JS: cache metadata, grouped by package FQN

js/js.frontend/src/org/jetbrains/kotlin/incremental/js/IncrementalDataProvider.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.incremental.js
 
+import org.jetbrains.kotlin.name.FqName
 import java.io.File
 
 // byte arrays are used to simplify passing to different classloaders
@@ -27,10 +28,14 @@ interface IncrementalDataProvider {
     val compiledPackageParts: Map<File, TranslationResultValue>
 
     val metadataVersion: IntArray
+
+    /** gets non-dirty package metadata from previous compilation */
+    val packageMetadata: Map<String, ByteArray>
 }
 
 class IncrementalDataProviderImpl(
     override val headerMetadata: ByteArray,
     override val compiledPackageParts: Map<File, TranslationResultValue>,
-    override val metadataVersion: IntArray
+    override val metadataVersion: IntArray,
+    override val packageMetadata: Map<String, ByteArray>
 ) : IncrementalDataProvider

js/js.frontend/src/org/jetbrains/kotlin/incremental/js/IncrementalResultsConsumer.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.incremental.js
 
+import org.jetbrains.kotlin.name.FqName
 import java.io.File
 import java.io.Serializable
 import java.security.MessageDigest
@@ -39,6 +40,8 @@ interface IncrementalResultsConsumer {
      * Used in daemon RPC.
      */
     fun processInlineFunctions(functions: Collection<JsInlineFunctionHash>)
+
+    fun processPackageMetadata(packageName: String, metadata: ByteArray)
 }
 
 class JsInlineFunctionHash(val sourceFilePath: String, val fqName: String, val inlineFunctionMd5Hash: Long): Serializable
@@ -97,6 +100,14 @@ class IncrementalResultsConsumerImpl : IncrementalResultsConsumer {
         val mapForSource = _deferInlineFuncs.getOrPut(sourceFile) { hashMapOf() }
         mapForSource[fqName] = FunctionWithSourceInfo(inlineFunction, line, column)
     }
+
+    private val _packageMetadata = hashMapOf<String, ByteArray>()
+    val packageMetadata: Map<String, ByteArray>
+        get() = _packageMetadata
+
+    override fun processPackageMetadata(packageName: String, metadata: ByteArray) {
+        _packageMetadata[packageName] = metadata
+    }
 }
 
 private fun ByteArray.md5(): Long {