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feat: Enhance type safety for MongoDB filter conditions by introducing helper types for $in and $nin values

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This commit is contained in:
Jürgen Kunz
2025-08-18 11:42:41 +00:00
parent cdd1ae2c9b
commit bf66209d3e
1 changed files with 11 additions and 5 deletions
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16
ts/classes.doc.ts
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@@ -151,6 +151,12 @@ export function index(options?: IIndexOptions) {
};
}
// Helper type to extract element type from arrays or return T itself
type ElementOf<T> = T extends ReadonlyArray<infer U> ? U : T;
// Type for $in/$nin values - arrays of the element type
type InValues<T> = ReadonlyArray<ElementOf<T>>;
// Type that allows MongoDB operators on leaf values while maintaining nested type safety
export type MongoFilterCondition<T> = T | {
$eq?: T;
@@ -159,15 +165,15 @@ export type MongoFilterCondition<T> = T | {
$gte?: T;
$lt?: T;
$lte?: T;
$in?: T extends (infer U)[] ? U[] | U : T[];
$nin?: T extends (infer U)[] ? U[] | U : T[];
$in?: InValues<T>;
$nin?: InValues<T>;
$exists?: boolean;
$type?: string | number;
$regex?: string | RegExp;
$options?: string;
$all?: T extends (infer U)[] ? U[] : never;
$elemMatch?: T extends (infer U)[] ? MongoFilter<U> : never;
$size?: T extends any[] ? number : never;
$all?: T extends ReadonlyArray<infer U> ? ReadonlyArray<U> : never;
$elemMatch?: T extends ReadonlyArray<infer U> ? MongoFilter<U> : never;
$size?: T extends ReadonlyArray<any> ? number : never;
$not?: MongoFilterCondition<T>;
};