Stone.js API
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    ServerLoaderPolicy: "server-first" | "server-only" | "client-only"

    How a loader behaves across the SSR/CSR boundary.

    • server-first : run on the server; on failure, defer to a client fetch (or fallback).
    • server-only : run only on the server; on failure, use the fallback or give up (never client).
    • client-only : never run on the server (needs the browser); always fetched on the client.