Merge pull request #13446 from Microsoft/export_equals_completion

Include properties of an `export =` value in import completions.

src/compiler/checker.ts

@@ -108,6 +108,7 @@ namespace ts {
             getAliasedSymbol: resolveAlias,
             getEmitResolver,
             getExportsOfModule: getExportsOfModuleAsArray,
+            getExportsAndPropertiesOfModule,
             getAmbientModules,
             getJsxElementAttributesType,
             getJsxIntrinsicTagNames,
@@ -1527,6 +1528,15 @@ namespace ts {
             return symbolsToArray(getExportsOfModule(moduleSymbol));
         }
 
+        function getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[] {
+            const exports = getExportsOfModuleAsArray(moduleSymbol);
+            const exportEquals = resolveExternalModuleSymbol(moduleSymbol);
+            if (exportEquals !== moduleSymbol) {
+                addRange(exports, getPropertiesOfType(getTypeOfSymbol(exportEquals)));
+            }
+            return exports;
+        }
+
         function tryGetMemberInModuleExports(memberName: string, moduleSymbol: Symbol): Symbol | undefined {
             const symbolTable = getExportsOfModule(moduleSymbol);
             if (symbolTable) {

src/compiler/types.ts

@@ -2370,6 +2370,8 @@ namespace ts {
         isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName, propertyName: string): boolean;
         getAliasedSymbol(symbol: Symbol): Symbol;
         getExportsOfModule(moduleSymbol: Symbol): Symbol[];
+        /** Unlike `getExportsOfModule`, this includes properties of an `export =` value. */
+        /* @internal */ getExportsAndPropertiesOfModule(moduleSymbol: Symbol): Symbol[];
 
         getJsxElementAttributesType(elementNode: JsxOpeningLikeElement): Type;
         getJsxIntrinsicTagNames(): Symbol[];

src/harness/fourslash.ts

@@ -425,8 +425,7 @@ namespace FourSlash {
         }
 
         private raiseError(message: string) {
-            message = this.messageAtLastKnownMarker(message);
-            throw new Error(message);
+            throw new Error(this.messageAtLastKnownMarker(message));
         }
 
         private messageAtLastKnownMarker(message: string) {
@@ -723,6 +722,27 @@ namespace FourSlash {
             }
         }
 
+        public verifyCompletionsAt(markerName: string, expected: string[]) {
+            this.goToMarker(markerName);
+
+            const actualCompletions = this.getCompletionListAtCaret();
+            if (!actualCompletions) {
+                this.raiseError(`No completions at position '${this.currentCaretPosition}'.`);
+            }
+
+            const actual = actualCompletions.entries;
+
+            if (actual.length !== expected.length) {
+                this.raiseError(`Expected ${expected.length} completions, got ${actual.map(a => a.name)}.`);
+            }
+
+            ts.zipWith(actual, expected, (completion, expectedCompletion, index) => {
+                if (completion.name !== expectedCompletion) {
+                    this.raiseError(`Expected completion at index ${index} to be ${expectedCompletion}, got ${completion.name}`);
+                }
+            });
+        }
+
         public verifyCompletionListContains(symbol: string, text?: string, documentation?: string, kind?: string, spanIndex?: number) {
             const completions = this.getCompletionListAtCaret();
             if (completions) {
@@ -3166,6 +3186,10 @@ namespace FourSlashInterface {
             super(state);
         }
 
+        public completionsAt(markerName: string, completions: string[]) {
+            this.state.verifyCompletionsAt(markerName, completions);
+        }
+
         public quickInfoIs(expectedText: string, expectedDocumentation?: string) {
             this.state.verifyQuickInfoString(expectedText, expectedDocumentation);
         }

src/services/completions.ts

@@ -1318,14 +1318,14 @@ namespace ts.Completions {
             isMemberCompletion = true;
             isNewIdentifierLocation = false;
 
-            let exports: Symbol[];
-            const moduleSpecifierSymbol = typeChecker.getSymbolAtLocation(importOrExportDeclaration.moduleSpecifier);
-            if (moduleSpecifierSymbol) {
-                exports = typeChecker.getExportsOfModule(moduleSpecifierSymbol);
+            const moduleSpecifierSymbol = typeChecker.getSymbolAtLocation(moduleSpecifier);
+            if (!moduleSpecifierSymbol) {
+                symbols = emptyArray;
+                return true;
             }
 
-            symbols = exports ? filterNamedImportOrExportCompletionItems(exports, namedImportsOrExports.elements) : emptyArray;
-
+            const exports = typeChecker.getExportsAndPropertiesOfModule(moduleSpecifierSymbol);
+            symbols = filterNamedImportOrExportCompletionItems(exports, namedImportsOrExports.elements);
             return true;
         }
 

tests/cases/fourslash/completionListForExportEquals.ts

@@ -0,0 +1,16 @@
+
+///<reference path="fourslash.ts"/>
+
+// @Filename: /node_modules/foo/index.d.ts
+////export = Foo;
+////declare var Foo: Foo.Static;
+////declare namespace Foo {
+////    interface Static {
+////        foo(): void;
+////    }
+////}
+
+// @Filename: /a.ts
+////import { /**/ } from "foo";
+
+verify.completionsAt("", ["Static", "foo"]);

tests/cases/fourslash/completionListForExportEquals2.ts

@@ -0,0 +1,14 @@
+
+///<reference path="fourslash.ts"/>
+
+// @Filename: /node_modules/foo/index.d.ts
+////export = Foo;
+////interface Foo { bar: number; }
+////declare namespace Foo {
+////    interface Static {}
+////}
+
+// @Filename: /a.ts
+////import { /**/ } from "foo";
+
+verify.completionsAt("", ["Static"]);

tests/cases/fourslash/completionListInImportClause04.ts

@@ -11,10 +11,7 @@
 // @Filename: app.ts
 ////import {/*1*/} from './foo';
 
-goTo.marker('1');
-verify.completionListContains('prop1');
-verify.completionListContains('prop2');
-verify.not.completionListContains('Foo');
+verify.completionsAt("1", ["prototype", "prop1", "prop2"]);
 verify.numberOfErrorsInCurrentFile(0);
 goTo.marker('2');
 verify.numberOfErrorsInCurrentFile(0);

tests/cases/fourslash/fourslash.ts

@@ -138,6 +138,7 @@ declare namespace FourSlashInterface {
     class verify extends verifyNegatable {
         assertHasRanges(ranges: Range[]): void;
         caretAtMarker(markerName?: string): void;
+        completionsAt(markerName: string, completions: string[]): void;
         indentationIs(numberOfSpaces: number): void;
         indentationAtPositionIs(fileName: string, position: number, numberOfSpaces: number, indentStyle?: ts.IndentStyle, baseIndentSize?: number): void;
         textAtCaretIs(text: string): void;