Handle generating action for export equals with anonymous symbol

Fixes microsoft#28845

Author: sheetalkamat

src/services/completions.ts

@@ -367,7 +367,9 @@ namespace ts.Completions {
     }
 
     function getSymbolName(symbol: Symbol, origin: SymbolOriginInfo | undefined, target: ScriptTarget): string {
-        return origin && originIsExport(origin) && origin.isDefaultExport && symbol.escapedName === InternalSymbolName.Default
+        return origin && originIsExport(origin) && (
+            (origin.isDefaultExport && symbol.escapedName === InternalSymbolName.Default) ||
+            (symbol.escapedName === InternalSymbolName.ExportEquals))
             // Name of "export default foo;" is "foo". Name of "export default 0" is the filename converted to camelCase.
             ? firstDefined(symbol.declarations, d => isExportAssignment(d) && isIdentifier(d.expression) ? d.expression.text : undefined)
                 || codefix.moduleSymbolToValidIdentifier(origin.moduleSymbol, target)

tests/cases/fourslash/completionsImport_exportEquals_anonymous.ts

@@ -0,0 +1,28 @@
+/// <reference path='fourslash.ts'/>
+
+// Use `/src` to test that directory names are not included in conversion from module path to identifier.
+// @noLib: true
+
+// @Filename: /src/foo-bar.ts
+////export = 0;
+
+// @Filename: /src/b.ts
+////exp/*0*/
+////fooB/*1*/
+
+goTo.marker("0");
+const preferences: FourSlashInterface.UserPreferences = { includeCompletionsForModuleExports: true };
+const exportEntry: FourSlashInterface.ExpectedCompletionEntryObject = { name: "fooBar", source: "/src/foo-bar", sourceDisplay: "./foo-bar", text: "(property) export=: 0", kind: "property", hasAction: true };
+verify.completions(
+    { marker: "0", exact: ["undefined", exportEntry, ...completion.statementKeywordsWithTypes], preferences },
+    { marker: "1", includes: exportEntry, preferences }
+);
+verify.applyCodeActionFromCompletion("0", {
+    name: "fooBar",
+    source: "/src/foo-bar",
+    description: `Import 'fooBar' from module "./foo-bar"`,
+    newFileContent: `import fooBar = require("./foo-bar");
+
+exp
+fooB`,
+});