Don't show the currently-completing thing at the cursor in JS files

Fixes #6693

(cherry picked from commit 124bd51)

Author: RyanCavanaugh

src/services/services.ts

@@ -62,7 +62,7 @@ namespace ts {
     export interface SourceFile {
         /* @internal */ version: string;
         /* @internal */ scriptSnapshot: IScriptSnapshot;
-        /* @internal */ nameTable: Map<string>;
+        /* @internal */ nameTable: Map<number>;
 
         /* @internal */ getNamedDeclarations(): Map<Declaration[]>;
 
@@ -808,7 +808,7 @@ namespace ts {
         public languageVersion: ScriptTarget;
         public languageVariant: LanguageVariant;
         public identifiers: Map<string>;
-        public nameTable: Map<string>;
+        public nameTable: Map<number>;
         public resolvedModules: Map<ResolvedModule>;
         public imports: LiteralExpression[];
         public moduleAugmentations: LiteralExpression[];
@@ -1957,8 +1957,6 @@ namespace ts {
         const text = scriptSnapshot.getText(0, scriptSnapshot.getLength());
         const sourceFile = createSourceFile(fileName, text, scriptTarget, setNodeParents);
         setSourceFileFields(sourceFile, scriptSnapshot, version);
-        // after full parsing we can use table with interned strings as name table
-        sourceFile.nameTable = sourceFile.identifiers;
         return sourceFile;
     }
 
@@ -3834,7 +3832,7 @@ namespace ts {
 
             if (isRightOfDot && isSourceFileJavaScript(sourceFile)) {
                 const uniqueNames = getCompletionEntriesFromSymbols(symbols, entries);
-                addRange(entries, getJavaScriptCompletionEntries(sourceFile, uniqueNames));
+                addRange(entries, getJavaScriptCompletionEntries(sourceFile, location.pos, uniqueNames));
             }
             else {
                 if (!symbols || symbols.length === 0) {
@@ -3867,12 +3865,17 @@ namespace ts {
 
             return { isMemberCompletion, isNewIdentifierLocation, entries };
 
-            function getJavaScriptCompletionEntries(sourceFile: SourceFile, uniqueNames: Map<string>): CompletionEntry[] {
+            function getJavaScriptCompletionEntries(sourceFile: SourceFile, position: number, uniqueNames: Map<string>): CompletionEntry[] {
                 const entries: CompletionEntry[] = [];
                 const target = program.getCompilerOptions().target;
 
                 const nameTable = getNameTable(sourceFile);
                 for (const name in nameTable) {
+                    // Skip identifiers produced only from the current location
+                    if (nameTable[name] === position) {
+                        continue;
+                    }
+
                     if (!uniqueNames[name]) {
                         uniqueNames[name] = name;
                         const displayName = getCompletionEntryDisplayName(name, target, /*performCharacterChecks*/ true);
@@ -7525,7 +7528,7 @@ namespace ts {
     }
 
     /* @internal */
-    export function getNameTable(sourceFile: SourceFile): Map<string> {
+    export function getNameTable(sourceFile: SourceFile): Map<number> {
         if (!sourceFile.nameTable) {
             initializeNameTable(sourceFile);
         }
@@ -7534,15 +7537,15 @@ namespace ts {
     }
 
     function initializeNameTable(sourceFile: SourceFile): void {
-        const nameTable: Map<string> = {};
+        const nameTable: Map<number> = {};
 
         walk(sourceFile);
         sourceFile.nameTable = nameTable;
 
         function walk(node: Node) {
             switch (node.kind) {
                 case SyntaxKind.Identifier:
-                    nameTable[(<Identifier>node).text] = (<Identifier>node).text;
+                    nameTable[(<Identifier>node).text] = nameTable[(<Identifier>node).text] === undefined ? node.pos : -1;
                     break;
                 case SyntaxKind.StringLiteral:
                 case SyntaxKind.NumericLiteral:
@@ -7554,7 +7557,7 @@ namespace ts {
                         node.parent.kind === SyntaxKind.ExternalModuleReference ||
                         isArgumentOfElementAccessExpression(node)) {
 
-                        nameTable[(<LiteralExpression>node).text] = (<LiteralExpression>node).text;
+                        nameTable[(<LiteralExpression>node).text] = nameTable[(<LiteralExpression>node).text] === undefined ? node.pos : -1;
                     }
                     break;
                 default:

tests/cases/fourslash/getJavaScriptCompletions20.ts

@@ -0,0 +1,21 @@
+/// <reference path="fourslash.ts" />
+
+// @allowNonTsExtensions: true
+// @Filename: file.js
+//// /**
+////  * A person
+////  * @constructor
+////  * @param {string} name - The name of the person.
+////  * @param {number} age - The age of the person.
+////  */
+//// function Person(name, age) {
+////     this.name = name;
+////     this.age = age;
+//// }
+//// 
+//// 
+//// Person.getName = 10;
+//// Person.getNa/**/ = 10;
+
+goTo.marker();
+verify.not.memberListContains('getNa');