Add empty declarations check matching TypeScript semantics

Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

Author: Copilot

internal/ls/findallreferences.go

@@ -592,7 +592,12 @@ func (l *LanguageService) ProvideSymbolsAndEntries(ctx context.Context, uri lspr
 		symbol := checker.GetSymbolAtLocation(core.IfElse(node.Kind == ast.KindConstructor && node.Parent.Name() != nil, node.Parent.Name(), node))
 		done()
 		if symbol != nil {
+			// Only allow a symbol to be renamed if it actually has at least one declaration.
 			declarations := symbol.Declarations
+			if len(declarations) == 0 {
+				return node, nil, false
+			}
+
 			// Disallow rename for elements that are defined in the standard TypeScript library.
 			if core.Some(declarations, func(declaration *ast.Node) bool {
 				return isDefinedInLibraryFile(program, declaration)

testdata/baselines/reference/submodule/fourslash/findRenameLocations/jsdocTypedefTagRename01.baseline.jsonc

@@ -29,5 +29,5 @@
 // 
 // NumberLike = 10;
 // 
-// /** @type {/*RENAME*/[|NumberLikeRENAME|]} */
+// /** @type {/*RENAME*/NumberLike} */
 // var numberLike;

testdata/baselines/reference/submodule/fourslash/findRenameLocations/jsdocTypedefTagRename01.baseline.jsonc.diff

@@ -37,10 +37,13 @@
 -// 
  // /** @typedef {(string | number)} */
 -// var [|NumberLikeRENAME|];
-+// var NumberLike;
- // 
+-// 
 -// [|NumberLikeRENAME|] = 10;
+-// 
+-// /** @type {/*RENAME*/[|NumberLikeRENAME|]} */
++// var NumberLike;
++// 
 +// NumberLike = 10;
- // 
- // /** @type {/*RENAME*/[|NumberLikeRENAME|]} */
++// 
++// /** @type {/*RENAME*/NumberLike} */
  // var numberLike;