Sequelize - Writing model types with .d.ts - everything is optional?

Issue

I'm trying to use .d.ts files to write type definitions for sequelize models in my JS. I have most of it working, however, all the properties are showing as optional in Model.create().

index.d.ts:

interface MyModelSchema extends Model<InferAttributes<MyModelSchema>, InferCreationAttributes<MyModelSchema>> {
  id: CreationOptional<string>;
  some_required_property: number;
  some_optional_property?: number;
}

type MyModel = ModelStatic<MyModelSchema>;
declare const MyModel: MyModel;

index.js: (MyModel is showing the correct type)

// Properties on document are correctly marked as required
const document = MyModel.create({
  // All properties are optional here
});

Solution

Turns out that all along I was just missing "strictNullChecks": true, in my jsconfig.json.

Answered By - asportnoy