refactor progress

packages/rate_limit/src/KVRequiredError.tsx

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+export interface KVRequiredErrorOptions {
+	serviceName: string;
+
+	configPath: string;
+
+	fluxerServerHint?: string;
+}
+
+export function throwKVRequiredError(options: KVRequiredErrorOptions): never {
+	const {serviceName, configPath, fluxerServerHint} = options;
+
+	const message =
+		`${serviceName} running in standalone mode requires KV-backed rate limiting. ` +
+		`${configPath} is not set. ` +
+		`Standalone services MUST have internal.kv configured for distributed rate limiting.`;
+
+	const hint = fluxerServerHint
+		? `If running in fluxer_server mode, ensure ${fluxerServerHint}.`
+		: `If running in fluxer_server mode, ensure setInjectedKVProvider() is called before service initialization.`;
+
+	throw new Error(`${message} ${hint}`);
+}