diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..63eedb9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.gradle
+.idea
+build
+node_modules
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..44b196a
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,28 @@
+buildscript {
+    repositories {
+        jcenter()
+        maven { url "http://kotlin.bintray.com/kotlinx" }
+        maven { url "https://plugins.gradle.org/m2/" }
+    }
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath "com.moowork.gradle:gradle-node-plugin:$gradle_node_version"
+    }
+}
+
+allprojects {
+    group 'org.jetbrains'
+    version '1.0-SNAPSHOT'
+
+    repositories {
+        jcenter()
+        maven { url "http://kotlin.bintray.com/kotlinx" }
+    }
+
+    tasks.withType(Test) {
+        testLogging {
+            showStandardStreams = true
+            events "passed", "failed"
+        }
+    }
+}
diff --git a/common/build.gradle b/common/build.gradle
new file mode 100644
index 0000000..0d320a1
--- /dev/null
+++ b/common/build.gradle
@@ -0,0 +1,7 @@
+apply plugin: 'kotlin-platform-common'
+
+dependencies {
+    compile "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
+    testCompile "org.jetbrains.kotlin:kotlin-test-annotations-common:$kotlin_version"
+    testCompile "org.jetbrains.kotlin:kotlin-test-common:$kotlin_version"
+}
diff --git a/common/src/main/kotlin/Common.kt b/common/src/main/kotlin/Common.kt
new file mode 100644
index 0000000..97e8daf
--- /dev/null
+++ b/common/src/main/kotlin/Common.kt
@@ -0,0 +1,6 @@
+
+// This code is common across all backends
+class Common {
+    fun common(): String = "common"
+    fun platform(): String = Platform().platform() // delegates to platform-specific
+}
\ No newline at end of file
diff --git a/common/src/main/kotlin/ExpectPlatform.kt b/common/src/main/kotlin/ExpectPlatform.kt
new file mode 100644
index 0000000..4e446ae
--- /dev/null
+++ b/common/src/main/kotlin/ExpectPlatform.kt
@@ -0,0 +1,5 @@
+
+// This class is expected to have platform-specific impl
+expect class Platform() {
+    fun platform(): String
+}
\ No newline at end of file
diff --git a/common/src/test/kotlin/CommonTest.kt b/common/src/test/kotlin/CommonTest.kt
new file mode 100644
index 0000000..3089c01
--- /dev/null
+++ b/common/src/test/kotlin/CommonTest.kt
@@ -0,0 +1,13 @@
+import kotlin.test.*
+
+class CommonTest {
+    @Test
+    fun testCommon() {
+        assertEquals("common", Common().common())
+    }
+
+    @Test
+    fun testPlatform() {
+        assertTrue(Common().platform().startsWith("platform-"))
+    }
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..a34e71c
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,7 @@
+kotlin_version = 1.2.20
+
+gradle_node_version = 1.2.0
+node_version = 8.9.3
+npm_version = 5.5.1
+
+kotlin.incremental.multiplatform=true
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..236692e
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..9cd4350
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Wed Jan 24 17:11:50 MSK 2018
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..cccdd3d
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..f955316
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/js/build.gradle b/js/build.gradle
new file mode 100644
index 0000000..7a81c00
--- /dev/null
+++ b/js/build.gradle
@@ -0,0 +1,51 @@
+apply plugin: 'kotlin-platform-js'
+apply plugin: 'com.moowork.node'
+
+dependencies {
+    expectedBy project(':common')
+    compile "org.jetbrains.kotlin:kotlin-stdlib-js:$kotlin_version"
+    testCompile "org.jetbrains.kotlin:kotlin-test-js:$kotlin_version"
+}
+
+tasks.withType(compileKotlin2Js.getClass()) {
+    kotlinOptions {
+        moduleKind = "umd"
+        sourceMap = true
+        metaInfo = true
+    }
+}
+
+task populateNodeModules(type: Copy, dependsOn: compileKotlin2Js) {
+    from compileKotlin2Js.destinationDir
+    into "${buildDir}/node_modules"
+
+    afterEvaluate {
+        configurations.testCompile.each {
