Readonly type breaks Set and Map

TypeScript Version: 3.4.0-dev.201xxxxx

Search Terms:

Code

// A *self-contained* demonstration of the problem follows...
// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.

Expected behavior:

However, Set and Map can't use with es3 and es5. We need any workaround.

export type Readonly<T> =
  T extends ReadonlySet<infer V> ? ReadonlySet<V> :
  T extends ReadonlyMap<infer K, infer V> ? ReadonlyMap<K, V> :
  { readonly [P in keyof T]: T[P]; };

Actual behavior:

type Readonly<T> = {
    readonly [P in keyof T]: T[P];
};

Playground Link:

Related Issues:

No repository file or test is named. Start by reducing the supplied Readonly snippets to a reproducible TypeScript example and run it with tsc; done means the intended Set and Map behavior for ES3/ES5 is clearly reproduced and covered by an appropriate compiler test.