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DeepNullable<T> ​

ts
type DeepNullable<T> = T extends object ? DeepNullableObject<T> : T extends unknown[] ? DeepNullableArray<T> : T | null;

Defined in: types.ts:272

Recursively makes all properties throughout a type tree nullable by adding null to each property.

Type Parameters ​

Type ParameterDescription
TThe type to make deeply nullable

Example ​

ts
type Original = {
  name: string;
  address: {
    street: string;
    city: string;
  }
};

type Result = DeepNullable<Original>;
// Result: {
//   name: string | null;
//   address: {
//   street: string | null;
//   city: string | null;
//   } | null;
// }