Reason/Context

TypeScript provides a really good set of features on top of Javascript. It is very opinionated and used widely across the whole OSS scene.

Some of the features I consider very interesting here are Static (or strict) typing and OOP syntax models including interfaces, classes, enums, etc.

All those things improve not only the Developer Experience but codes stability and resiliency by:

• Early catching errors.
• Improving code reusability.
• Improving code extensibility.
• Making (unit) testing a more thorough thing.
• Having a nice IDE integration.
• Etc.

Definitely, it drives us through the road of Producing software that can be easily extended, reusable, and highly testable.

Considering the Road to v2.0.0 and the fact major changes are going to happen, such as a complete rewrite of the API of the parser (See #453), or the rewrite we plan to do for the parsing logic integrating Spectral (See #477), I can't think of a better time to move forward with this task.

Description

To rewrite/migrate the entire parser-js library in TypeScript.
We should create PR's targeting next-major branch if we finally want this to happen in v2.0.0.

This development also includes porting the new Parser-API based on the latest implementation that can be found here: #497 (comment)