Preserve stack trace in err()

Author: paulmillr

index.d.ts

@@ -197,4 +197,4 @@ declare const utils: {
     randomPrivateKey: () => Bytes;
     precompute: (w?: number, p?: Point) => Point;
 };
-export { secp256k1_CURVE as CURVE, etc, getPublicKey, getSharedSecret, Point, Point as ProjectivePoint, sign, signAsync, Signature, utils, verify };
+export { secp256k1_CURVE as CURVE, etc, getPublicKey, getSharedSecret, Point, Point as ProjectivePoint, sign, signAsync, Signature, utils, verify, };

index.js

@@ -28,9 +28,15 @@ const L2 = 64;
 // Helpers and Precomputes sections are reused between libraries
 // ## Helpers
 // ----------
-// error helper, messes-up stack trace
-const err = (m = '') => {
-    throw new Error(m);
+const captureTrace = (...args) => {
+    if ('captureStackTrace' in Error && typeof Error.captureStackTrace === 'function') {
+        Error.captureStackTrace(...args);
+    }
+};
+const err = (message = '') => {
+    const e = new Error(message);
+    captureTrace(e, err);
+    throw e;
 };
 const isBig = (n) => typeof n === 'bigint'; // is big integer
 const isStr = (s) => typeof s === 'string'; // is string
@@ -794,4 +800,4 @@ const wNAF = (n) => {
     return { p, f }; // return both real and fake points for JIT
 };
 // !! Remove the export below to easily use in REPL / browser console
-export { secp256k1_CURVE as CURVE, etc, getPublicKey, getSharedSecret, Point, Point as ProjectivePoint, sign, signAsync, Signature, utils, verify };
+export { secp256k1_CURVE as CURVE, etc, getPublicKey, getSharedSecret, Point, Point as ProjectivePoint, sign, signAsync, Signature, utils, verify, };

index.ts

@@ -52,9 +52,15 @@ export type WeierstrassOpts<T> = Readonly<{
 
 // ## Helpers
 // ----------
-// error helper, messes-up stack trace
-const err = (m = ''): never => {
-  throw new Error(m);
+const captureTrace = (...args: Parameters<typeof Error.captureStackTrace>): void => {
+  if ('captureStackTrace' in Error && typeof Error.captureStackTrace === 'function') {
+    Error.captureStackTrace(...args);
+  }
+};
+const err = (message = ''): never => {
+  const e = new Error(message);
+  captureTrace(e, err);
+  throw e;
 };
 const isBig = (n: unknown): n is bigint => typeof n === 'bigint'; // is big integer
 const isStr = (s: unknown): s is string => typeof s === 'string'; // is string