Sequelize 7 is still in alpha but if you're OK with the limitations, it's not a bad idea to start using it.

One of the selling points of v7 is that we rewrote a big part of it to be typescript-friendly

You can take a look at the progress of Sequelize 7 here:Roadmap (view)

Here is what is likely to impact you:

• sequelize-cli does not support Sequelize 7 yet. If you want to use migrations, you would need to use umzug or another migration library instead
• If you use third-party libraries, they are unlikely to work with Sequelize 7 for the time being
• A few decorators from Sequelize-TypeScript are still missing:Status of merge with sequelize-typescript #15334
• Model inheritance is not ready Done
• There is a minor bug with belongsTo (with workaround):MultiplebelongsTo associations in same model to same target not working with inverse #15625, which will be fixed before the stable release. Fixed
• The new documentation does not describe how to use association decorators yet. They work very similarly to how they did in Sequelize-TypeScript. Done

If you want to use Sequelize 7, I recommend reading the documentation from this PR:sequelize/website#330 (comment). The documentation is available onhttps://sequelize.org. Don't hesitate to ask questions as it will help us improve the documentation