Issue with TypeScript Generics: The operand on the left side of the arithmetic operation must be of type 'any', 'number', or 'bigint'

I seem to be encountering an error that I can't quite decipher. Even though I've clearly set the type of first as a number, the code still doesn't seem to work properly. Can someone provide insights on how to fix this issue?

function divide<T, U>(first: T, second: U): number {
  return first / second;
}

const result = divide<number, number>(40, 2);

The TypeScript error message that's causing confusion is as follows:

5:12 The left-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
    3 | const TitleBar = () => {
    4 |   function divide<T, U>(first: T, second: U): number {
  > 5 |     return first / second;
      |            ^
    6 |   }
    7 |
    8 |   const result = divide<number, number>(40, 2);

Answer №1

Let's say T and U are placeholders for any type. The TypeScript compiler is not aware that the first and second parameters will be of a matching type for the divide operation. The function's return type does not match with the parameter types.

However, this code now compiles because TypeScript recognizes that T and U must be types that are within the number category.

function divide<T extends number, U extends number>(first: T, second: U): number {
  return first / second;
}

const result = divide<number, number>(40, 2);

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