index.ts

#! /usr/bin/env node

import inquirer from 'inquirer';

let conversion={
    "PKR":{
        "USD":0.0036,
        "GBP":0.0030,
        "PKR":1,
        "KWD":0.0011
    },
    "GBP":{
        "USD":1.22,
        "GBP":1,
        "PKR":334.15,
        "KWD":0.38
    },
    "USD":{
        "USD":1,
        "GBP":0.82,
        "PKR":275,
        "KWD":0.31
    },
    "KWD":{
        "USD":3.24,
        "GBP":2.67,
        "PKR":900.90,
        "KWD":1
    }

}

const answer:{
    from:"PKR"|"USD"|"GBP"|"KWD",
    to:"PKR"|"USD"|"GBP"|"KWD",
    amount:number
}=await inquirer.prompt([
    {
        type:"list",
        name:"from",
        choices:["PKR","USD","GBP","KWD"],
        message:"select your first currency from"
    },
    {
        type:"list",
        name:"to",
        choices:["PKR","USD","GBP","KWD"],
        message:"select your second currrency to"
    },
    {
        type:"number",
        name:"amount",
        message:"Enter your conversion amount: "
    }
]);

const {from,to,amount}=answer;

if(from && to && amount){
    let result = conversion[from][to]*amount;
console.log(`your conversion from ${from} to ${to} = ${result}`);
}else{
    console.log("Invalid input");
}