Typescript Declare Class Type

Question

In Javascript I have:

var session = require('express-session');
var SequelizeStore = require('connect-session-sequelize')(session.Store);
new SequelizeStore({
    db: sequelize
});

I set these types:

function ConnectSessionSequelize(store: expressSession.IBaseStore): expressSession.IBaseStore;

This fails because expressSession.IBaseStore refers to an instance type, not a class type. Is there a way to specify class types, similar to Java: Class<expressSession.IBaseStore>?

Currently I'm using function CoSeSe(store: Function): Function, but this has major type leakage!

it sounds like Store should inherit or extend IBaseStore. does it? — toskv
– toskv, Commented Feb 20, 2016 at 19:08
It implements it: export class Store implements IBaseStore. — Exegesis
– Exegesis, Commented Feb 20, 2016 at 19:58

Ryan Cavanaugh · Accepted Answer · 2016-02-21 07:18:55Z

2

The syntax typeof SomeClass will give you the type of the constructor function SomeClass (e.g. the type of x if you wrote let x = SomeClass) rather than the instance side (e.g. the type of y if you wrote let y = new SomeClass()).

answered Feb 21, 2016 at 7:18

Ryan Cavanaugh

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1 Comment

Exegesis Over a year ago

You are truly amazing: function CoSeSe(store: typeof expressionSession.Store): typeof expressionSession.Store.

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