Function requireNamed

requireNamed<K extends string, S extends string, C extends object, E>(
    key: K,
    source: S,
    onMissing: (ctx: C & Record<S, unknown>) => E,
): <I extends object & Record<S, unknown>, F, M extends RailwayMode>(
    workflow: Railway<I, F, M>,
) => Railway<I & Record<K, NonNullable<I[S]>>, E | F, M>
Reusable wrapper around Railway.require — narrows a nullable field.
Type Parameters
- K extends string
- S extends string
- C extends object
- E
Parameters
- key: K
- source: S
- onMissing: (ctx: C & Record<S, unknown>) => E
Returns <I extends object & Record<S, unknown>, F, M extends RailwayMode>(
workflow: Railway<I, F, M>,
) => Railway<I & Record<K, NonNullable<I[S]>>, E | F, M>
- Defined in packages/result/src/railway.ts:462