Stop re-creating list of entry names

Author: sandersn

src/services/completions.ts

@@ -539,23 +539,25 @@ namespace ts.Completions {
         );
 
         if (keywordFilters !== KeywordCompletionFilters.None) {
-            const entryNames = new Set(entries.map(e => e.name));
             for (const keywordEntry of getKeywordCompletions(keywordFilters, !insideJsDocTagTypeExpression && isSourceFileJS(sourceFile))) {
-                if (isTypeOnlyLocation && isTypeKeyword(stringToToken(keywordEntry.name)!) || !entryNames.has(keywordEntry.name)) {
+                if (isTypeOnlyLocation && isTypeKeyword(stringToToken(keywordEntry.name)!) || !uniqueNames.has(keywordEntry.name)) {
+                    uniqueNames.add(keywordEntry.name)
                     insertSorted(entries, keywordEntry, compareCompletionEntries, /*allowDuplicates*/ true);
                 }
             }
         }
 
-        const entryNames = new Set(entries.map(e => e.name));
         for (const keywordEntry of getContextualKeywords(contextToken, position)) {
-            if (!entryNames.has(keywordEntry.name)) {
+            if (!uniqueNames.has(keywordEntry.name)) {
+                uniqueNames.add(keywordEntry.name)
                 insertSorted(entries, keywordEntry, compareCompletionEntries, /*allowDuplicates*/ true);
             }
         }
 
         for (const literal of literals) {
-            insertSorted(entries, createCompletionEntryForLiteral(sourceFile, preferences, literal), compareCompletionEntries, /*allowDuplicates*/ true);
+            const literalEntry = createCompletionEntryForLiteral(sourceFile, preferences, literal);
+            uniqueNames.add(literalEntry.name)
+            insertSorted(entries, literalEntry, compareCompletionEntries, /*allowDuplicates*/ true);
         }
 
         if (!isChecked) {