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DeepPartial<T>

DeepPartial<T> = T extends object ? { [P in keyof T]?: DeepPartial<T[P]> } : T

Makes all properties of T optional recursively, at every depth level.

Unlike TypeScript's built-in Partial<T> which only affects the first level, DeepPartial<T> makes nested object properties optional as well.

Type Parameters​

T: T​

The type to make deeply partial

Since​

2.0.0

Example​

type Config = {
  server: {
    host: string;
    port: number;
  };
  debug: boolean;
};

// Partial`<Config>` = { server?: { host: string; port: number }; debug?: boolean }
// ⚠️ server.host and server.port are still required!

// DeepPartial`<Config>` = { server?: { host?: string; port?: number }; debug?: boolean }
// ✅ Everything is optional at all levels

function updateConfig(patch: `DeepPartial<Config>`) {
  // Can pass just { server: { port: 8080 } }
}