import readline from "readline/promises";

const completions = '.set_a .set_b .help'.split(' ');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    completer: (line) => {
        const hits = completions.filter((c) => c.startsWith(line));
        // Show all completions if none found
        return [hits.length ? hits : completions, line];
    }
});

const answer = await rl.question('What is your query: > ');