Type Alias DeepReadonly<T>

DeepReadonly: T extends Function
    ? T
    : T extends ReadonlyArray<infer U>
        ? ReadonlyArray<DeepReadonly<U>>
        : T extends object ? { readonly [P in keyof T]: DeepReadonly<T[P]> } : T

Represents a recursive readonly type where all nested properties are readonly.

Type Parameters

T
The type to transform.

Since

0.14.0

Example

interface Config {
    server: {
        host: string;
        port: number;
    };
}

const cfg: DeepReadonly<Config> = { server: { host: "localhost", port: 8080 } };

// cfg.server.host = "example.com";  // Error: cannot assign to a read-only property

Type Alias DeepReadonly<T>

Type Parameters

Since

Example

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