fix: TypeScript model generation - use declare on all class fields and methods

[duki994]

Summary

• Fixes TypeScript model generation
• Related to issue Model generated - Declaring public class fields error - Typescript #600
• declare all class fields … https://sequelize.org/docs/v6/core-concepts/model-basics/#caveat-with-public-class-fields

Description

All model classes were generated without declare keyword which made TypeScript to shadow Sequelize generated models.

Future plans

Create a PR with changes to code to use new InferAtributes and InferCreationAttributes

[jmfirth-arkane]

We would like to see this merged as it is currently causing issues in our TypeScript/ES2022 target codebase. What needs to be done to see this included?

[duki994]

We would like to see this merged as it is currently causing issues in our TypeScript/ES2022 target codebase. What needs to be done to see this included?

Haven't worked in JS/TS ecosystem for a while.

I'll commit some of my OSS time to fix the issues as this modification had so many use cases across all TS projects I ever did.

[csimpsonprepsportswear]

I too would like this merged as the lack of declare on TypeScript fields is causing problems using the models generated by this.

[xorweak]

I need this too.

[jlssmt]

please merge this...
should be a very fast review and a big bug fix...