feat(auth): trust dev frontend origins (Expo web :8081) for CORS + Better-Auth#160
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A frontend dev server on a port outside the dev CORS allowlist could not
sign up / sign in cross-origin: CORS preflight blocked it, and even past
CORS, Better-Auth's own origin guard (trustedOrigins — separate from CORS)
rejected it with "Invalid origin".
- corsDefaults("development"): add http://localhost:8081 + :19006 (the
Expo web / Metro dev server ports) alongside the existing Nuxt/Vite ones.
- buildBetterAuth: new optional `trustedOrigins`; BetterAuthModule feeds it
corsDefaults(env).allowedOrigins so CORS and Better-Auth's trusted-origin
set share a single source of truth. baseURL stays implicitly trusted.
Verified: POST /api/auth/sign-up/email with Origin http://localhost:8081
returns 200 (previously "Invalid origin").
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Problem
A frontend dev server running on a port outside the dev CORS allowlist (e.g. Expo Web / Metro on
:8081) cannot sign up or sign in cross-origin against the dev API. It fails twice over:corsDefaults("development")) only had:3000,:3001,:5173,app.nst.localhost→ preflight blocked.trustedOrigins, separate from CORS) rejected the request with"Invalid origin".Fix
corsDefaults("development"): addhttp://localhost:8081+http://localhost:19006(Expo web / Metro dev ports).buildBetterAuth: new optionaltrustedOrigins;BetterAuthModulefeeds itcorsDefaults(env).allowedOrigins, so CORS and Better-Auth's trusted-origin set share one source of truth. ThebaseURLstays implicitly trusted.Verification
POST /api/auth/sign-up/emailwithOrigin: http://localhost:8081now returns200(previously"Invalid origin"). Extendstests/cookies-cors-config.spec.tswith a:8081assertion. Local gates green: lint (0 errors), cors spec (12/12), test:types.