+            from zipTree(it.absolutePath).matching {
+                include '*.js'
+                include '*.js.map'
+            }
+        }
+    }
+}
+
+node {
+    version = "$node_version"
+    npmVersion = "$npm_version"
+    download = true
+}
+
+task installDependencies(type: NpmTask) {
+    args = ['install', 'mocha', 'source-map-support']
+    if (project.hasProperty("teamcity")) args += 'mocha-teamcity-reporter'
+}
+
+task prepareMocha(dependsOn: [compileTestKotlin2Js, populateNodeModules, installDependencies])
+
+task runMocha(type: NodeTask, dependsOn: prepareMocha) {
+    script = file('node_modules/mocha/bin/mocha')
+    args = [compileTestKotlin2Js.outputFile, '--require=source-map-support/register']
+    if (project.hasProperty("teamcity")) args += '--reporter=mocha-teamcity-reporter'
+}
+
+test.dependsOn runMocha
\ No newline at end of file
diff --git a/js/package-lock.json b/js/package-lock.json
new file mode 100644
index 0000000..a7f840d
--- /dev/null
+++ b/js/package-lock.json
@@ -0,0 +1,207 @@
+{
+  "name": "KotlinMultiplatformPlayground-js",
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "brace-expansion": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "dev": true,
+      "requires": {
+        "balanced-match": "1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
+    "commander": {
+      "version": "2.11.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.11.0.tgz",
+      "integrity": "sha512-b0553uYA5YAEGgyYIGYROzKQ7X5RAqedkfjiZxwi0kL1g3bOaBNNZfYkzt/CL0umgD5wc9Jec2FbB98CjkMRvQ==",
+      "dev": true
+    },
+    "concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
+    },
+    "debug": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+      "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+      "dev": true,
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "diff": {
+      "version": "3.3.1",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-3.3.1.tgz",
+      "integrity": "sha512-MKPHZDMB0o6yHyDryUOScqZibp914ksXwAMYMTHj6KO8UeKsRYNJD3oNCKjTqZon+V488P7N/HzXF8t7ZR95ww==",
+      "dev": true
+    },
+    "escape-string-regexp": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+      "dev": true
+    },
+    "fs.realpath": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
+      "dev": true
+    },
+    "glob": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
+      "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+      "dev": true,
+      "requires": {
+        "fs.realpath": "1.0.0",
+        "inflight": "1.0.6",
+        "inherits": "2.0.3",
+        "minimatch": "3.0.4",
+        "once": "1.4.0",
+        "path-is-absolute": "1.0.1"
+      }
+    },
+    "growl": {
+      "version": "1.10.3",
+      "resolved": "https://registry.npmjs.org/growl/-/growl-1.10.3.tgz",
+      "integrity": "sha512-hKlsbA5Vu3xsh1Cg3J7jSmX/WaW6A5oBeqzM88oNbCRQFz+zUaXm6yxS4RVytp1scBoJzSYl4YAEOQIt6O8V1Q==",
+      "dev": true
+    },
+    "has-flag": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
+      "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
+      "dev": true
+    },
+    "he": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/he/-/he-1.1.1.tgz",
+      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
+      "dev": true
+    },
+    "inflight": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
+      "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+      "dev": true,
+      "requires": {
+        "once": "1.4.0",
+        "wrappy": "1.0.2"
+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+      "dev": true
+    },
+    "minimatch": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "dev": true,
+      "requires": {
+        "brace-expansion": "1.1.8"
+      }
+    },
+    "minimist": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
+      "dev": true
+    },
+    "mkdirp": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "dev": true,
+      "requires": {
+        "minimist": "0.0.8"
+      }
+    },
+    "mocha": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-4.1.0.tgz",
