Typescript 扩展通用接口上不存在属性

Scenario:我正在try 创建一个基本方法，我可以对需要进行的几个不同调用重复使用(works/doesNotWork).基本方法应该进行一些设置，因为我不想重复几次.问题是，我传递给Setup调用的泛型告诉我它需要一个不同的类型.我需要的所有属性都存在于基本泛型类型上，但我遇到了打字问题.

Error:Argument of type '{ SyncCount: number; }' is not assignable to parameter of type 'DeepPartial<T>'.

Goal:我想要一个使用泛型的解决方案，它将允许我有一个基本方法，我可以调用设置.理想情况下，doesNotWork应该经过修改才能正常工作.AOS，请参见下面示例和小提琴中的所需代码(目标).

这是我issue美元中的一把小提琴

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

interface IDbRecord {
    readonly _id: string;
    readonly _rev: string;
    readonly DocumentType: string;
}

interface IBuilder<TEntity extends IDbRecord> {
    defaults(value: DeepPartial<TEntity>): Builder<TEntity>
}

class Builder<TEntity extends IDbRecord> implements IBuilder<TEntity> {

    defaults(value: DeepPartial<TEntity>): IBuilder<TEntity> {
        return this;
    }

}

interface IBaseEntity extends IDbRecord {
    SyncCount: number;
    SyncStatus: string
}

interface ICar extends IBaseEntity {
    Model: string;
}

interface IPerson extends IBaseEntity {
    Name: string
}

class Test {

    protected builder<TEntity extends IDbRecord>() {
        return new Builder<TEntity>();
    }

    private works<T extends IBaseEntity>() {
        // not using the generic type works
        return this.builder<IBaseEntity>().defaults({ SyncCount: 0 })
    }

    private doesNotWork<T extends IBaseEntity>() {
        // using the generic type does not work here
        return this.builder<T>().defaults({ SyncCount: 0 }) // ERROR
    }

    private someWorkingImplmentation<T extends IBaseEntity>() {
        return this.builder<T>().defaults({ SyncCount: 0 });
    }

    // I want to avoid duplicate code below from defaults.
    // A base setup method would be best
    people = this.builder<IPerson>().defaults({ SyncCount: 0 });
    cars = this.builder<ICar>().defaults({ SyncCount: 0 });

    // GOAL
    _people = this.someWorkingImplmentation<IPerson>();
    _cars = this.someWorkingImplmentation<ICar>();
}