[Wasm] Fix external functions import clashing

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/ir2wasm/DeclarationGenerator.kt

@@ -54,7 +54,10 @@ class DeclarationGenerator(
     }
 
     private fun jsCodeName(declaration: IrFunction): String {
-        return declaration.fqNameWhenAvailable!!.asString() + "_" + (declaration as IrSimpleFunction).wasmSignature(irBuiltIns).hashCode()
+        require(declaration is IrSimpleFunction)
+        val fqName = declaration.fqNameWhenAvailable!!.asString()
+        val hashCode = declaration.wasmSignature(irBuiltIns).hashCode() + declaration.file.path.hashCode()
+        return "${fqName}_$hashCode"
     }
 
     override fun visitFunction(declaration: IrFunction) {

compiler/testData/codegen/boxWasmJsInterop/nameClash.kt

@@ -0,0 +1,21 @@
+// IGNORE_BACKEND: JS_IR, JS
+// FILE: file1.kt
+@JsFun("() => 42")
+private external fun clashName(): Int
+
+public fun getClashName1(): Int = clashName()
+
+// FILE: file2.kt
+@JsFun("() => 24")
+private external fun clashName(): Int
+
+public fun getClashName2(): Int = clashName()
+
+fun box(): String {
+
+    if (getClashName1() != 42) return "Error1"
+    if (getClashName2() != 24) return "Error2"
+
+
+    return "OK"
+}

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsCodegenWasmJsInteropTestGenerated.java

@@ -73,6 +73,12 @@ public class FirJsCodegenWasmJsInteropTestGenerated extends AbstractFirJsCodegen
         runTest("compiler/testData/codegen/boxWasmJsInterop/longStrings.kt");
     }
 
+    @Test
+    @TestMetadata("nameClash.kt")
+    public void testNameClash() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/nameClash.kt");
+    }
+
     @Test
     @TestMetadata("types.kt")
     public void testTypes() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrCodegenWasmJsInteropJsTestGenerated.java

@@ -73,6 +73,12 @@ public class IrCodegenWasmJsInteropJsTestGenerated extends AbstractIrCodegenWasm
         runTest("compiler/testData/codegen/boxWasmJsInterop/longStrings.kt");
     }
 
+    @Test
+    @TestMetadata("nameClash.kt")
+    public void testNameClash() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/nameClash.kt");
+    }
+
     @Test
     @TestMetadata("types.kt")
     public void testTypes() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/testOld/wasm/semantics/IrCodegenWasmJsInteropWasmTestGenerated.java

@@ -85,6 +85,11 @@ public class IrCodegenWasmJsInteropWasmTestGenerated extends AbstractIrCodegenWa
         runTest("compiler/testData/codegen/boxWasmJsInterop/longStrings.kt");
     }
 
+    @TestMetadata("nameClash.kt")
+    public void testNameClash() throws Exception {
+        runTest("compiler/testData/codegen/boxWasmJsInterop/nameClash.kt");
+    }
+
     @TestMetadata("nullableExternRefs.kt")
     public void testNullableExternRefs() throws Exception {
         runTest("compiler/testData/codegen/boxWasmJsInterop/nullableExternRefs.kt");