Is it possible to use TS 1.x typings in TS 2.x imports?

Recently, I delved into learning Typescript and have found it to be quite a challenge, especially when dealing with modules.

While attempting to import typings using npm install -s @types/knockout, I noticed that most of the available typings are still written in Typescript 1.

Take for instance this typing definition from the es6-promise package:

declare module 'es6-promise' {
var foo: typeof Promise; // Temporary variable for referencing Promise locally
namespace rsvp {
    export var Promise: typeof foo;
    export function polyfill(): void;
}
export = rsvp;
} 

I wonder if there is a method to import the default export specified as export = xxx from Typescript 2?

Answer №1

A solution is available for incorporating TypeScript with ES Modules, although it may require adjustments. While TypeScript takes a different approach to ES Modules than anticipated, there are steps that can be taken to make it work.

export = rsvp

It’s important to note that this syntax does not constitute a default export in TypeScript.

To create a default export, the correct syntax would be:

export default rsvp;

The export = syntax specific to TypeScript CommonJS indicates an assignment to the module.exports property used within CommonJS modules.

To import it as the default, two actions must be taken:

  1. Set
    "allowSyntheticDefualtImports": true
    in your tsconfig.json
  2. Utilize an interop aware runtime like SystemJS for ES Module <-> CommonJS Module compatibility or incorporate Babel into your build process

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