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export default {
    ssr: true,
    presets: [vercelPreset()],
    future: {
        unstable_middleware: true
    }
}

throw this error on each run :

Error: Unable to create initial unstable_RouterContextProvider instance. Please confirm you are returning an instance of Map<unstable_routerContext, unknown> from your getLoadContext function.

Error: TypeError: init is not iterable
at Object.requestHandler [as handlerWeb] (/var/task/node_modules/react-router/dist/development/index.js:10954:23)
at Object.handler (/opt/rust/nodejs.js:2:14544)
at Server. (/opt/rust/nodejs.js:2:1716)
at /opt/rust/nodejs.js:16:6302
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at /opt/rust/nodejs.js:16:6290
at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)
at Server. (/opt/rust/nodejs.js:16:6278)
at Server.s (/opt/rust/nodejs.js:16:1040)
at Server.emit (node:events:518:28)