Add DSL to packageJson's exports

npm-publish-gradle-plugin/src/main/kotlin/extension/domain/json/Exports.kt

@@ -0,0 +1,69 @@
+package dev.petuska.npm.publish.extension.domain.json
+
+import org.gradle.api.provider.MapProperty
+import org.gradle.api.provider.Property
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.Optional
+
+/**
+ * [exports field](https://nodejs.org/api/packages.html#main-entry-point-export)
+ */
+public abstract class Exports : GenericJsonObject() {
+
+  internal abstract val paths: MapProperty<String, ExportedPath>
+
+  override fun finalise(): MutableMap<String, Any> = super.finalise().apply {
+    paths.get().forEach { (path, info) ->
+      put(path, info.finalise())
+    }
+  }
+}
+
+/**
+ * A path that will be exported in [Exports]
+ */
+public abstract class ExportedPath : GenericJsonObject() {
+
+  /**
+   * If set, this path will be set in "default"
+   */
+  @get:Input
+  @get:Optional
+  public abstract val default: Property<String>
+
+  /**
+   * If set, this path will be set in "types"
+   */
+  @get:Input
+  @get:Optional
+  public abstract val types: Property<String>
+
+  /**
+   * If set, this path will be set in "import"
+   */
+  @get:Input
+  @get:Optional
+  public abstract val import: Property<String>
+
+  /**
+   * If set, this path will be set in "require"
+   */
+  @get:Input
+  @get:Optional
+  public abstract val require: Property<String>
+
+  override fun finalise(): MutableMap<String, Any> = super.finalise().apply {
+    types.finalOrNull?.let {
+      put("types", it)
+    }
+    default.finalOrNull?.let {
+      put("default", it)
+    }
+    require.finalOrNull?.let {
+      put("require", it)
+    }
+    import.finalOrNull?.let {
+      put("import", it)
+    }
+  }
+}

npm-publish-gradle-plugin/src/main/kotlin/extension/domain/json/PackageJson.kt

@@ -1,5 +1,6 @@
 package dev.petuska.npm.publish.extension.domain.json
 
+import dev.petuska.npm.publish.util.configure
 import org.gradle.api.Action
 import org.gradle.api.provider.ListProperty
 import org.gradle.api.provider.Property
@@ -163,6 +164,13 @@ public abstract class PackageJson : GenericJsonObject() {
   @get:Optional
   public abstract val bundledDependencies: SetProperty<String>
 
+  /**
+   * [exports](https://docs.npmjs.com/files/package.json#bundleddependencies)
+   */
+  @get:Input
+  @get:Optional
+  public abstract val exports: Property<Exports>
+
   // region DSL
 
   /**
@@ -286,6 +294,45 @@ public abstract class PackageJson : GenericJsonObject() {
     optionalDependencies.configure(action)
   }
 
+  /**
+   * Set exports to a single path that will map "."
+   * @see [exports]
+   */
+  public infix fun Property<Exports>.by(path: String) {
+    configure({ exports ->
+      exports.paths.configure { paths ->
+        paths["."] = instance(ExportedPath::class).apply {
+          default.set(path)
+        }
+      }
+    })
+  }
+
+  /**
+   * Set exports to a single path that will map ".", this path may have several export
+   * @see [exports]
+   */
+  public infix fun Property<Exports>.by(pathAction: Action<ExportedPath>) {
+    this by mapOf("." to pathAction)
+  }
+
+  /**
+   * Configure exports to a map of configurable paths
+   * @see [exports]
+   */
+  public infix fun Property<Exports>.by(paths: Map<String, Action<ExportedPath>>) {
+    exports.set(
+      instance(Exports::class).also {
+        it.paths.putAll(
+          paths.mapValues { (_, action) -> ExportedPath(action) }
+        )
+      }
+    )
+  }
+
+  private fun ExportedPath(action: Action<ExportedPath>): ExportedPath =
+    instance(ExportedPath::class).apply(action::execute)
+
   // endregion
 
   @Suppress("ComplexMethod")
@@ -319,5 +366,6 @@ public abstract class PackageJson : GenericJsonObject() {
     peerDependencies.finalOrNull?.let { put("peerDependencies", it.finalise()) }
     optionalDependencies.finalOrNull?.let { put("optionalDependencies", it.finalise()) }
     bundledDependencies.final?.let { put("bundledDependencies", it) }
+    exports.finalOrNull?.let { put("exports", it) }
   }
 }

samples/local-ts-consumer/kt/build.gradle.kts

@@ -1,3 +1,5 @@
+import dev.petuska.npm.publish.extension.domain.json.ExportedPath
+
 plugins {
   kotlin("multiplatform")
   id("dev.petuska.npm.publish")
@@ -20,4 +22,11 @@ kotlin {
 
 npmPublish {
   organization.set("mpetuska")
+  packages {
+    named("js") {
+      packageJson {
+        exports by "index.mjs"
+      }
+    }
+  }
 }