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proposal-class-method-parameter-decorators
Decorators for ECMAScript class method and constructor parameters
2016-07 – Stage 2. After the decorators proposal reached stage 2, its API began to undergo significant changes. Furthermore, at one point the proposal was referred to as "ESnext class features for JavaScript." During its development, there were numerous ideas about how decorators could be structured. To get a comprehensive view of the entire history of changes, I recommend reviewing the commits in the proposal's repository. Here is an example of what the decorators API used to look like:
Indeed, numerous proposals and extensions are being considered to enhance the decorators specification further. Some of these proposals like the Decorator Metadata, are already under consideration even though the core decorator specification has not yet been standardized. This underscores the idea that decorators have a promising future in the specification and we can hope to see them become a part of the standard in the near future.
The next example will come from the React-world. Although the use of Higher-Order Components (HOC) is becoming less common in applications built with this library, HOCs still serve as a good and well-known example of decorator usage.
2022-11 – Announcing TypeScript 4.9. ECMAScript decorators were listed in TS 4.9 Iteration Plan. However, after some time, the TS team decided to move decorators to the 5.0 release. Here is the authors' comment:
2023-05 – Angular v16 is here. Angular 16 also added support for ECMAScript decorators. However, some other frameworks built around decorators (and which were inspired by Angular?) have stated that they will not make changes toward ECMAScript decorators for now. For many of them, two important aspects are Metadata and Parameter decorators.
Indeed, decorators will bring significant changes to how we write applications today. Perhaps not immediately, as the current specification primarily focuses on classes, but with all the additions and ongoing work JavaScript code in many applications will soon look different. We are now closer than ever to the moment when we can finally see those ones that are real decorators in the specification. It is an exciting development that promises to enhance the expressiveness and functionality of JavaScript applications.
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