Type Alias DeepInject<T, D>

DeepInject: Simplify<
    T extends (infer U)[]
        ? DeepInject<U, D>[]
        : T extends ReadonlyArray<infer U>
            ? ReadonlyArray<DeepInject<U, D>>
            : T extends object
                ? {
                    [K in keyof T]: T[K] extends object ? DeepInject<T[K], D> : T[K]
                } & {
                    [K in Exclude<
                        { [K in keyof D]-?: {} extends Pick<(...), (...)> ? K : never }[keyof D],
                        keyof T,
                    >]?: D[K]
                } & {
                    [K in Exclude<
                        { [K in keyof D]-?: {} extends Pick<(...), (...)> ? never : K }[keyof D],
                        keyof T,
                    >]-?: D[K]
                }
                : T,
>

Deeply inject properties into an object tree.

Type Parameters

T
Target object type
D
Injected type

Remarks

Injects properties from type D into every nested object within T. Handles arrays and readonly arrays by injecting into their element types.

Properties in T are never overwritten by properties from D.

Example

type Nested = { level_1: { level_2: { } } };
type Metadata = { metadata?: string };
type DeepInjected = DeepInject< Nested, Metadata >;
// { level_1: { level_2: { metadata?: string }, metadata?: string }, metadata?: string }

Type Alias DeepInject<T, D>

Type Parameters

Remarks

Example

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