fix completion module path (microsoft#19351)(microsoft#19367) (microsoft#19366)

* completion module path with re-export(microsoft#19351)

* completion module path with dynamic import(microsoft#19367)

Author: Kingwl

src/services/completions.ts

@@ -241,11 +241,15 @@ namespace ts.Completions {
             // a['/*completion position*/']
             return getStringLiteralCompletionEntriesFromElementAccess(node.parent, typeChecker, compilerOptions.target, log);
         }
-        else if (node.parent.kind === SyntaxKind.ImportDeclaration || isExpressionOfExternalModuleImportEqualsDeclaration(node) || isRequireCall(node.parent, /*checkArgumentIsStringLiteral*/ false)) {
+        else if (node.parent.kind === SyntaxKind.ImportDeclaration || node.parent.kind === SyntaxKind.ExportDeclaration
+            || isRequireCall(node.parent, /*checkArgumentIsStringLiteral*/ false) || isImportCall(node.parent)
+            || isExpressionOfExternalModuleImportEqualsDeclaration(node)) {
             // Get all known external module names or complete a path to a module
             // i.e. import * as ns from "/*completion position*/";
+            //      var y = import("/*completion position*/");
             //      import x = require("/*completion position*/");
             //      var y = require("/*completion position*/");
+            //      export * from "/*completion position*/";
             return PathCompletions.getStringLiteralCompletionEntriesFromModuleNames(<StringLiteral>node, compilerOptions, host, typeChecker);
         }
         else if (isEqualityExpression(node.parent)) {

tests/cases/fourslash/completionForStringLiteralExport.ts

@@ -0,0 +1,37 @@
+/// <reference path='fourslash.ts' />
+
+// Should define spans for replacement that appear after the last directory seperator in export statements
+
+// @typeRoots: my_typings
+
+// @Filename: test.ts
+//// export * from "./some/*0*/
+//// export * from "./sub/some/*1*/";
+//// export * from "some-/*2*/";
+//// export * from "..//*3*/";
+//// export {} from ".//*4*/";
+
+
+// @Filename: someFile1.ts
+//// /*someFile1*/
+
+// @Filename: sub/someFile2.ts
+//// /*someFile2*/
+
+// @Filename: my_typings/some-module/index.d.ts
+//// export var x = 9;
+
+goTo.marker("0");
+verify.completionListContains("someFile1");
+
+goTo.marker("1");
+verify.completionListContains("someFile2");
+
+goTo.marker("2");
+verify.completionListContains("some-module");
+
+goTo.marker("3");
+verify.completionListContains("fourslash");
+
+goTo.marker("4");
+verify.completionListContains("someFile1");

tests/cases/fourslash/completionForStringLiteralWithDynamicImport.ts

@@ -0,0 +1,33 @@
+/// <reference path='fourslash.ts' />
+
+// Should define spans for replacement that appear after the last directory seperator in dynamic import statements
+
+// @typeRoots: my_typings
+
+// @Filename: test.ts
+//// const a = import("./some/*0*/
+//// const a = import("./sub/some/*1*/");
+//// const a = import("some-/*2*/");
+//// const a = import("..//*3*/");
+
+
+// @Filename: someFile1.ts
+//// /*someFile1*/
+
+// @Filename: sub/someFile2.ts
+//// /*someFile2*/
+
+// @Filename: my_typings/some-module/index.d.ts
+//// export var x = 9;
+
+goTo.marker("0");
+verify.completionListContains("someFile1");
+
+goTo.marker("1");
+verify.completionListContains("someFile2");
+
+goTo.marker("2");
+verify.completionListContains("some-module");
+
+goTo.marker("3");
+verify.completionListContains("fourslash");