Hi there! We announce 1.3.70 EAP (<https://discuss.kotlinlang.org/t/kotlin-1-3-70-early-access-previ...

# javascript

[Ilya Goncharov [JB]]

Hi there! We announce 1.3.70 EAP (https://discuss.kotlinlang.org/t/kotlin-1-3-70-early-access-preview/15876)
It brings some Kotlin/JS related stuff, including long awaited support of DCE in js plugin

[ankushg]

Any links to info about DCE support in JS plugin? Doesn’t look like the EAP notes mention it by name

[Ilya Goncharov [JB]]

The first and the second points in EAP notes are about optimized bundle (that includes DCE)

[ankushg]

Ah ok, are things like dceOptions.keep configured the same way as it was with the old plugin?

[Ilya Goncharov [JB]]

Yes
It is configured under js target via dceTask

kotlin {
    target { // or js for mpp
        dceTask {
            // dceOptions.keep and so on
        }
    }
}

[Nikky]

is this eap compatible with the kotlin-wrapper versions 16.9.0-pre.87-kotlin-1.3.70-dev-2420-ir-02 ?

if not.. hope there will be a compatible release soon

[Gurupad Mamadapur [FH]]

@Nikky Looks like they (also stdlib-js) are available in kotlin-dev repo

[Nikky]

well they are available.. but i am not sure if they are compatible
and testing it out is a bit inconvenient for me since i use a few other dependencies that have yet to be recompiled for the new IR format

[Ilya Goncharov [JB]]

@Nikky IR format is not used by default in this release
In 1.3.70 old compiler backend is used

[Nikky]

so old libraries should work?
thats good to know

[Ilya Goncharov [JB]]

kotlin-wrappers should be published while 1.3.70 will be released, for EAP it is not provided

[Nikky]

well from what i can tel lthe improvements in size is pretty good
it seems that it uses dce for webpack whether the plugin is enabled or not ?
i see the step processDceKotlinJs

so is the dce plugin not needed anymore ?

[Ilya Goncharov [JB]]

so is the dce plugin not needed anymore ?

Yes, now DCE tool run is integrated in Kotlin/JS gradle plugin, and you don’t need to apply dce plugin explicitly

[Nikky]

i am seeing pretty good results though.. my old output was 28M
dev is now 23 M
and production is down to 2.4M ❤️

also the webpack tasks now package up the resources (index.html, etc)
so not more need to make extra tasks for them.. this is such a improvement

[patrickdelconte]

finally the tests getting some love 🙂 I look forward to trying it out

[Gurupad Mamadapur [FH]]

Hi @Ilya Goncharov [JB] thanks for the update. The ktor client runs into some dce error in production mode. -

starter.js:39 Uncaught TypeError: b is not a function
    at Object.l (starter.js:39)
    at Object.<anonymous> (starter.js:39)
    at n (bootstrap:19)
    at Object.<anonymous> (starter.js:39)
    at n (bootstrap:19)
    at Object.<anonymous> (starter.js:39)
    at n (bootstrap:19)
    at Object.<anonymous> (starter.js:39)
    at n (bootstrap:19)
    at bootstrap:83

[Gurupad Mamadapur [FH]]

Will soon share a reproducible code. Should I file this issue on youtrack?

[Ilya Goncharov [JB]]

Reproducible code would be very informative
Yes, feel free to add issue

Could you please answer some additional related questions?
Did you apply dce plugin manually earlier (in 1.3.60 e.g.)? Did it work with js and dce plugin separately?
Does it work in development mode? For example, if you run your application (it is run with browserDevelopmentRun task)?

[Gurupad Mamadapur [FH]]

Repro - https://github.com/Protino/testkotlinjs

Did you apply dce plugin manually earlier (in 1.3.60 e.g.)? Did it work with js and dce plugin separately?

No, I had not. Haven't tried using dce plugin separately yet. Will try.

Does it work in development mode? For example, if you run your application (it is run with browserDevelopmentRun task)?

Yep, it works in dev mode.

[Ilya Goncharov [JB]]

Thank you!

No, I had not. Haven’t tried using dce plugin separately yet. Will try.

It is just for information, is this regression relative to previous version, and is it related with js-dce link, or maybe dce only problem

[Gurupad Mamadapur [FH]]

Ok. Just to let you know, can't use dce with 1.3.61, running into https://youtrack.jetbrains.com/issue/KT-35855


@Ilya Goncharov [JB]
Let me know if you need any other help, thanks!

[bashor]

@Gurupad Mamadapur [FH] please try next workaround in your project and let us know about result:

...
browser {
            dceTask {
                dceOptions {
                    keep("ktor-ktor-io.\$\$importsForInline\$\$.<http://ktor-ktor-io.io.ktor.utils.io|ktor-ktor-io.io.ktor.utils.io>")
                }
            }
        }
...

[Ilya Goncharov [JB]]

cc @Gurupad Mamadapur [FH]

[Gurupad Mamadapur [FH]]

Hi @bashor @Ilya Goncharov [JB] the workaround works, Thanks!