From dfba3e22f73307f76676ee1f10be9448f9e93d35 Mon Sep 17 00:00:00 2001
From: "Yang, Bo" <pop.atry@gmail.com>
Date: Wed, 25 Dec 2019 00:46:00 +0000
Subject: [PATCH] Workaround for breaking API changes in sbt-scalajs 1.x

---
 travis/build.sbt                              |  6 +-
 .../travis/TravisScalaJs.scala                | 57 ++++++++++++++++---
 2 files changed, 54 insertions(+), 9 deletions(-)

diff --git a/travis/build.sbt b/travis/build.sbt
index f82bb13..e918305 100644
--- a/travis/build.sbt
+++ b/travis/build.sbt
@@ -2,7 +2,11 @@ libraryDependencies += "com.jsuereth" %% "scala-arm" % "2.0"
 
 addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.4.2")
 
-addSbtPlugin("org.scala-js" % "sbt-scalajs" % "0.6.31")
+libraryDependencies += Defaults.sbtPluginExtra(
+  "org.scala-js" % "sbt-scalajs" % "1.0.0-RC2",
+  (sbtBinaryVersion in pluginCrossBuild).value,
+  (scalaBinaryVersion in update).value
+) % Optional
 
 libraryDependencies += "org.yaml" % "snakeyaml" % "1.25"
 
diff --git a/travis/src/main/scala/com/thoughtworks/sbtBestPractice/travis/TravisScalaJs.scala b/travis/src/main/scala/com/thoughtworks/sbtBestPractice/travis/TravisScalaJs.scala
index 89e6224..b0c33a3 100644
--- a/travis/src/main/scala/com/thoughtworks/sbtBestPractice/travis/TravisScalaJs.scala
+++ b/travis/src/main/scala/com/thoughtworks/sbtBestPractice/travis/TravisScalaJs.scala
@@ -1,21 +1,62 @@
 package com.thoughtworks.sbtBestPractice.travis
 
-import sbt.{AutoPlugin, Def}
+import sbt._
 import org.scalajs.sbtplugin.ScalaJSPlugin
-import org.scalajs.sbtplugin.ScalaJSPlugin.autoImport._
+import scala.language.reflectiveCalls
 
 /**
   * @author 杨博 (Yang Bo)
   */
 object TravisScalaJs extends AutoPlugin {
+  private def reflectiveLinkerSetting[
+      StandardConfig <: {
+        def withBatchMode(batchMode: Boolean): StandardConfig
+      }
+  ](key: SettingKey[StandardConfig]): Def.Setting[StandardConfig] = {
+    key := {
+      key.value.withBatchMode(Travis.travisRepoSlug.?.value.isDefined)
+    }
+  }
+
+  private def scalaJSLinkerConfig06[
+      StandardConfig <: {
+        def withBatchMode(batchMode: Boolean): StandardConfig
+      }
+  ] = {
+    // The type of ScalaJSPlugin v0.6
+    type ScalaJSPlugin06 = {
+      def autoImport: {
+        def scalaJSLinkerConfig: SettingKey[StandardConfig]
+      }
+    }
+    ScalaJSPlugin.asInstanceOf[ScalaJSPlugin06].autoImport.scalaJSLinkerConfig
+  }
 
-  override def requires = Travis && ScalaJSPlugin
+  override def projectSettings: Seq[Def.Setting[_]] = {
+    Seq(try {
+      // sbt-scalajs 1.x
+      reflectiveLinkerSetting(ScalaJSPlugin.autoImport.scalaJSLinkerConfig)
+    } catch {
+      case _: NoClassDefFoundError =>
+        // sbt-scalajs 0.6.x
+        reflectiveLinkerSetting(scalaJSLinkerConfig06)
+    })
+  }
 
-  override def projectSettings: Seq[Def.Setting[_]] = Seq(
-    scalaJSLinkerConfig := {
-      scalaJSLinkerConfig.value.withBatchMode(Travis.travisRepoSlug.?.value.isDefined)
+  override def requires = {
+    try {
+      ScalaJSPlugin && Travis
+    } catch {
+      case _: NoClassDefFoundError =>
+        Travis
     }
-  )
-  override def trigger = allRequirements
+  }
 
+  override def trigger = {
+    if (requires == Travis) {
+      noTrigger
+    } else {
+      allRequirements
+    }
+  }
 }