Check if number belongs to Fibonacci Sequence using Typescript

fibb.ts

function checkIfNumberIsFibonacci(n:number):boolean {
    let a:number = 0;
    let b:number = 1;
    for(let i:number=2; i<=n; i++) {
        const c:number = a+b;
        if(n===c || n===b || n===a) return true;
        a=b;
        b=c;
    }
    return false;
}

Hey Pruoo Care. This is the response for Q1B.
I know this could have been done in a much more efficient way but I hope this suffices since it's just a test.