JS: decomposition of "if"

js/js.inliner/src/org/jetbrains/kotlin/js/inline/ExpressionDecomposer.kt

@@ -314,7 +314,12 @@ private open class JsExpressionVisitor() : JsVisitorWithContextImpl() {
     // where init and test do not contain inline calls.
     override fun visit(x: JsFor, ctx: JsContext<*>): Boolean = false
 
-    override fun visit(x: JsIf, ctx: JsContext<*>): Boolean = false
+    override fun visit(x: JsIf, ctx: JsContext<*>): Boolean {
+        val test = x.getIfExpression()
+        x.setIfExpression(accept(test))
+        return false
+    }
+
     override fun visit(x: JsWhile, ctx: JsContext<*>): Boolean = false
     override fun visit(x: JsDoWhile, ctx: JsContext<*>): Boolean = false
 

js/js.translator/testData/inlineEvaluationOrder/cases/if.kt

@@ -0,0 +1,23 @@
+package foo
+
+fun test(x: Boolean, y: Boolean): Boolean {
+    if (fizz(x) && buzz(y)) {
+        return true
+    }
+
+    return false
+}
+
+
+fun box(): String {
+    assertEquals(false, test(false, true))
+    assertEquals("fizz(false);", pullLog())
+
+    assertEquals(false, test(true, false))
+    assertEquals("fizz(true);buzz(false);", pullLog())
+
+    assertEquals(true, test(true, true))
+    assertEquals("fizz(true);buzz(true);", pullLog())
+
+    return "OK"
+}