4.0

I wanted to push the discussion around 4.0 a little bit, summarize what is left to decide so 4.0 can be developed / released, and make a proposal:

• Support only Node >4 #5205. Benefits: native classes, native Promises, arrow functions. Implies #5878
• ES6 in Sequelize codebase #3951 (without Babel, classes, arrow functions)
• Make instances instanceof Model (with native classes) #5877
  • Better OOP semantics
  • define() still works as Model factory
  • users can extend Sequelize.Model
    • awesome for type-safety / autocompletion
    • alternative to classMethods / instanceMethods / getterMethods / setterMethods
  • Model.init() static initializer attaches attribute metadata to the model
    • third-party module can define class/attribute decorators that does this for users of TypeScript / Babel - decorators are the perfect semantic for defining additional metadata for Sequelize on the attributes
  • Need some way to register a model to a Sequelize instance / model manager, sequelize.add(Model)?

Other than that, keep the API / concept changes small. Let users still use define() like they are used to, but enable users of TS / Babel to explore new ways of defining models.

[ralusek]

@janmeier any update on when this is expected to release?

[janmeier]

@ralusek Hopefully soon 😃 - It’s getting closer at least. Docs are done now, but we’d still like to address a couple of things related to where conditions