Twoslash Support

Twoslash provides an inline type hove inside the code block.

Basic usage

You can enable twoslash to your code blocks by adding a twoslash metadata:

Markdown

```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
               //
```

Renders:

interface Todo {
  : string
}
 
const : <Todo> = {
  
title: stringtitle: 'Delete inactive users'.()
}
 
.title = 'Hello'Cannot assign to 'title' because it is a read-only property.
 
.pparseFloat
parseInt
prototype('123', 10)

Custom log message

You can add log message to your code by adding:

@log: <message> Custom log message
@error: <message> Custom error message
@warn: <message> Custom warn message
@annotate: <message> Custom annotate message

const  = 1Custom log message
const  = 1Custom error message
const  = 1Custom warning message
 Custom annotation message

Customize the Cascade Layers Docs Theme