Fixed find all references for private identifiers. (microsoft#35887)

Author: dragomirtitian

src/compiler/utilities.ts

@@ -2625,7 +2625,6 @@ namespace ts {
             case SyntaxKind.NumericLiteral:
                 if (isComputedPropertyName(parent)) return parent.parent;
                 // falls through
-
             case SyntaxKind.Identifier:
                 if (isDeclaration(parent)) {
                     return parent.name === name ? parent : undefined;
@@ -2643,6 +2642,8 @@ namespace ts {
                         ? binExp
                         : undefined;
                 }
+            case SyntaxKind.PrivateIdentifier:
+                return isDeclaration(parent) && parent.name === name ? parent : undefined;
             default:
                 return undefined;
         }

src/services/findAllReferences.ts

@@ -925,7 +925,7 @@ namespace ts.FindAllReferences {
                 // The other two forms seem to be handled downstream (e.g. in `skipPastExportOrImportSpecifier`), so special-casing the first form
                 // here appears to be intentional).
                 const {
-                    text = stripQuotes(unescapeLeadingUnderscores((getLocalSymbolForExportDefault(symbol) || getNonModuleSymbolOfMergedModuleSymbol(symbol) || symbol).escapedName)),
+                    text = stripQuotes(symbolName(getLocalSymbolForExportDefault(symbol) || getNonModuleSymbolOfMergedModuleSymbol(symbol) || symbol)),
                     allSearchSymbols = [symbol],
                 } = searchOptions;
                 const escapedText = escapeLeadingUnderscores(text);
@@ -1087,7 +1087,7 @@ namespace ts.FindAllReferences {
 
             // If this is private property or method, the scope is the containing class
             if (flags & (SymbolFlags.Property | SymbolFlags.Method)) {
-                const privateDeclaration = find(declarations, d => hasModifier(d, ModifierFlags.Private));
+                const privateDeclaration = find(declarations, d => hasModifier(d, ModifierFlags.Private) || isPrivateIdentifierPropertyDeclaration(d));
                 if (privateDeclaration) {
                     return getAncestor(privateDeclaration, SyntaxKind.ClassDeclaration);
                 }
@@ -1231,9 +1231,9 @@ namespace ts.FindAllReferences {
         function isValidReferencePosition(node: Node, searchSymbolName: string): boolean {
             // Compare the length so we filter out strict superstrings of the symbol we are looking for
             switch (node.kind) {
+                case SyntaxKind.PrivateIdentifier:
                 case SyntaxKind.Identifier:
-                    return (node as Identifier).text.length === searchSymbolName.length;
-
+                    return (node as PrivateIdentifier | Identifier).text.length === searchSymbolName.length;
                 case SyntaxKind.NoSubstitutionTemplateLiteral:
                 case SyntaxKind.StringLiteral: {
                     const str = node as StringLiteralLike;

src/services/utilities.ts

@@ -721,7 +721,7 @@ namespace ts {
      * position >= start and (position < end or (position === end && token is literal or keyword or identifier))
      */
     export function getTouchingPropertyName(sourceFile: SourceFile, position: number): Node {
-        return getTouchingToken(sourceFile, position, n => isPropertyNameLiteral(n) || isKeyword(n.kind));
+        return getTouchingToken(sourceFile, position, n => isPropertyNameLiteral(n) || isKeyword(n.kind) || isPrivateIdentifier(n));
     }
 
     /**

tests/cases/fourslash/findAllRefsPrivateNameProperties.ts

@@ -0,0 +1,24 @@
+/// <reference path='fourslash.ts'/>
+
+////class C {
+////    [|[|{|"isDefinition": true, "isWriteAccess": true, "contextRangeIndex": 0 |}#foo|] = 10;|]
+////    constructor() {
+////        this.[|{|"isWriteAccess": true|}#foo|] = 20;
+////    }
+////}
+////class D extends C {
+////    constructor() {
+////        super()
+////        this.#foo = 20;
+////    }
+////}
+////class E {
+////    [|[|{|"isDefinition": true, "contextRangeIndex": 3 |}#foo|]: number;|]
+////    constructor() {
+////        this.[|{|"isWriteAccess": true|}#foo|] = 20;
+////    }
+////}
+
+const [rC0Def, rC0, rC1, rE0Def, rE0, rE1] = test.ranges();
+verify.singleReferenceGroup("(property) C.#foo: number", [rC0, rC1]);
+verify.singleReferenceGroup("(property) E.#foo: number", [rE0, rE1]);