`react-doctor/tanstack-start-server-fn-method-order`

Chain methods in order: .middleware() → .inputValidator() → .client() → .server() → .handler() — types depend on this sequence

Category: TanStack Start
Severity: error
Source: oxlint-plugin-react-doctor
Framework: tanstack-start
Enabled when: framework=tanstack-start and capabilities=tanstack-start

Validation prompt

Use this to decide whether a fired diagnostic is real or a false positive.

Fires (error severity) when the method chain rooted at createServerFn(...) has order-sensitive methods out of the sequence middleware → inputValidator → client → server → handler. Builder chains not rooted at createServerFn are ignored, and only that fixed set of methods is compared. The first inversion is reported.

Fix prompt

Use this once validation confirms the diagnostic is real.

Reorder the chain: createServerFn().middleware([...]).inputValidator(schema).server(fn).handler(fn). Each step's return type is the input to the next, so chaining .handler() before .inputValidator() strips the typed ctx.data; running .server() after .handler() detaches the server boundary. See https://tanstack.com/start/latest/docs/framework/react/server-functions