String literal rename support

src/services/findAllReferences.ts

@@ -11,7 +11,7 @@ namespace ts.FindAllReferences {
         | { readonly type: DefinitionKind.Label; readonly node: Identifier }
         | { readonly type: DefinitionKind.Keyword; readonly node: Node }
         | { readonly type: DefinitionKind.This; readonly node: Node }
-        | { readonly type: DefinitionKind.String; readonly node: StringLiteral };
+        | { readonly type: DefinitionKind.String; readonly node: StringLiteralLike };
 
     export const enum EntryKind { Span, Node, StringLiteral, SearchedLocalFoundProperty, SearchedPropertyFoundLocal }
     export type NodeEntryKind = EntryKind.Node | EntryKind.StringLiteral | EntryKind.SearchedLocalFoundProperty | EntryKind.SearchedPropertyFoundLocal;
@@ -621,7 +621,7 @@ namespace ts.FindAllReferences {
             // Could not find a symbol e.g. unknown identifier
             if (!symbol) {
                 // String literal might be a property (and thus have a symbol), so do this here rather than in getReferencedSymbolsSpecial.
-                return !options.implementations && isStringLiteral(node) ? getReferencesForStringLiteral(node, sourceFiles, cancellationToken) : undefined;
+                return !options.implementations && isStringLiteralLike(node) ? getReferencesForStringLiteral(node, sourceFiles, checker, cancellationToken) : undefined;
             }
 
             if (symbol.escapedName === InternalSymbolName.ExportEquals) {
@@ -1889,11 +1889,23 @@ namespace ts.FindAllReferences {
             }];
         }
 
-        function getReferencesForStringLiteral(node: StringLiteral, sourceFiles: readonly SourceFile[], cancellationToken: CancellationToken): SymbolAndEntries[] {
+        function getReferencesForStringLiteral(node: StringLiteralLike, sourceFiles: readonly SourceFile[], checker: TypeChecker, cancellationToken: CancellationToken): SymbolAndEntries[] {
+            const type = getContextualTypeOrAncestorTypeNodeType(node, checker);
             const references = flatMap(sourceFiles, sourceFile => {
                 cancellationToken.throwIfCancellationRequested();
-                return mapDefined(getPossibleSymbolReferenceNodes(sourceFile, node.text), ref =>
-                    isStringLiteral(ref) && ref.text === node.text ? nodeEntry(ref, EntryKind.StringLiteral) : undefined);
+                return mapDefined(getPossibleSymbolReferenceNodes(sourceFile, node.text), ref => {
+                    if (isStringLiteralLike(ref) && ref.text === node.text) {
+                        if (type) {
+                            const refType = getContextualTypeOrAncestorTypeNodeType(ref, checker);
+                            if (type !== checker.getStringType() && type === refType) {
+                                return nodeEntry(ref, EntryKind.StringLiteral);
+                            }
+                        }
+                        else {
+                            return nodeEntry(ref, EntryKind.StringLiteral);
+                        }
+                    }
+                });
             });
 
             return [{

src/services/rename.ts

@@ -14,7 +14,15 @@ 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) {
-            if (isLabelName(node)) {
+            if (isStringLiteralLike(node)) {
+                const type = getContextualTypeOrAncestorTypeNodeType(node, typeChecker);
+                if (type && ((type.flags & TypeFlags.StringLiteral) || (
+                    (type.flags & TypeFlags.Union) && every((type as UnionType).types, type => !!(type.flags & TypeFlags.StringLiteral))
+                ))) {
+                    return getRenameInfoSuccess(node.text, node.text, ScriptElementKind.string, "", node, sourceFile);
+                }
+            }
+            else if (isLabelName(node)) {
                 const name = getTextOfNode(node);
                 return getRenameInfoSuccess(name, name, ScriptElementKind.label, ScriptElementKindModifier.none, node, sourceFile);
             }

src/services/utilities.ts

@@ -774,6 +774,27 @@ namespace ts {
         }
     }
 
+    function getAncestorTypeNode(node: Node) {
+        let lastTypeNode: TypeNode | undefined;
+        findAncestor(node, a => {
+            if (isTypeNode(a)) {
+                lastTypeNode = a;
+            }
+            return !isQualifiedName(a.parent) && !isTypeNode(a.parent) && !isTypeElement(a.parent);
+        });
+        return lastTypeNode;
+    }
+
+    export function getContextualTypeOrAncestorTypeNodeType(node: Expression, checker: TypeChecker) {
+        const contextualType = checker.getContextualType(node);
+        if (contextualType) {
+            return contextualType;
+        }
+
+        const ancestorTypeNode = getAncestorTypeNode(node);
+        return ancestorTypeNode && checker.getTypeAtLocation(ancestorTypeNode);
+    }
+
     function getAdjustedLocationForDeclaration(node: Node, forRename: boolean) {
         if (!forRename) {
             switch (node.kind) {

tests/cases/fourslash/renameStringLiteralOk.ts

@@ -0,0 +1,11 @@
+/// <reference path='fourslash.ts'/>
+
+//// interface Foo {
+////     f: '[|foo|]' | 'bar'
+//// }
+//// const d: 'foo' = 'foo'
+//// declare const f: Foo
+//// f.f = '[|foo|]'
+//// f.f = `[|foo|]`
+
+verify.rangesWithSameTextAreRenameLocations("foo");

tests/cases/fourslash/renameStringLiteralOk1.ts

@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts'/>
+
+//// declare function f(): '[|foo|]' | 'bar'
+//// class Foo {
+////     f = f()
+//// }
+//// const d: 'foo' = 'foo'
+//// declare const ff: Foo
+//// ff.f = '[|foo|]'
+
+verify.rangesWithSameTextAreRenameLocations("foo");
+
+interface Foo {
+    f: 'foo' | 'bar'
+}
+const d: 'foo' = 'foo'
+declare const f: Foo
+f.f = 'foo'

tests/cases/fourslash/renameStringLiteralTypes.ts

@@ -11,4 +11,4 @@
 ////
 ////animate({ deltaX: 100, deltaY: 100, easing: "[|ease-in-out|]" });
 
-goTo.eachRange(() => { verify.renameInfoFailed(); });
+verify.rangesWithSameTextAreRenameLocations("ease-in-out");