How to check if a string is a number in TypeScript?

Hi everyone! I just started learning TypeScript and ran into this problem. I have a function that takes a string, and I need to determine if this string contains only digits (i.e., whether it is a numeric representation). I tried using typeof, but it always returns 'string' for strings. I also tried using Number() or parseInt(), but they behave strangely: for example, Number("123abc") returns NaN, while parseInt("123abc") returns 123. That's not exactly what I need. Here's an example of the code I'm trying to write: ```typescript function isNumericString(value: string): boolean { // How to check correctly? return typeof value === 'number'; // Doesn't work, value is always a string } // Examples: console.log(isNumericString("123")); // Should be