Error casting SequelizeStaticAndInstance.Model to Model

[louy]

Reported by @Thylossus in #14.

Changed type of return value of Model<TInstance, TAttributes>.scope from this to Model<TInstance, TAttributes>. The following example in https://github.com/Thylossus/sequelize-pull-request-justification-demo/tree/master tries to mimic the example from https://github.com/louy/typed-sequelize/blob/master/README.md.

However, I cannot compile this example due to a type error:

index.ts(16,16): error TS2322: Type 'sequelize.Model<Thing, ThingInstance>' is not assignable to type 'sequelize.SequelizeStaticAndInstance.Model<Thing, ThingInstance>'.
  Types of property 'scope' are incompatible.
    Type '(options?: string | string[] | ScopeOptions | WhereOptions) => Model<Thing, ThingInstance>' is not assignable to type '(options?: string | string[] | ScopeOptions | WhereOptions) => this'.
      Type 'Model<Thing, ThingInstance>' is not assignable to type 'this'.

This is probably related to microsoft/TypeScript#5863. Changing the return type of scope solves the error for me.
Of course, this is not a sufficient criterion for changing your code, but I believe that isn't working for anyone. Feedback about the correctness of this assumption is very welcome.

[louy]

Interestingly, this only happens if you use import {Model, Instance} from 'sequelize'; instead of import * as Sequelize from 'sequelize';.
My guess is that it has something to do with the way we use export =. Could be related to microsoft/TypeScript#5863 but it's not the same issue.