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1/**
2 * Returns true if the error is a programming bug (TypeError, ReferenceError,
3 * SyntaxError). Callers should re-throw these so they propagate to the global
4 * error handler rather than being silently swallowed.
5 */
6export function isProgrammingError(error: unknown): boolean {
7 return (
8 error instanceof TypeError ||
9 error instanceof ReferenceError ||
10 error instanceof SyntaxError
11 );
12}
13
14/**
15 * Returns true if the error is an AppView network error (AppView unreachable).
16 * Callers should return 503 so the user knows to retry.
17 *
18 * fetchApi() throws with this prefix for connection-level failures:
19 * "AppView network error: ..."
20 */
21export function isNetworkError(error: unknown): boolean {
22 return (
23 error instanceof Error &&
24 error.message.startsWith("AppView network error:")
25 );
26}
27
28/**
29 * Returns true if the error is an AppView 404 Not Found response.
30 * Callers should return a 404 HTML page to the user.
31 *
32 * fetchApi() throws with this prefix for non-ok HTTP responses:
33 * "AppView API error: 404 Not Found"
34 */
35export function isNotFoundError(error: unknown): boolean {
36 return (
37 error instanceof Error &&
38 error.message.startsWith("AppView API error: 404")
39 );
40}