typeof in JavaScript returns a string. The TypeScript typings for Sequelize include return types of typeof Model. What does this mean and what is its purpose? I have looked through the documentation but could not find an explanation.
Link to Sequelize TypeScript typings
Link to Model TypeScript typings
Any insights would be appreciated. Thank you.
The class name reflects the specific type of an instance within a class (such as the output type of an expression like new Model()).
However, the class itself also possesses its own type. This type includes the constructor signature and the static members of the class. To access this type, you must use typeof ClassName.
A function that returns typeof Model indicates that it will yield a new class (not an instance) that is derived from Model.
You could then proceed to create an instance of the class:
let myModelClass = define(...);
let myModelInstance = new myModelClass()
Keep in mind, if you ever require the instance type of a class defined in this manner, you will need to utilize
InstanceType<typeof myModelClass>let myModel = define(...);
type myModel = InstanceType<typeof myModel>
let myModelInstance: myModel = new myModel()
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