[JS IR] Add a compiler option for generating name entries in sourcemaps

js/js.frontend/src/org/jetbrains/kotlin/js/config/JSConfigurationKeys.java

@@ -38,6 +38,9 @@ public class JSConfigurationKeys {
     public static final CompilerConfigurationKey<SourceMapSourceEmbedding> SOURCE_MAP_EMBED_SOURCES =
             CompilerConfigurationKey.create("embed source files into source map");
 
+    public static final CompilerConfigurationKey<SourceMapNamesPolicy> SOURCEMAP_NAMES_POLICY = CompilerConfigurationKey.create(
+            "a policy to generate a mapping from generated identifiers to their corresponding original names");
+
     public static final CompilerConfigurationKey<Boolean> META_INFO =
             CompilerConfigurationKey.create("generate .meta.js and .kjsm files");
 

js/js.frontend/src/org/jetbrains/kotlin/js/config/SourceMapNamesPolicy.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.js.config
+
+/**
+ * A policy to generate name mappings in sourcemaps.
+ *
+ * Sourcemaps can map names from the generated JavaScript code to the names of the corresponding entities in the Kotlin source code.
+ */
+enum class SourceMapNamesPolicy {
+    /**
+     * Don't generate name mappings
+     */
+    NO,
+
+    /**
+     * Generate name mappings. For functions and methods, map to their simple names instead of fully-qualified names.
+     *
+     * This is the default.
+     */
+    SIMPLE_NAMES,
+
+    /**
+     * Generate name mappings. For functions and methods, map to their fully-qualified names.
+     */
+    FULLY_QUALIFIED_NAMES,
+}