diff --git a/.gitignore b/.gitignore
index 36c5645..2f7896d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,17 +1 @@
-/.settings/
-/.idea/
 target/
-*.log
-*.iml
-/\.target/
-/\.cache
-/\.project
-/\.classpath
-.history
-.DS_Store
-/tmp/
-/bin/
-/.cache-main
-/.cache-tests
-admin/.coursier
-admin/.scalafmt*
diff --git a/build.sbt b/build.sbt
new file mode 100644
index 0000000..2dddf96
--- /dev/null
+++ b/build.sbt
@@ -0,0 +1,11 @@
+lazy val root = project.in(file("."))
+  .settings(ScalaModulePlugin.scalaModuleSettings)
+  .settings(
+    name    := "scala-library-next",
+    scalacOptions ++= Seq("-deprecation", "-feature", "-Werror"),
+    scalaModuleMimaPreviousVersion := None,
+    libraryDependencies ++= Seq(
+      "junit" % "junit" % "4.13.1" % Test,
+      "org.scalacheck" %% "scalacheck" % "1.14.3" % Test,
+    )
+  )
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..bd12a25
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+set -e
+
+# Builds of tagged revisions are published to sonatype staging.
+
+# Travis runs a build on new revisions and on new tags, so a tagged revision is built twice.
+# Builds for a tag have TRAVIS_TAG defined, which we use for identifying tagged builds.
+
+# sbt-dynver sets the version number from the tag
+# sbt-travisci sets the Scala version from the travis job matrix
+
+# To back-publish an existing release for a new Scala / Scala.js / Scala Native version:
+# - check out the tag for the version that needs to be published
+# - change `.travis.yml` to adjust the version numbers and trim down the build matrix as necessary
+# - commit the changes and tag this new revision with an arbitrary suffix after a hash, e.g.,
+#   `v1.2.3#dotty-0.27` (the suffix is ignored, the version will be `1.2.3`)
+
+isReleaseJob() {
+  if [[ "$ADOPTOPENJDK" == "8" ]]; then
+    true
+  else
+    false
+  fi
+}
+
+if [[ "$SCALAJS_VERSION" == "" ]]; then
+  projectPrefix=""
+else
+  projectPrefix="TODO/"
+fi
+
+verPat="[0-9]+\.[0-9]+\.[0-9]+(-[A-Za-z0-9-]+)?"
+tagPat="^v$verPat(#.*)?$"
+
+if [[ "$TRAVIS_TAG" =~ $tagPat ]]; then
+  releaseTask="ci-release"
+  if ! isReleaseJob; then
+    echo "Not releasing on Java $ADOPTOPENJDK with Scala $TRAVIS_SCALA_VERSION"
+    exit 0
+  fi
+fi
+
+# default is +publishSigned; we cross-build with travis jobs, not sbt's crossScalaVersions
+export CI_RELEASE="${projectPrefix}publishSigned"
+export CI_SNAPSHOT_RELEASE="${projectPrefix}publish"
+
+# default is sonatypeBundleRelease, which closes and releases the staging repo
+# see https://github.com/xerial/sbt-sonatype#commands
+# for now, until we're confident in the new release scripts, just close the staging repo.
+export CI_SONATYPE_RELEASE="; sonatypePrepare; sonatypeBundleUpload; sonatypeClose"
+
+sbt clean ${projectPrefix}test ${projectPrefix}publishLocal $releaseTask
diff --git a/project/build.properties b/project/build.properties
new file mode 100644
index 0000000..08e4d79
--- /dev/null
+++ b/project/build.properties
@@ -0,0 +1 @@
+sbt.version=1.4.1
diff --git a/project/plugins.sbt b/project/plugins.sbt
new file mode 100644
index 0000000..81fac90
--- /dev/null
+++ b/project/plugins.sbt
@@ -0,0 +1 @@
+addSbtPlugin("org.scala-lang.modules" % "sbt-scala-module" % "2.2.3")
diff --git a/src/main/scala/scala/SampleAddition.scala b/src/main/scala/scala/SampleAddition.scala
new file mode 100644
index 0000000..d038538
--- /dev/null
+++ b/src/main/scala/scala/SampleAddition.scala
@@ -0,0 +1,15 @@
+/*
+ * Scala (https://www.scala-lang.org)
+ *
+ * Copyright EPFL and Lightbend, Inc.
+ *
+ * Licensed under Apache License 2.0
+ * (http://www.apache.org/licenses/LICENSE-2.0).
+ *
+ * See the NOTICE file distributed with this work for
+ * additional information regarding copyright ownership.
+ */
+
+package scala
+
+object SampleAddition