Twoslashサポート

```ts twoslash
// @errors: 2540
interface Todo {
  title: string
}
 
const todo: Readonly<Todo> = {
  title: 'Delete inactive users'.toUpperCase()
  //  ^?
}
 
todo.title = 'Hello'
 
Number.parseInt('123', 10)
//      ^|
               // Just comments, so Popup will be
               // not behind the viewport of `<code>`
               // element due his `position: absolute` style
               //
```

interface Todo {
  title: string
}
 
const todo: Readonly<Todo> = {
  
title: stringtitle: 'Delete inactive users'.toUpperCase()
}
 
todo.title = 'Hello'
Cannot assign to 'title' because it is a read-only property.
 
Number.p
parseFloat
parseInt
prototypearseInt('123', 10)
 
 
 
 

const a = 1
Custom log message
const b = 1
Custom error message
const c = 1
Custom warning message
 
Custom annotation message