🐈 Daniel Rosenwasser Announced TypeScript 5.0 Beta

TypeScript 5.0 Beta finally makes decorators a standard feature!

Daniel Rosenwasser just announced TypeScript 5.0 beta. I will walk you through the most important features added in this version. Let’s start:

Decorators

Decorators in EcmaScript were proposed four years ago, and while some transpilers offered them, they didn’t land so far in the EcmaScript standard. They are now on stage 3 meaning it is a draft waiting for the final feedback. When reaching stage 4 decorators will wait for the next release to be made, and become a standard.

Decorators were offered by the TypeScript as an experimental feature that you were able to enable with “experimentalDecorators”: true. Now, they land in the official TypeScript beta, meaning you won’t have to enable them, so they may get some more traction.

Here is the example from the announcement:

    @loggedMethod
    greet() {
        console.log(`Hello, my name is ${this.name}.`);
    }

And here is the decorator:

function loggedMethod(originalMethod: any,
    context: ClassMethodDecoratorContext) {
    const methodName = String(context.name);

    function replacementMethod(
      this: any…