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1/**
2 * Check if an error is a programming error (code bug).
3 * Programming errors should be re-thrown, not caught.
4 */
5export function isProgrammingError(error: unknown): boolean {
6 return (
7 error instanceof TypeError ||
8 error instanceof ReferenceError ||
9 error instanceof SyntaxError
10 );
11}
12
13/**
14 * Check if an error is a network error (temporary).
15 * Network errors should return 503 (retry later).
16 */
17export function isNetworkError(error: unknown): boolean {
18 if (!(error instanceof Error)) return false;
19 const msg = error.message.toLowerCase();
20 return (
21 msg.includes("fetch failed") ||
22 msg.includes("network") ||
23 msg.includes("econnrefused") ||
24 msg.includes("enotfound") ||
25 msg.includes("timeout") ||
26 msg.includes("etimedout") ||
27 msg.includes("econnreset") ||
28 msg.includes("enetunreach") ||
29 msg.includes("service unavailable")
30 );
31}
32
33/**
34 * Check if an error is an authentication error (wrong credentials).
35 * Auth errors should NOT be retried to avoid account lockouts.
36 */
37export function isAuthError(error: unknown): boolean {
38 if (!(error instanceof Error)) return false;
39 const message = error.message.toLowerCase();
40 return (
41 message.includes("invalid identifier") ||
42 message.includes("invalid password") ||
43 message.includes("authentication failed") ||
44 message.includes("unauthorized")
45 );
46}
47
48/**
49 * Check if an error represents a database-layer failure.
50 * These errors indicate temporary unavailability — user should retry.
51 */
52export function isDatabaseError(error: unknown): boolean {
53 if (!(error instanceof Error)) return false;
54 const msg = error.message.toLowerCase();
55 return (
56 msg.includes("pool") ||
57 msg.includes("postgres") ||
58 msg.includes("database") ||
59 msg.includes("sql") ||
60 // drizzle-orm wraps all failed queries as: "Failed query: <sql>\nparams: <params>"
61 msg.includes("failed query")
62 );
63}