+      "integrity": "sha512-0RVnjg1HJsXY2YFDoTNzcc1NKhYuXKRrBAG2gDygmJJA136Cs2QlRliZG1mA0ap7cuaT30mw16luAeln+4RiNA==",
+      "dev": true,
+      "requires": {
+        "browser-stdout": "1.3.0",
+        "commander": "2.11.0",
+        "debug": "3.1.0",
+        "diff": "3.3.1",
+        "escape-string-regexp": "1.0.5",
+        "glob": "7.1.2",
+        "growl": "1.10.3",
+        "he": "1.1.1",
+        "mkdirp": "0.5.1",
+        "supports-color": "4.4.0"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
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+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
+      "requires": {
+        "wrappy": "1.0.2"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
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+    },
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+    "source-map-support": {
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+      }
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+    "supports-color": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
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+      "dev": true,
+      "requires": {
+        "has-flag": "2.0.0"
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+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
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+}
diff --git a/js/package.json b/js/package.json
new file mode 100644
index 0000000..c0ebd55
--- /dev/null
+++ b/js/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "KotlinMultiplatformPlayground-js",
+  "description": "KotlinMultiplatformPlayground-js",
+  "license": "Apache-2.0",
+  "repository": "http://github.com/elizarov/KotlinMultiplatformPlayground",
+  "devDependencies": {
+    "mocha": "^4.1.0"
+  },
+  "dependencies": {
+    "source-map-support": "^0.5.2"
+  }
+}
diff --git a/js/src/main/kotlin/ActualPlatform.kt b/js/src/main/kotlin/ActualPlatform.kt
new file mode 100644
index 0000000..5086ed4
--- /dev/null
+++ b/js/src/main/kotlin/ActualPlatform.kt
@@ -0,0 +1,4 @@
+
+actual class Platform actual constructor() {
+    actual fun platform(): String = "platform-js"
+}
diff --git a/js/src/test/kotlin/ActualPlatformTest.kt b/js/src/test/kotlin/ActualPlatformTest.kt
new file mode 100644
index 0000000..35f0cd9
--- /dev/null
+++ b/js/src/test/kotlin/ActualPlatformTest.kt
@@ -0,0 +1,8 @@
+import kotlin.test.*
+
+class ActualPlatformTest {
+    @Test
+    fun testPlatform() {
+        assertEquals("platform-js", Platform().platform())
+    }
+}
diff --git a/jvm/build.gradle b/jvm/build.gradle
new file mode 100644
index 0000000..27c03cd
--- /dev/null
+++ b/jvm/build.gradle
@@ -0,0 +1,15 @@
+apply plugin: 'kotlin-platform-jvm'
+
+dependencies {
+    expectedBy project(':common')
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
+    testCompile "junit:junit:4.12"
+    testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
+    testCompile "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
+}
+
+tasks.withType(compileKotlin.getClass()) {
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
diff --git a/jvm/src/main/kotlin/ActualPlatform.kt b/jvm/src/main/kotlin/ActualPlatform.kt
new file mode 100644
index 0000000..5633817
--- /dev/null
+++ b/jvm/src/main/kotlin/ActualPlatform.kt
@@ -0,0 +1,4 @@
+
+actual class Platform actual constructor() {
+    actual fun platform(): String = "platform-jvm"
+}
diff --git a/jvm/src/test/kotlin/ActualPlatformTest.kt b/jvm/src/test/kotlin/ActualPlatformTest.kt
new file mode 100644
index 0000000..5c50ecb
--- /dev/null
+++ b/jvm/src/test/kotlin/ActualPlatformTest.kt
@@ -0,0 +1,8 @@
+import kotlin.test.*
+
+class ActualPlatformTest {
+    @Test
+    fun testPlatform() {
+        assertEquals("platform-jvm", Platform().platform())
+    }
+}
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..ef158d1
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,5 @@
+rootProject.name = 'KotlinMultiplatformPlayground'
+
+include 'common'
+include 'jvm'
+include 'js'