From ca9843a276fa97d095c8ebdc8fb6bc0509b6aa67 Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Thu, 13 Aug 2026 00:41:28 -0700
Subject: [PATCH] Print error strings from WASM data.

---
 src/lib/nano25519.ts | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/lib/nano25519.ts b/src/lib/nano25519.ts
index 8fd0115..63967a6 100644
--- a/src/lib/nano25519.ts
+++ b/src/lib/nano25519.ts
@@ -22,13 +22,24 @@ export const nano25519_init = (bytes: number[]): { derive: typeof derive, sign:
 	const { exports } = new WebAssembly.Instance(module, {
 		env: {
 			abort: (msg: any, file: any, row: any, col: any) => {
+				const getString = (pointer: number): string | null => {
+					const end = pointer + new Uint32Array(exports.memory.buffer)[pointer - 4 >>> 2] >>> 1
+					const buf = new Uint16Array(exports.memory.buffer)
+					let start = pointer >>> 1
+					let string = ''
+					while (end - start > 1024) {
+						string += String.fromCharCode(...buf.subarray(start, start += 1024))
+					}
+					return string + String.fromCharCode(...buf.subarray(start, end))
+				}
 				// ~lib/builtins/abort(~lib/string/String | null?, ~lib/string/String | null?, u32?, u32?) => void
-				msg = msg >>> 0
-				file = file >>> 0
-				row = row >>> 0
-				col = col >>> 0
-				console.error('wasm abort:', `msg ${msg}`, `file ${file}`, `row ${row}`, `col ${col}`)
-				throw new Error(msg, { cause: { file, row, col } })
+				msg >>>= 0
+				file >>>= 0
+				row >>>= 0
+				col >>>= 0
+				const message = 'nano25519/async wasm abort'
+				console.error(message, getString(msg), getString(file), { msg, file, row, col })
+				throw new Error(message)
 			},
 			"performance.now" () {
 				// ~lib/bindings/dom/performance.now() => f64
-- 
2.52.0