fix(10019): allow renaming labels (microsoft#40064)

Author: a-tarasyuk

src/services/rename.ts

@@ -13,7 +13,13 @@ namespace ts.Rename {
 
     function getRenameInfoForNode(node: Node, typeChecker: TypeChecker, sourceFile: SourceFile, isDefinedInLibraryFile: (declaration: Node) => boolean, options?: RenameInfoOptions): RenameInfo | undefined {
         const symbol = typeChecker.getSymbolAtLocation(node);
-        if (!symbol) return;
+        if (!symbol) {
+            if (isLabelName(node)) {
+                const name = getTextOfNode(node);
+                return getRenameInfoSuccess(name, name, ScriptElementKind.label, ScriptElementKindModifier.none, node, sourceFile);
+            }
+            return undefined;
+        }
         // Only allow a symbol to be renamed if it actually has at least one declaration.
         const { declarations } = symbol;
         if (!declarations || declarations.length === 0) return;

tests/baselines/reference/renameLabel1.baseline

@@ -0,0 +1,5 @@
+/*====== /tests/cases/fourslash/renameLabel1.ts ======*/
+
+RENAME: {
+    break [|RENAME|];
+}

tests/baselines/reference/renameLabel2.baseline

@@ -0,0 +1,5 @@
+/*====== /tests/cases/fourslash/renameLabel2.ts ======*/
+
+[|RENAME|]: {
+    break RENAME;
+}

tests/baselines/reference/renameLabel3.baseline

@@ -0,0 +1,8 @@
+/*====== /tests/cases/fourslash/renameLabel3.ts ======*/
+
+[|RENAME|]:
+for (let i = 0; i <= 10; i++) {
+   if (i === 0) continue RENAME;
+   if (i === 1) continue RENAME;
+   if (i === 10) break RENAME;
+}

tests/baselines/reference/renameLabel4.baseline

@@ -0,0 +1,8 @@
+/*====== /tests/cases/fourslash/renameLabel4.ts ======*/
+
+RENAME:
+for (let i = 0; i <= 10; i++) {
+   if (i === 0) continue RENAME;
+   if (i === 1) continue [|RENAME|];
+   if (i === 10) break RENAME;
+}

tests/baselines/reference/renameLabel5.baseline

@@ -0,0 +1,8 @@
+/*====== /tests/cases/fourslash/renameLabel5.ts ======*/
+
+RENAME: for (let i = 0; i <= 10; i++) {
+    loop2: for (let j = 0; j <= 10; j++) {
+        if (i === 5) continue [|RENAME|];
+        if (j === 5) break loop2;
+    }
+}

tests/baselines/reference/renameLabel6.baseline

@@ -0,0 +1,8 @@
+/*====== /tests/cases/fourslash/renameLabel6.ts ======*/
+
+loop1: for (let i = 0; i <= 10; i++) {
+    RENAME: for (let j = 0; j <= 10; j++) {
+        if (i === 5) continue loop1;
+        if (j === 5) break [|RENAME|];
+    }
+}

tests/cases/fourslash/renameLabel1.ts

@@ -0,0 +1,7 @@
+/// <reference path="fourslash.ts" />
+
+////foo: {
+////    break /**/foo;
+////}
+
+verify.baselineRename("", {});

tests/cases/fourslash/renameLabel2.ts

@@ -0,0 +1,7 @@
+/// <reference path="fourslash.ts" />
+
+/////**/foo: {
+////    break foo;
+////}
+
+verify.baselineRename("", {});

tests/cases/fourslash/renameLabel3.ts

@@ -0,0 +1,11 @@
+/// <reference path="fourslash.ts" />
+
+/////**/loop:
+////for (let i = 0; i <= 10; i++) {
+////   if (i === 0) continue loop;
+////   if (i === 1) continue loop;
+////   if (i === 10) break loop;
+////}
+
+verify.baselineRename("", {});
+

tests/cases/fourslash/renameLabel4.ts

@@ -0,0 +1,11 @@
+/// <reference path="fourslash.ts" />
+
+////loop:
+////for (let i = 0; i <= 10; i++) {
+////   if (i === 0) continue loop;
+////   if (i === 1) continue /**/loop;
+////   if (i === 10) break loop;
+////}
+
+verify.baselineRename("", {});
+

tests/cases/fourslash/renameLabel5.ts

@@ -0,0 +1,10 @@
+/// <reference path="fourslash.ts" />
+
+////loop1: for (let i = 0; i <= 10; i++) {
+////    loop2: for (let j = 0; j <= 10; j++) {
+////        if (i === 5) continue /**/loop1;
+////        if (j === 5) break loop2;
+////    }
+////}
+
+verify.baselineRename("", {});

tests/cases/fourslash/renameLabel6.ts

@@ -0,0 +1,10 @@
+/// <reference path="fourslash.ts" />
+
+////loop1: for (let i = 0; i <= 10; i++) {
+////    loop2: for (let j = 0; j <= 10; j++) {
+////        if (i === 5) continue loop1;
+////        if (j === 5) break /**/loop2;
+////    }
+////}
+
+verify.baselineRename("", {});