duplexify ts subclass

README.md

microsoft/TypeScript#19675

$ npm install
$ npx tsc

index.ts:3:24 - error TS2507: Type '{ default: DuplexifyConstructor; obj(writable?: Writable | undefined, readable?: Readable | undefined, streamOptions?: DuplexOptions | undefined): Duplexify; }' is not a constructor function type.

3 class MyDuplex extends Duplexify {}
                         ~~~~~~~~~


Found 1 error.

index.ts

import * as Duplexify from 'duplexify';

class MyDuplex extends Duplexify {}
console.log(new MyDuplex());

package.json

{
  "dependencies": {
    "@types/duplexify": "^3.6.0",
    "duplexify": "^4.0.0",
    "typescript": "^3.3.3333"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "outDir": "./build",
    "rootDir": "./",
    "strict": true,
    "types": ["node"],
    "esModuleInterop": true
  }
}