AI solution for TypeScript puzzle on BFE.dev
2. implement Required<T>

Here is a possible solution to implement MyRequired<T>:

type MyRequired<T> = {  [P in keyof T]-?: T[P]}

In this solution, we use the -? modifier in the mapped type syntax to make all properties required.

By applying MyRequired<Foo> to the example above, we get:

const a: MyRequired<Foo> = {}// Error: Property 'a' is missing and required in type 'MyRequired<Foo>'const b: MyRequired<Foo> = {  a: 'BFE.dev'}// Error: Property 'b' is missing and required in type 'MyRequired<Foo>'const c: MyRequired<Foo> = {  b: 123}// Error: Property 'c' is missing and required in type 'MyRequired<Foo>'const d: MyRequired<Foo> = {  b: 123,  c: true}// Error: Property 'a' is missing and required in type 'MyRequired<Foo>'const e: MyRequired<Foo> = {  a: 'BFE.dev',  b: 123,  c: true}// valid

As expected, all properties of Foo are now required in MyRequired<Foo>.