Type Alias DeepPartial<T>

DeepPartial: T extends Primitive
    ? T
    : T extends AnyFn
        ? T
        : T extends MutableMap<infer K, infer V>
            ? MutableMap<DeepPartial<K>, DeepPartial<V>>
            : T extends ReadonlyMap<infer K, infer V>
                ? ReadonlyMap<DeepPartial<K>, DeepPartial<V>>
                : T extends MutableSet<infer V>
                    ? MutableSet<DeepPartial<V>>
                    : T extends ReadonlySet<infer V>
                        ? ReadonlySet<DeepPartial<V>>
                        : T extends Record<string, any>
                        | readonly unknown[]
                            ? { [K in keyof T]?: DeepPartial<T[K]> }
                            : T

Recursively applies the ? optional modifier to all properties of an UnknownRecord or array. Handles Map and Set types by applying DeepPartial to their keys/values. Primitives and functions are returned as is. Note: passing any yields a union of both conditional branches (standard TypeScript behavior for any in conditional types).

Type Parameters

T
The type to make deeply partial.

Returns

A new type with all nested properties marked as optional.

Example

type Data = { a: number; b: { c: string[]; d: Map<number, boolean> } };
type PartialData = DeepPartial<Data>;
// Result: {
//   a?: number | undefined;
//   b?: {
//     c?: (string | undefined)[] | undefined;
//     d?: ReadonlyMap<number | undefined, boolean | undefined> | undefined;
//   } | undefined;
// }

Type Alias DeepPartial<T>

Type Parameters

Returns

Example

Settings