Merge pull request #34524 from orta/fix_32675

Does not add a duplicate completion when offering an export which was re-declared as a global

src/services/completions.ts

@@ -1000,6 +1000,7 @@ namespace ts.Completions {
         let completionKind = CompletionKind.None;
         let isNewIdentifierLocation = false;
         let keywordFilters = KeywordCompletionFilters.None;
+        // This also gets mutated in nested-functions after the return
         let symbols: Symbol[] = [];
         const symbolToOriginInfoMap: SymbolOriginInfoMap = [];
         const symbolToSortTextMap: SymbolSortTextMap = [];
@@ -1464,7 +1465,7 @@ namespace ts.Completions {
         }
 
         /**
-         * Gathers symbols that can be imported from other files, deduplicating along the way. Symbols can be “duplicates”
+         * Gathers symbols that can be imported from other files, de-duplicating along the way. Symbols can be "duplicates"
          * if re-exported from another module, e.g. `export { foo } from "./a"`. That syntax creates a fresh symbol, but
          * it’s just an alias to the first, and both have the same name, so we generally want to filter those aliases out,
          * if and only if the the first can be imported (it may be excluded due to package.json filtering in
@@ -1548,7 +1549,7 @@ namespace ts.Completions {
                 // Don't add another completion for `export =` of a symbol that's already global.
                 // So in `declare namespace foo {} declare module "foo" { export = foo; }`, there will just be the global completion for `foo`.
                 if (resolvedModuleSymbol !== moduleSymbol &&
-                    every(resolvedModuleSymbol.declarations, d => !!d.getSourceFile().externalModuleIndicator)) {
+                    every(resolvedModuleSymbol.declarations, d => !!d.getSourceFile().externalModuleIndicator && !findAncestor(d, isGlobalScopeAugmentation))) {
                     pushSymbol(resolvedModuleSymbol, moduleSymbol, /*skipFilter*/ true);
                 }
 

tests/cases/fourslash/completionsRedeclareModuleAsGlobal.ts

@@ -0,0 +1,35 @@
+/// <reference path="fourslash.ts" />
+
+// 32675 - if this fails there are two copies of assert in completions
+
+// @esModuleInterop: true,
+// @target: esnext
+
+// @Filename: /myAssert.d.ts
+////declare function assert(value:any, message?:string):void;
+////export = assert;
+////export as namespace assert;
+
+// @Filename: /ambient.d.ts
+////import assert from './myAssert';
+////
+////type Assert = typeof assert;
+////
+////declare global {
+////  const assert: Assert;
+////}
+
+// @Filename: /index.ts
+/////// <reference path="./ambient.d.ts" />
+////asser/**/;
+
+verify.completions({
+  marker: "",
+  includes: [
+    {
+      name: "assert",
+      sortText: completion.SortText.GlobalsOrKeywords
+    }
+  ],
+  preferences: { includeCompletionsForModuleExports: true, includeInsertTextCompletions: true }
+});