isSeed

Signature

isSeed(s: string): s is Seed

Purpose

Returns true if s is exactly 55 lowercase characters. TypeScript narrows s to Seed in the true branch. Never throws — use this when you want to check validity without committing to an exception path.

import { isSeed } from "@qubic.org/types"

function loadSeed(input: string): Seed {
  if (!isSeed(input)) {
    throw new Error(`Expected 55-char lowercase seed, got length ${input.length}`)
  }
  return input // input: Seed here
}

Parameters

Returns

s is Seed — a type predicate. true if s is exactly 55 lowercase characters, false otherwise.