Alyx

## PR Description This PR migrates DataTypes to TypeScript. It continues the work that was started in the previous DataType PRs by @AllAwesome497 Closes https://github.com/sequelize/sequelize/pull/14240 - @AllAwesome497's refactor Closes https://github.com/sequelize/sequelize/pull/14239...

feat: implement proper schema support in mysql, snowflake, add `queryInterface.listDatabases`

3

## Pull Request Checklist - [x] Have you added new tests to prevent regressions? - [x] Does `yarn test` or `yarn test-DIALECT` pass with this change (including linting)? - [x]...

feat: add `queryInterface.changeColumns`, fix many bugs with `changeColumn`

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## Description Of Change Closes #14477 Closes https://github.com/sequelize/sequelize/issues/15522 Closes #7649 Closes #15285 Closes https://github.com/sequelize/sequelize/issues/9635 Closes https://github.com/sequelize/sequelize/issues/13167 The initial goal of this PR was to investigate [a bug reported here](https://github.com/sequelize/sequelize/issues/9058#issuecomment-1165615540), it...

[RFC] Decorators

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This is a long one, bear with me. I'd like to bring built-in support for decorator based model declaration in Sequelize. It's one of the main arguments I've seen in...

Different dists for CJS and ESM are causing both to be used, leading to TypeScript problems

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### Issue Description `@apollo/server` provides different builds for ESM and CJS. It is great to see more ESM support, but the current approach means it suffers from the [Dual package...

Add support for Repositories / Data Mapper

5

## Issue Creation Checklist - [x] I understand that my issue will be automatically closed if I don't fill in the requested information - [x] I have read the [contribution...

## Pull Request Checklist - [x] Have you added new tests to prevent regressions? - [ ] If a documentation update is necessary, have you opened a PR to [the...

feat!: add `model` parameter on model hooks run on `sequelize` if they don't have an instance, add `afterCount`

1

## Pull Request Checklist - [ ] Have you added new tests to prevent regressions? - [ ] If a documentation update is necessary, have you opened a PR to...

`Model.destroyMany` to destroy many instances in one query

2

## Issue Creation Checklist - [x] I understand that my issue will be automatically closed if I don't fill in the requested information - [x] I have read the [contribution...

I use https://github.com/lmichelin/open-github-links-in-ide to open VSCode from GitHub, but that extension can only open files and I would like to make it open this extension's PR file diff view instead...