Codemod to help adoption of types stripping

[AugustinMauroy]

Description/Context

To enable TypeScript support on Node.js, Marco came up with the idea of types stripping. This approach is now supported by the TypeScript transpiler and is on its way to becoming stable on Node.js. That is why we must try to create one or more codemods that will enable adoption of this approach.

Todo

• Use right file extension on import specifier @nodejs/correct-ts-specifiers (need to be updated to new codemod paradigm)

Thing to define

• How to go away from enum
• What do we have to change in the tsconfig.json

[Renegade334]

For context, a list of what TS currently considers non-strippable:

• Pointy type assertions: <T>x (as opposed to x as T which is strippable)
• Class properties from constructor parameters: constructor(public x) { ... }
• enums
• namespaces containing any runtime exports (type-only namespaces are strippable)
• import x = ... and export = ...

[AugustinMauroy]

import { type } from "package"; also if a type is imported without the type keyword it's not working

[JakobJingleheimer]

import { type } from "package"; also if a type is imported without the type keyword it's not working

correct-ts-specifiers handles some of that (if it's a .d.ts file). tslint handles the other cases.