Solution: Migrating a Kotlin/JVM project to KMP
First, you need to transform the build.gradle.kts configuration to Kotlin Multiplatform, and change the "kotlin("jvm")" plugin to "kotlin("multiplatform")". Then, you need to configure the targets. This is what this configuration might look like:
plugins {
kotlin("multiplatform") version "1.8.0"
application
}
group = "org.example"
version = "1.0-SNAPSHOT"
repositories {
mavenCentral()
}
kotlin {
jvm {
withJava()
}
js(IR) {
moduleName = "sudoku-generator"
browser()
binaries.library()
}
sourceSets {
val commonMain by getting {
dependencies {
implementation(
"org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4")
}
}
val commonTest by getting {
dependencies {
implementation(kotlin("test"))
}
}
val jvmMain by getting
val jvmTest by getting
val jsMain by getting
val jsTest by getting
}
}
Now move all your code from src/main/kotlin to src/commonMain/kotlin. Then move all your tests from src/test/kotlin to src/commonTest/kotlin.
In the tests, you need to replace the test annotations with those from the kotlin-test library.
You need to add a src/jsMain/kotlin folder and create a SudokuGeneratorJs.kt file in it. It could contain the following code:
@file:OptIn(ExperimentalJsExport::class)
import generator.SudokuGenerator
import solver.SudokuSolver
@JsExport
@JsName("SudokuGenerator")
class SudokuGeneratorJs {
private val generator = SudokuGenerator()
private val solver = SudokuSolver()
fun generateSudoku() = generator
.generate(solver)
.let {
Sudoku(it.solved.toJs(), it.sudoku.toJs())
}
}
@JsExport
class Sudoku(
val solved: Array<Array<Int?>>,
val sudoku: Array<Array<Int?>>
)
fun SudokuState.toJs(): Array<Array<Int?>> = List(9) { row ->
List(9) { col ->
val cell = this.cells[SudokuState.Position(row, col)]
when (cell) {
is SudokuState.CellState.Filled -> cell.value
is SudokuState.CellState.Empty, null -> null
}
}.toTypedArray()
}.toTypedArray()
