chore(core): fix error.cause in BetterAuthError (#7347)

packages/better-auth/src/plugins/jwt/index.ts

@@ -43,16 +43,14 @@ export const jwt = <O extends JwtOptions>(options?: O) => {
 	// Remote url must be set when using signing function
 	if (options?.jwt?.sign && !options.jwks?.remoteUrl) {
 		throw new BetterAuthError(
-			"jwks_config",
-			"jwks.remoteUrl must be set when using jwt.sign",
+			"options.jwks.remoteUrl must be set when using options.jwt.sign",
 		);
 	}
 
 	// Alg is required to be specified when using remote url (needed in openid metadata)
 	if (options?.jwks?.remoteUrl && !options.jwks?.keyPairConfig?.alg) {
 		throw new BetterAuthError(
-			"jwks_config",
-			"must specify alg when using the oidc plugin and jwks.remoteUrl",
+			"options.jwks.keyPairConfig.alg must be specified when using the oidc plugin with options.jwks.remoteUrl",
 		);
 	}
 
@@ -64,8 +62,7 @@ export const jwt = <O extends JwtOptions>(options?: O) => {
 		jwksPath.includes("..")
 	) {
 		throw new BetterAuthError(
-			"jwks_config",
-			"jwksPath must be a non-empty string starting with '/' and not contain '..'",
+			"options.jwks.jwksPath must be a non-empty string starting with '/' and not contain '..'",
 		);
 	}
 

packages/better-auth/src/plugins/jwt/jwt.test.ts

@@ -419,7 +419,9 @@ describe("jwt - remote signing", async () => {
 					}),
 				],
 			}),
-		).toThrowError("jwks_config");
+		).toThrowError(
+			"options.jwks.remoteUrl must be set when using options.jwt.sign",
+		);
 	});
 });
 
@@ -435,7 +437,9 @@ describe("jwt - remote url", async () => {
 					}),
 				],
 			}),
-		).toThrowError("jwks_config");
+		).toThrowError(
+			"options.jwks.keyPairConfig.alg must be specified when using the oidc plugin with options.jwks.remoteUrl",
+		);
 	});
 
 	it("should accept remoteUrl with alg specified", async () => {

packages/better-auth/src/utils/url.ts

@@ -27,7 +27,9 @@ function assertHasProtocol(url: string): void {
 		}
 		throw new BetterAuthError(
 			`Invalid base URL: ${url}. Please provide a valid base URL.`,
-			String(error),
+			{
+				cause: error,
+			},
 		);
 	}
 }

packages/core/src/error/index.ts

@@ -1,11 +1,10 @@
 import { APIError as BaseAPIError } from "better-call/error";
 
 export class BetterAuthError extends Error {
-	constructor(message: string, cause?: string | undefined) {
-		super(message);
+	constructor(message: string, options?: { cause?: unknown | undefined }) {
+		super(message, options);
 		this.name = "BetterAuthError";
 		this.message = message;
-		this.cause = cause;
 		this.stack = "";
 	}
 }