npm-install-size/lib/minify.js

Check the install size of any NPM package before installing it.

import { readFile } from 'fs/promises';
import * as terser from 'terser';
import zlib from 'zlib';

export async function minifyAndGzipFile(filePath) {
  const code = await readFile(filePath, 'utf8');
  const minified = await terser.minify(code);
  if (!minified.code) throw new Error('Minification failed');
  const minifiedBuffer = Buffer.from(minified.code, 'utf8');
  const gzipped = zlib.gzipSync(minifiedBuffer);
  return {
    minifiedSize: minifiedBuffer.length,
    gzippedSize: gzipped.length
  };
}