Update code to 1.4

Update Gradle to 6.6
Update dependency versions to 1.4-compatible libraries
Add explicit versions to NPM dependencies
Use new Gradle DSL for configuring Kotlin/JS
Move kotlin.browser to kotlinx.browser

Author: SebastianAigner

build.gradle.kts

@@ -1,5 +1,5 @@
 plugins {
-    id("org.jetbrains.kotlin.js") version "1.3.70-eap-184"
+    id("org.jetbrains.kotlin.js") version "1.4.0"
 }
 
 group = "org.example"
@@ -12,28 +12,33 @@ repositories {
     jcenter()
 }
 
+kotlin {
+    js {
+        browser {}
+        binaries.executable()
+    }
+}
+
 dependencies {
     implementation(kotlin("stdlib-js"))
 
     //React, React DOM + Wrappers (chapter 3)
-    implementation("org.jetbrains:kotlin-react:16.13.0-pre.94-kotlin-1.3.70")
-    implementation("org.jetbrains:kotlin-react-dom:16.13.0-pre.94-kotlin-1.3.70")
+    implementation("org.jetbrains:kotlin-react:16.13.1-pre.110-kotlin-1.4.0")
+    implementation("org.jetbrains:kotlin-react-dom:16.13.1-pre.110-kotlin-1.4.0")
     implementation(npm("react", "16.13.1"))
     implementation(npm("react-dom", "16.13.1"))
 
     //Kotlin Styled (chapter 3)
-    implementation("org.jetbrains:kotlin-styled:1.0.0-pre.94-kotlin-1.3.70")
-    implementation(npm("styled-components"))
-    implementation(npm("inline-style-prefixer"))
+    implementation("org.jetbrains:kotlin-styled:1.0.0-pre.110-kotlin-1.4.0")
+    implementation(npm("styled-components", "~5.1.1"))
+    implementation(npm("inline-style-prefixer", "~6.0.0"))
 
     //Video Player (chapter 7)
-    implementation(npm("react-player"))
+    implementation(npm("react-player", "~2.6.0"))
 
     //Share Buttons (chapter 7)
-    implementation(npm("react-share"))
+    implementation(npm("react-share", "~4.2.1"))
 
     //Coroutines (chapter 8)
-    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.3.5")
-}
-
-kotlin.target.browser { }
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9")
+}

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

src/main/kotlin/Main.kt

@@ -1,4 +1,4 @@
-import kotlin.browser.document
+import kotlinx.browser.document
 
 fun main() {
     document.bgColor = "blue"