Deprecate helper method unrelated to nodejs

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/TestHelper.scala

@@ -0,0 +1,7 @@
+package io.scalajs.nodejs
+
+import scala.scalajs.js
+
+object TestHelper {
+  def isDefined(obj: js.Any): Boolean = obj != null && !js.isUndefined(obj)
+}

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/child_process/ChildProcessTest.scala

@@ -2,7 +2,7 @@ package io.scalajs.nodejs
 package child_process
 
 import io.scalajs.nodejs.buffer.Buffer
-import io.scalajs.util.ScalaJsHelper._
+import io.scalajs.nodejs.TestHelper._
 import io.scalajs.util.NodeJSConverters._
 
 import scala.concurrent.{ExecutionContext, Promise}

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/fs/FsTest.scala

@@ -2,7 +2,7 @@ package io.scalajs.nodejs.fs
 
 import io.scalajs.nodejs.setImmediate
 import io.scalajs.util.NodeJSConverters._
-import io.scalajs.util.ScalaJsHelper._
+import io.scalajs.nodejs.TestHelper._
 
 import scala.concurrent.{ExecutionContext, Promise}
 import org.scalatest.funspec.AsyncFunSpec

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/os/OSTest.scala

@@ -1,6 +1,6 @@
 package io.scalajs.nodejs.os
 
-import io.scalajs.util.ScalaJsHelper._
+import io.scalajs.nodejs.TestHelper._
 import org.scalatest.funspec.AnyFunSpec
 
 /**

app/nodejs-v10/src/test/scala/io/scalajs/nodejs/url/URLObjectTest.scala

@@ -1,9 +1,10 @@
 package io.scalajs.nodejs
 package url
 
-import io.scalajs.util.JSONHelper._
 import org.scalatest.funspec.AnyFunSpec
 
+import scala.scalajs.js
+
 /**
   * URLObject Tests
   */
@@ -14,7 +15,7 @@ class URLObjectTest extends AnyFunSpec {
 
     it("should break down URLs into components") {
       assert(
-        urlObject.toJson === "\"https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=node\""
+        js.JSON.stringify(urlObject) === "\"https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=node\""
       )
       //  """{"protocol":"https:","slashes":true,"auth":null,"host":"www.google.com","port":null,"hostname":"www.google.com","hash":"#q=node","search":"?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8","query":"sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8","pathname":"/webhp","path":"/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8","href":"https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=node"}"""
     }

core/src/main/scala/io/scalajs/util/DateHelper.scala

@@ -6,12 +6,14 @@ import scala.scalajs.js
 /**
   * Date Helper
   */
+@deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
 object DateHelper {
 
   /**
     * Date Enrichment
     * @param date0 the given [[js.Date date]]
     */
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class DateEnrichment(private val date0: js.Date) extends AnyVal {
     @inline
     def +(duration: Duration) = new js.Date(date0.getTime() + duration.toMillis)
@@ -39,6 +41,7 @@ object DateHelper {
     * Duration Enrichment
     * @param duration the given [[Duration duration]]
     */
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class DurationEnrichment(private val duration: Duration) extends AnyVal {
     @inline
     def +(date: js.Date) = new js.Date(date.getTime() + duration.toMillis)

core/src/main/scala/io/scalajs/util/JSONHelper.scala

@@ -5,12 +5,14 @@ import scala.scalajs.js
 /**
   * JSON Helper
   */
+@deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
 object JSONHelper {
 
   /**
     * JSON Conversions
     * @param value the given JavaScript value
     */
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class JSONConversionsToJson[T <: js.Any](val value: T) extends AnyVal {
     @inline
     def toJson: String = js.JSON.stringify(value)
@@ -23,11 +25,13 @@ object JSONHelper {
     * JSON Conversions
     * @param text the given text string
     */
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class JSONConversionFromJson(val text: String) extends AnyVal {
     @inline
     def fromJson[T <: js.Any]: T = js.JSON.parse(text).asInstanceOf[T]
   }
 
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class ScalaJsJSONEnrichment(val json: js.JSON.type) extends AnyVal {
     @inline
     def parseAs[T](text: String): T =

core/src/main/scala/io/scalajs/util/ScalaJsHelper.scala

@@ -5,14 +5,17 @@ import scala.scalajs.js
 /**
   * ScalaJS Convenience Helper Functions
   */
+@deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
 object ScalaJsHelper {
   ////////////////////////////////////////////////////////////////////////
   //    Convenience Functions
   ////////////////////////////////////////////////////////////////////////
 
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   @inline
   def die[T](message: String): T = throw new IllegalStateException(message)
 
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   @inline
   def isDefined(obj: js.Any): Boolean = obj != null && !js.isUndefined(obj)
 
@@ -24,6 +27,7 @@ object ScalaJsHelper {
     * js.Dynamic to Value Extensions
     * @param obj the given [[js.Dynamic object]]
     */
+  @deprecated("Unrelated to Node.js. Use your own extension method.", "v0.10.0")
   implicit final class JsAnyExtensions(val obj: js.Any) extends AnyVal {
     @inline
     def asUndefOr[T]: js.UndefOr[T] = obj.asInstanceOf[js.UndefOr[T]]