added tests for import\export elision

tests/baselines/reference/separateCompilationImportExportElision.errors.txt

@@ -0,0 +1,28 @@
+tests/cases/compiler/separateCompilationImportExportElision.ts(2,17): error TS2307: Cannot find external module 'module'.
+tests/cases/compiler/separateCompilationImportExportElision.ts(3,18): error TS2307: Cannot find external module 'module'.
+tests/cases/compiler/separateCompilationImportExportElision.ts(4,21): error TS2307: Cannot find external module 'module'.
+tests/cases/compiler/separateCompilationImportExportElision.ts(12,18): error TS2307: Cannot find external module 'module'.
+
+
+==== tests/cases/compiler/separateCompilationImportExportElision.ts (4 errors) ====
+    
+    import {c} from "module"
+                    ~~~~~~~~
+!!! error TS2307: Cannot find external module 'module'.
+    import {c2} from "module"
+                     ~~~~~~~~
+!!! error TS2307: Cannot find external module 'module'.
+    import * as ns from "module"
+                        ~~~~~~~~
+!!! error TS2307: Cannot find external module 'module'.
+    
+    class C extends c2.C {
+    }
+    
+    let x = new c();
+    let y = ns.value;
+    
+    export {c1} from "module";
+                     ~~~~~~~~
+!!! error TS2307: Cannot find external module 'module'.
+    export var z = x;

tests/baselines/reference/separateCompilationImportExportElision.js

@@ -0,0 +1,37 @@
+//// [separateCompilationImportExportElision.ts]
+
+import {c} from "module"
+import {c2} from "module"
+import * as ns from "module"
+
+class C extends c2.C {
+}
+
+let x = new c();
+let y = ns.value;
+
+export {c1} from "module";
+export var z = x;
+
+//// [separateCompilationImportExportElision.js]
+var __extends = this.__extends || function (d, b) {
+    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    function __() { this.constructor = d; }
+    __.prototype = b.prototype;
+    d.prototype = new __();
+};
+var module_1 = require("module");
+var module_2 = require("module");
+var ns = require("module");
+var C = (function (_super) {
+    __extends(C, _super);
+    function C() {
+        _super.apply(this, arguments);
+    }
+    return C;
+})(module_2.c2.C);
+var x = new module_1.c();
+var y = ns.value;
+var module_3 = require("module");
+exports.c1 = module_3.c1;
+exports.z = x;

tests/cases/compiler/separateCompilationImportExportElision.ts

@@ -0,0 +1,17 @@
+// @separateCompilation: true
+// @target: es5
+// @module: commonjs
+
+// @filename: file1.ts
+import {c} from "module"
+import {c2} from "module"
+import * as ns from "module"
+
+class C extends c2.C {
+}
+
+let x = new c();
+let y = ns.value;
+
+export {c1} from "module";
+export var z = x;