1 files changed, 66 insertions, 0 deletions
diff --git a/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/jsdep/JSDependency.scala b/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/jsdep/JSDependency.scala
new file mode 100644
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--- /dev/null
+++ b/examples/scala-js/tools/shared/src/main/scala/scala/scalajs/tools/jsdep/JSDependency.scala
@@ -0,0 +1,66 @@
+package scala.scalajs.tools.jsdep
+
+import scala.scalajs.tools.json._
+
+import scala.scalajs.ir.Trees.isValidIdentifier
+
+/** Expresses a dependency on a raw JS library and the JS libraries this library
+ *  itself depends on.
+ *
+ *  Both the [[resourceName]] and each element of [[dependencies]] is the
+ *  unqualified filename of the library (e.g. "jquery.js").
+ *
+ *  @param resourceName Filename of the JavaScript file to include
+ *      (e.g. "jquery.js")
+ *  @param dependencies Filenames of JavaScript files that must be included
+ *      before this JavaScript file.
+ *  @param commonJSName A JavaScript variable name this dependency should be
+ *      required in a commonJS environment (n.b. Node.js). Should only be set if
+ *      the JavaScript library will register its exports.
+ */
+final class JSDependency(
+    val resourceName: String,
+    val dependencies: List[String] = Nil,
+    val commonJSName: Option[String] = None) {
+
+  require(commonJSName.forall(isValidIdentifier),
+    "commonJSName must be a valid JavaScript identifier")
+
+  def dependsOn(names: String*): JSDependency =
+    copy(dependencies = dependencies ++ names)
+  def commonJSName(name: String): JSDependency =
+    copy(commonJSName = Some(name))
+  def withOrigin(origin: Origin): FlatJSDependency =
+    new FlatJSDependency(origin, resourceName, dependencies, commonJSName)
+
+  private def copy(
+      resourceName: String = this.resourceName,
+      dependencies: List[String] = this.dependencies,
+      commonJSName: Option[String] = this.commonJSName) = {
+    new JSDependency(resourceName, dependencies, commonJSName)
+  }
+}
+
+object JSDependency {
+
+  implicit object JSDepJSONSerializer extends JSONSerializer[JSDependency] {
+    def serialize(x: JSDependency): JSON = {
+      new JSONObjBuilder()
+        .fld("resourceName", x.resourceName)
+        .opt("dependencies",
+            if (x.dependencies.nonEmpty) Some(x.dependencies) else None)
+        .opt("commonJSName", x.commonJSName)
+        .toJSON
+    }
+  }
+
+  implicit object JSDepJSONDeserializer extends JSONDeserializer[JSDependency] {
+    def deserialize(x: JSON): JSDependency = {
+      val obj = new JSONObjExtractor(x)
+      new JSDependency(
+          obj.fld[String]      ("resourceName"),
+          obj.opt[List[String]]("dependencies").getOrElse(Nil),
+          obj.opt[String]      ("commonJSName"))
+    }
+  }
+}