<pre class="shiki github-dark shaku"><code>type MyPartial&lt;T&gt; = { [k in keyof T]?: T[k]} // your code here, please don't use Partial&lt;T&gt;</code></pre>

This is my accepted solution

Partial<T> returns a type whichs represents all subsets of type T. Please implement MyPartial<T> by yourself. type Foo = { a: string b: number c: bool…