/**
 * OAuth token-endpoint body parsing (RFC 6749 §3.2).
 *
 * Kept in its own side-effect-free module so it can be unit-tested directly —
 * api/oauth.ts creates a Supabase client at import time, which throws without
 * env, so it cannot be imported from a test.
 */
/** Token-endpoint params (RFC 6749 §3.2). See {@link bodyToSource}. */
export declare function parseTokenRequestParams(contentType: string, body: unknown): Record<string, string | undefined>;
/**
 * Authorize-endpoint consent-POST params (RFC 6749 §4.1.1). The consent form
 * submits application/x-www-form-urlencoded, which Vercel delivers as an
 * object — so this MUST go through {@link bodyToSource} or every field (incl.
 * client_id) is dropped and the user sees "Missing client_id".
 */
export declare function parseAuthorizeRequestParams(contentType: string, body: unknown): Record<string, string | undefined>;