The type '{ id: string; }' cannot be assigned to the type 'DeepPartial<T>'

In my code, I am attempting to create a generic function that abstracts my repository infrastructure for creating a where clause.

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

export interface SearchOneOptions<ENTITY extends { id: string }> {
  /** Names of object attributes nested in the result object that must be filled, if possible */
  includeNested?: string[];
  /** Entities that can be soft deleted won't appear in queries by default */
  withDeleted?: boolean;
  select?: string[];
  where?: DeepPartial<ENTITY>
}

const b = <T extends { id: string }>(t: T) => {
  const a: SearchOneOptions<T> = {
    where: {
      id: t.id
    }
  }
}

However, I encounter this error message:

Type '{ id: string; }' is not assignable to type 'DeepPartial<T>'.

Try it out on TypeScript Playground

Can anyone help me resolve this issue? Thank you so much :)

Answer №1

The use of the conditional type in the definition of DeepPartial may not be necessary as mapping over a primitive type will result in the original primitive value.

export type DeepPartial<T> = {
    [P in keyof T]?: DeepPartial<T[P]>;
};

Playground

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