fix(core): fix lint/type issues and small refactors

scripts/install-binary.js

@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+// deno-lint-ignore-file no-unused-vars
 
 /**
  * NUPST npm postinstall script
@@ -6,13 +7,14 @@
  */
 
 import { arch, platform } from 'os';
-import { chmodSync, existsSync, mkdirSync, unlinkSync, writeFileSync } from 'fs';
+import { chmodSync, existsSync, mkdirSync, unlinkSync } from 'fs';
 import { dirname, join } from 'path';
 import { fileURLToPath } from 'url';
 import https from 'https';
 import { pipeline } from 'stream';
 import { promisify } from 'util';
 import { createWriteStream } from 'fs';
+import process from "node:process";
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);