JS: refactor flat declaration generator. Add more tests on inter-module dependencies

js/js.translator/testData/box/crossModuleRef/constructor.kt

@@ -0,0 +1,70 @@
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+class A(val x: Int) {
+    constructor(a: Int, b: Int) : this(a + b)
+}
+
+@native class B(x: Int) {
+    constructor(a: Int, b: Int) : this(0) {}
+
+    val x: Int
+}
+
+// TODO: may be useful after implementing local classes in inline functions
+/*
+inline fun foo(p: Int, q: Int, r: Int): Pair<Int, Int> {
+    class C(val x : Int) {
+        constructor(a: Int, b: Int) : this(a + b)
+    }
+    return Pair(C(p).x, C(q, r).x)
+}
+*/
+
+inline fun callPrimaryConstructor(x: Int) = A(x).x
+
+inline fun callSecondaryConstructor(x: Int, y: Int) = A(x, y).x
+
+// FILE: lib.js
+
+function B(x, y) {
+    this.x = x;
+    if (typeof y !== 'undefined') {
+        this.x += y;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(23).x
+    if (a != 23) return "fail: primary constructor: $a"
+
+    val b = A(40, 2).x
+    if (b != 42) return "fail: secondary constructor: $b"
+
+    val c = B(99).x
+    if (c != 99) return "fail: native primary constructor: $c"
+
+    val d = B(100, 11).x
+    if (d != 111) return "fail: native secondary constructor: $d"
+
+    /*
+    val (e, f) = foo(123, 320, 1)
+    if (e != 123) return "fail: local primary constructor: $e"
+    if (f != 321) return "fail: local secondary constructor: $f"
+    */
+
+    val g = callPrimaryConstructor(55)
+    if (g != 55) return "fail: primary constructor from inline function: $g"
+
+    val h = callSecondaryConstructor(990, 9)
+    if (h != 999) return "fail: secondary constructor from inline function: $h"
+
+    return "OK"
+}