JS: prevent compiler from importing module more than once if not necessary. See KT-15260

js/js.translator/testData/box/jsModule/importCountCommonJS.js

@@ -0,0 +1,12 @@
+__beginModule__();
+module.exports = function(param) {
+    switch (typeof param) {
+        case "number":
+            return "a";
+        case "string":
+            return "b";
+        default:
+            return "c";
+    }
+};
+__endModule__("lib");

js/js.translator/testData/box/jsModule/importCountCommonJS.kt

@@ -0,0 +1,17 @@
+// MODULE_KIND: COMMON_JS
+// FUNCTION_CALLED_TIMES: require count=2
+
+@JsModule("lib")
+external fun f(x: Int): String
+
+@JsModule("lib")
+external fun f(x: String): String
+
+@JsModule("lib")
+external fun g(x: Boolean): String
+
+fun box(): String {
+    val result = f(23) + f("foo") + g(true)
+    if (result != "abc") return "fail: $result"
+    return "OK"
+}

js/js.translator/testData/box/jsModule/importCountUmd.js

@@ -0,0 +1,11 @@
+var f = function(param) {
+    switch (typeof param) {
+        case "number":
+            return "a";
+        case "string":
+            return "b";
+        default:
+            return "c";
+    }
+};
+var g = f;

js/js.translator/testData/box/jsModule/importCountUmd.kt

@@ -0,0 +1,21 @@
+// MODULE_KIND: UMD
+// NO_JS_MODULE_SYSTEM
+// FUNCTION_CALLED_TIMES: require count=3
+
+@JsModule("lib")
+@JsNonModule
+external fun f(x: Int): String
+
+@JsModule("lib")
+@JsNonModule
+external fun f(x: String): String
+
+@JsModule("lib")
+@JsNonModule
+external fun g(x: Boolean): String
+
+fun box(): String {
+    val result = f(23) + f("foo") + g(true)
+    if (result != "abc") return "fail: $result"
+    return "OK"
+}