[feature request] destructured type assignment

Search Terms

typescript destructuring types

Suggestion

We can currently do:

type Lane = import('../Lane').Lane

But it would be nifty to be able to do:

type {Lane} = import('../Lane')

And taking it further, grab more things at once:

type {Lane, LaneColor, LaneSize} = import('../Lane')

instead of having to write

type Lane = import('../Lane').Lane
type LaneColor = import('../Lane').LaneColor
type LaneSize = import('../Lane').LaneSize

Use Cases

convenience

Examples

see above

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

Start by reviewing the existing import type syntax and the examples in this issue, then check the TypeScript design discussion for constraints around destructured type assignments. Done means supporting both single and multiple imported type names without changing JavaScript runtime output, with coverage for the shown forms.