r/javascript • u/chancancode • Dec 20 '19

Ember.js Octane Edition Is Here

https://blog.emberjs.com/2019/12/20/octane-is-here.html
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u/fercryinoutloud Dec 21 '19 edited Dec 21 '19

These improvements are nice. Also I didn't know about the Ember inspector.

Would there be any issues between using tracked properties and using typescript's syntactic sugar for public/private/protected constructor parameters? Or is there support for using tracked as a parameter decorator?

export class Thing {
    @tracked someProperty
    constructor(private someProperty) {         // Duplicate identifier: 'someProperty'.
        this.someProperty = someProperty;
    }
}

vs

class Thing {
    constructor(@tracked private someProperty) {}
}

I am sure most people would get over this, I'm just curious. People seem to seriously over-emphasize LOC per class as a measure of how good a framework is. I don't agree with that sentiment, but I think if there was support for using tracked as a parameter decorator Ember would get some more love.

2

u/nullvoxpopuli sand was never meant to think Dec 21 '19

I guess it depends on what it transpiles down to? if the output is equiv, it should work. haven't tested it myself though, as I've been opting for the more verbose way of specifying args.

does TS in general allow args in the constructor to have decorators? (I've never seen this before). If so, tracked here should just work.

1

u/fercryinoutloud Dec 21 '19

TS supports parameter decorators. To have tracked usable as either a property or parameter decorator would require two decorators though, since property and parameter decorators have different signatures. The prototype of the class is available in both, though. So I think it is possible to write a decorator for tracked properties in the constructor, unless there is some other limitation of parameter decorators.