turbowatch/src/hashFile.ts

Extremely fast file change detector and task orchestrator for Node.js.

import { createHash } from 'node:crypto';
import { createReadStream } from 'node:fs';

export const hashFile = (filePath: string): Promise<string | null> => {
  return new Promise((resolve) => {
    const fileDescriptor = createReadStream(filePath);

    const hash = createHash('sha1').setEncoding('hex');

    fileDescriptor.on('error', () => {
      resolve(null);
    });

    fileDescriptor.on('end', () => {
      hash.end();

      resolve(hash.read());
    });

    fileDescriptor.pipe(hash);
  });
};