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RemoteHelperContextError

Trace a SvelteKit request-context failure normalized at an SER remote helper boundary.

What this error means and what can trigger it

RemoteHelperContextError means a native SvelteKit remote helper or request lookup reported that it was running outside its route/request context. This commonly follows a declaration outside a valid *.remote.ts route module or execution in tooling that does not establish SvelteKit's request store.

SER has to recognize this condition by its message because SvelteKit does not expose a stable error class for an instanceof check. The accepted messages begin with Can only read the current request event inside functions invoked during handle or exactly match Could not get the request store. Consequently, a user-thrown Error carrying the same text is classified in the same way.

Exactly where it triggers

modules/svelte-effect-runtime/src/remote/server.ts L290 @ C10 
export function normalize_remote_helper_error(err: unknown, helper_name: string): Error {
	if (is_sveltekit_remote_context_error(err)) {
		return new RemoteHelperContextError(helper_name);
	}

	return err instanceof Error ? err : new RemoteHelperError(err);
}

Factory-level catches call this normalization at:

Wrapper-level catches also normalize request capture and synchronous handler invocation:

For reference, the class itself is declared at modules/svelte-effect-runtime/src/errors.ts L816 @ C14.

Why this is the case

SER wraps several SvelteKit helper shapes and needs one stable error class for missing route context across those boundaries. Message recognition is the available compatibility seam when the upstream failure has no public nominal type.

The synchronous catches cover factory setup, request capture, and a handler that throws before returning. A Promise that rejects later has already crossed that catch boundary and travels through the remote effect failure machinery instead.