From: Chris Duncan <chris@codecow.com>
Date: Sun, 2 Aug 2026 21:27:04 +0000 (-0700)
Subject: Add hex typing.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=625d3b7a296021760ec518c10baded73779cb4aa;p=libnemo.git

Add hex typing.
---

diff --git a/src/index.ts b/src/index.ts
index bbc9941..5170ad1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,6 +12,9 @@ import { Wallet } from './lib/wallet'
 
 declare global {
 	type Bytes = Uint8Array<ArrayBuffer> | Buffer<ArrayBuffer>
+	type Hex = [HexByte]
+	type HexByte = `${HexChar}${HexChar}`
+	type HexChar = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | 'a' | 'b' | 'c' | 'd' | 'e' | 'f'
 }
 
 export {
diff --git a/src/lib/convert/hex.ts b/src/lib/convert/hex.ts
index f37d4de..f148e60 100644
--- a/src/lib/convert/hex.ts
+++ b/src/lib/convert/hex.ts
@@ -2,6 +2,16 @@
 //! SPDX-License-Identifier: GPL-3.0-or-later
 
 export const hex = Object.freeze({
+	/**
+	 * Check if input is a valid hexadecimal string.
+	 *
+	 * @param {unknown} input - Variable to check
+	 * @returns True if input is hex, else false
+	 */
+	is (input: unknown): input is Hex {
+		return typeof input === 'string' && /([0-9a-f]{2})+/.test(input)
+	},
+
 	/**
 	 * Convert a hexadecimal string to an ArrayBuffer. The result must be at least
 	 * one byte and no more than 4 GiB.