Type Error with Shape and BoxShape in TypeScript

So, I was getting started with some examples and creating a body with a fixture. The example HeavyOnLight has the code:

world.createDynamicBody(Vec2(0.0, 4.5)).createFixture(pl.Circle(0.5), 10.0);

since I am using TypeScript, my code is:

import pl from 'planck-js'
let world = new pl.World()
world.createBody().createFixture(pl.Box(100, 100))

TypeScript underlines the pl.Box part and says:

No overload matches this call.
  Overload 1 of 3, '(def: FixtureDef): Fixture', gave the following error.
    Argument of type 'BoxShape' is not assignable to parameter of type 'FixtureDef'.
      Type 'BoxShape' is missing the following properties from type 'FixtureDef': shape, userData, friction, restitution, and 5 more.
  Overload 2 of 3, '(shape: Shape, opt?: FixtureOpt | undefined): Fixture', gave the following error.
    Argument of type 'BoxShape' is not assignable to parameter of type 'Shape'.
      Type 'BoxShape' is missing the following properties from type 'Shape': m_type, m_radius, isValid, getRadius, and 7 more.
  Overload 3 of 3, '(shape: Shape, density?: number | undefined): Fixture', gave the following error.
    Argument of type 'BoxShape' is not assignable to parameter of type 'Shape'.

What am I doing wrong? It seems that BoxShape should be a child of Shape, but it isn’t? How can I add a fixture to a body?

EDIT: this happens with pl.Circle too, the error is Argument of type 'CircleShape' is not assignable to parameter of type 'Shape'.

I am using "planck-js": "^0.3.22" and "typescript": "^3.9.7"

[Doeke]

I also encountered type errors with both Shapes and Fixture options object. I’m using the following workaround for now:

import { Shape } from 'planck-js/lib/shape/index'

const shape = Circle(Vec2(0, 0), 2) as unknown as Shape
this.fixture = this.body.createFixture(shape)
this.fixture.setSensor(true)

[zOadT]

PR #146 should fix this issue, it applies the suggestion of @Doeke. It would be great if you two could take a quick look at it. Unfortunately the same problems apply to the joint typings. I will fix these later in a separate PR.