chore: cleanup files and split into modules

src/sha.ts

@@ -0,0 +1,13 @@
+import * as fs from 'fs-extra';
+import * as crypto from 'crypto';
+
+export const sha = async (filePath: string) => {
+  const hash = crypto.createHash('sha256');
+  const fileStream = fs.createReadStream(filePath);
+  fileStream.pipe(hash);
+  await new Promise((resolve, reject) => {
+    fileStream.on('end', () => resolve());
+    fileStream.on('error', (err) => reject(err));
+  });
+  return hash.digest('hex');
+};