TypeScript 5.0 retools decorators
InfoWorld | at | by Mike
Microsoft published a beta release of TypeScript 5.0, the company’s strongly typed JavaScript variant, on January 26. The new release aims to modernize decorators for class customization.Decorators, an upcoming ECMAScript feature, allow for customizing classes and their members in a reusable way, Microsoft noted in a blog post announcing the release. Decorators can be used on methods, properties, getters, setters, and auto-accessors. Classes can be decorated for subclassing and registration. While TypeScript previously supported experimental decorators, these were modeled on a much older version of the decorators proposal.Also in TypeScript 5.0, developers now can add a const modifier to a type parameter declaration to cause const-like inferences to be the default. The update also now allows the extends field to take multiple entries, and it makes all enums union enums by creating a unique type for each computed member. This means all enums can be narrowed and have their members referenced as types.