function divide(a: number, b: number): Result<number, string> {
  if (b === 0) return Err("division by zero");
  return Ok(a / b);
}

const result = divide(10, 0);
if (result.ok)
  console.log(result.value); // typed as number
else console.log(result.error); // typed as string

import { Ok, Err, Result } from "ts-result-type";

function divide(a: number, b: number): Result<number, string> {
  if (b === 0) return Err("division by zero");
  return Ok(a / b);
}

const result = divide(10, 2);

if (result.ok) {
  console.log(result.value); // 5 — fully typed as number
} else {
  console.log(result.error); // fully typed as string
}

const message = Result.match(divide(10, 0), {
  ok: (value) => `Result: ${value}`,
  err: (error) => `Failed: ${error}`,
});
// "Failed: division by zero"

const result = Result.flatMap(Ok("42"), (s) => {
  const n = parseInt(s, 10);
  return isNaN(n) ? Err("not a number") : Ok(n);
});
// Ok(42)

import { fromThrowable, fromPromise } from "ts-result-type";

const parsed = fromThrowable(() => JSON.parse(input));

const data = await fromPromise(
  fetch("/api/data").then((r) => r.json()),
  (e) => `Fetch failed: ${(e as Error).message}`,
);