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Add Kotlin/JS legacy backend removal information #3723

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Aug 3, 2023
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Add Kotlin/JS legacy backend removal information #3723

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2821c94
Add Kotlin/JS legacy backend removal information
anton-bannykh Aug 2, 2023
f8fb1a4
update: update js-ir-compiler.md wording
koshachy Aug 3, 2023
50ea132
update: update whatsnew19.md wording
koshachy Aug 3, 2023
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6 changes: 5 additions & 1 deletion docs/topics/js/js-ir-compiler.md
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Expand Up @@ -23,9 +23,13 @@ kotlin {
```

* `IR` uses the new IR compiler backend for Kotlin/JS.
* `LEGACY` uses the default compiler backend.
* `LEGACY` uses the old compiler backend.
* `BOTH` compiles your project with the new IR compiler as well as the default compiler backend. Use this mode for [authoring libraries compatible with both backends](#authoring-libraries-for-the-ir-compiler-with-backwards-compatibility).

> The old compiler backend has been deprecated since Kotlin 1.8.0. Starting with Kotlin 1.9.0, using compiler types `LEGACY` of `BOTH` leads to an error.
>
{type="warning"}

The compiler type can also be set in the `gradle.properties` file, with the key `kotlin.js.compiler=ir`.
This behaviour is overwritten by any settings in the `build.gradle(.kts)`, however.

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12 changes: 10 additions & 2 deletions docs/topics/whatsnew19.md
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Expand Up @@ -598,9 +598,10 @@ fun computeAck(m: Int, n: Int) {

## Kotlin/JS

This release introduces updates for Kotlin/JS, including the deprecation of the Kotlin/JS Gradle plugin and Experimental
This release introduces updates for Kotlin/JS, including the removal of the old Kotlin/JS compiler, Kotlin/JS Gradle plugin deprecation and Experimental
support for ES6:

* [Removal of the old Kotlin/JS compiler](#removal-of-the-kotlin-js-legacy-target)
* [Deprecation of the Kotlin/JS Gradle plugin](#deprecation-of-the-kotlin-js-gradle-plugin)
* [Deprecation of external enum](#deprecation-of-external-enum)
* [Experimental support for ES6 classes and modules](#experimental-support-for-es6-classes-and-modules)
Expand All @@ -612,6 +613,13 @@ support for ES6:
{type="note"}


### Removal of the old Kotlin/JS compiler

In Kotlin 1.8.0, we [announced](whatsnew18.md#stable-js-ir-compiler-backend) that the IR-based backend became [Stable](components-stability.md).
Since then, not specifying the compiler has become an error, and using the old compiler leads to warnings.

In Kotlin 1.9.0, using the old backend results in an error. Please migrate to the IR compiler by following our [migration guide](js-ir-migration.md).

### Deprecation of the Kotlin/JS Gradle plugin

Starting with Kotlin 1.9.0, the `kotlin-js` Gradle plugin is
Expand Down Expand Up @@ -1227,4 +1235,4 @@ If the repository is not specified, Gradle uses the sunset JCenter repository, w

Kotlin 1.9.0 is a [feature release](kotlin-evolution.md#feature-releases-and-incremental-releases) and can, therefore,
bring changes that are incompatible with your code written for earlier versions of the language. Find the detailed list
of these changes in the [Compatibility guide for Kotlin 1.9.0](compatibility-guide-19.md).
of these changes in the [Compatibility guide for Kotlin 1.9.0](compatibility-guide-19.md).
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