@juststarting00/minimal-ts-app/src/PrimeChecker.ts

A minimal TypeScript library that uses NPM. See README for further info

export class PrimeChecker {
    public isPrime(num : number) : boolean {
        var isPrime = num % 2 !== 0;
    
        for (let index = 3; isPrime && index <= Math.sqrt(num); index += 2) {
            isPrime = num % index !== 0;
        }
    
        return isPrime
    }
}