按照github上的教程，我正在Kotlin 1.4-M2的多平台项目中对Kotlin seriazliation进行测试驱动，但是我没有得到要编译的序列化位。

这是我的build.gradle.kts

plugins {
    val kotlinVersion = "1.4-M2"
    kotlin("multiplatform") version kotlinVersion
    kotlin("plugin.serialization") version kotlinVersion
}

repositories {
    mavenCentral()
    maven {
        url = uri("https://dl.bintray.com/kotlin/kotlin-eap")
    }
    maven {
        url = uri("https://kotlin.bintray.com/kotlinx")
    }
    jcenter()
    gradlePluginPortal()
}

kotlin {
    jvm {
        compilations.all {
            kotlinOptions.jvmTarget = "11"
        }
    }
    js(IR) {
        moduleName = "hotel"
        browser {
            dcetask {
                keep(
                   ...
                )
            }
            binaries.executable()
        }
    }

    sourceSets {

        // val serializationVersion = "0.20.0-1.4-M2"
        val serializationVersion = "0.20.0"

        val commonmain by getting {
            dependencies {
                implementation(kotlin("stdlib-common"))
                implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serializationVersion")
            }
        }
        val commonTest by getting {
            dependencies {
                implementation(kotlin("test-common"))
                implementation(kotlin("test-annotations-common"))
            }
        }
        val jvmMain by getting {
            dependencies {
                implementation(kotlin("stdlib-jdk8"))
                implementation(kotlin("reflect"))
                implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serializationVersion")
            }
        }
        val jvmTest by getting {
            dependencies {
                implementation(kotlin("test-junit"))
            }
        }
        val jsMain by getting {
            dependencies {
                implementation(kotlin("stdlib-js"))
                implementation("org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serializationVersion")
            }
        }
        val jsTest by getting {
            dependencies {
                implementation(kotlin("test-js"))
            }
        }
        all {
            languageSettings.enableLanguageFeature("Inlineclasses")
        }
    }
}

我已经在一个简单的数据类上尝试过

@Serializable
data class Test(

    val blah: Int = 0

)

import kotlinx.serialization.json.Json <<<--- Unresolved reference: kotlinx
import kotlinx.serialization.json.Jsonconfiguration <<<--- Unresolved reference: kotlinx
import kotlin.js.ExperimentalJsExport
import kotlin.js.JsExport

...

fun main() {
    val json = Json(Jsonconfiguration.Default)
    val jstring = json.toJson(Test.serializer(),Test(blah = 3))
    println(jstring.toString())
}

它在抱怨Unresolved reference: kotlinx

是否需要做一些特定的事情才能使kotlinx导入正常工作？或者我应该使用不同版本的序列化程序库吗？