How do I fix the build error that says "Operator '+' cannot be used with types 'number[]'?

The function below is designed to generate unique uuidv4 strings.

function uuidv4() {
  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
    (
      c ^
      (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
    ).toString(16)
  );
}
console.log(uuidv4());

When attempting to build this code with TypeScript, an error appears:

TS2365: Operator '+' cannot be applied to types 'number[]' and '-1000'.

How can this function be adjusted to successfully build with TypeScript?

javascripttypescript

Answer №1

One method for minifying code involves evaluating the entire expression, such as 

([1e7] + -1e3 + -4e3 + -8e3 + -1e11)
, which results in the string:

10000000-1000-4000-8000-100000000000

Instead of relying on coercion and potentially upsetting Typescript, you can simply use this string directly:

function uuidv4() {
    return ("10000000-1000-4000-8000-100000000000").replace(/[018]/g, c =>
        (
        c ^
        (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))
        ).toString(16)
    );
}
console.log(uuidv4());

If desired, you can also replace all instances of non-fours with zeros since they are now redundant.

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