Kysely•4w ago

Type safe discriminated union query

I am looking for a way to make this query more type safe. The generated SQL gives me the result I want, which adheres to the specified union type, but typescript needs some convincing and the $castTo assertions I have added are hurting type safety. If I remove .$castTo<unknown>() in the task query I get this error in the event query Property 'description' is missing in type '{ event_name: string; }' but required in type '{ description: string; }', and similar in the note query. If I remove the .$castTo to the discriminated union type in the end this type is inferred

const rows: {
    id: number;
    type: Type;
    details: unknown;
}[]

const rows: {
    id: number;
    type: Type;
    details: unknown;
}[]

I would be happy to hear any tips and tricks 🙇

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Type safe discriminated union query