import * as fs from 'fs';
import * as readline from 'readline';

async function checkDuplicates(filePath: string) {
    const fileStream = fs.createReadStream(filePath);

    const rl = readline.createInterface({
        input: fileStream,
        crlfDelay: Infinity
    });

    const lines = new Set<string>();

    for await (const line of rl) {
        if (lines.has(line)) {
            console.log(`Duplicate line found: ${line}`);
            return;
        }
        lines.add(line);
    }

    console.log('No duplicate lines found.');
}

const filePath = process.argv[2];
if (!filePath) {
    console.log('Please provide a file path as the first argument.');
    process.exit(1);
}

checkDuplicates(filePath);