Recursively read a directory with callbacks for each file and directory.

recursiveRead.ts

import { readdirSync, readFileSync, statSync } from "node:fs";
import { join } from "node:path";

export function recursiveRead({
  entryPath,
  onDirectory,
  onDirectoryExit,
  onFile,
  onError,
}: {
  entryPath: string;
  onDirectory?: (path: string) => void;
  onDirectoryExit?: (path: string) => void;
  onFile?: (content: string, path: string) => void;
  onError?: (error: unknown) => void;
}) {
  try {
    const stat = statSync(entryPath);
    if (stat.isFile()) {
      const fileContent = readFileSync(entryPath, "utf8");
      onFile?.(fileContent, entryPath);
    } else if (stat.isDirectory()) {
      onDirectory?.(entryPath);
      const childNames = readdirSync(entryPath);
      for (const childName of childNames) {
        const childPath = join(entryPath, childName);
        recursiveRead({
          entryPath: childPath,
          onDirectory,
          onDirectoryExit,
          onFile,
          onError,
        });
      }
      onDirectoryExit?.(entryPath);
    }
  } catch (err) {
    onError?.(err);
  }
}