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Readonly type breaks Set and Map
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**TypeScript Version:** 3.4.0-dev.201xxxxx
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**Code**
```ts
// 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.
```ts
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:**
```ts
type Readonly<T> = {
readonly [P in keyof T]: T[P];
};
```
**Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior -->
**Related Issues:** <!-- Did you find other bugs that looked similar? -->
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