async (fullPath: string): Promise<boolean> => {
  let fileHandle: fs.promises.FileHandle;
  try {
    fileHandle = await fs.promises.open(fullPath, 'r');
  } catch (exception) {
    console.warn(exception);
    return false;
  }
  const stat = await fileHandle.stat();

  if (stat.isDirectory()) {
    await fileHandle.close();
    return false;
  }

  const { ext } = path.parse(fullPath);

  if (ext === '.html') {
    await fileHandle.close();
    return true;
  }

  if (!['.js', '.tsx', '.jsx'].includes(ext)) {
    await fileHandle.close();
    return false;
  }

  // check with a heuristic to see if the file has at least
  // a default export (ES6) or module.exports (CommonJS) or named exports (MDX)
  const fileContents = await fileHandle.readFile('utf8');

  await fileHandle.close();

  // Check for ES6 export default syntax
  const hasES6DefaultExport = /\bexport\s+default\b/gm.test(fileContents);

  // Check for CommonJS module.exports syntax
  const hasCommonJSExport = /\bmodule\.exports\s*=/gm.test(fileContents);

  // Check for named exports (used in MDX files) and ensure at least one is marked as default
  const hasNamedExport = /\bexport\s+\{[^}]*\bdefault\b[^}]*\}/gm.test(
    fileContents,
  );

  return hasES6DefaultExport || hasCommonJSExport || hasNamedExport;
};

export interface EmailsDirectory {
  absolutePath: string;