Fix issue 12218 and linter error

Author: DanCorder

src/compiler/moduleNameResolver.ts

@@ -322,7 +322,7 @@ namespace ts {
         if (traceEnabled) {
             trace(host, Diagnostics.Resolving_module_0_from_1, moduleName, containingFile);
         }
-        let perFolderCache = cache && cache.getOrCreateCacheForDirectory(getDirectoryPath(containingFile));
+        const perFolderCache = cache && cache.getOrCreateCacheForDirectory(getDirectoryPath(containingFile));
         let result = perFolderCache && perFolderCache[moduleName];
 
         if (result) {

src/services/formatting/rules.ts

@@ -358,7 +358,7 @@ namespace ts.formatting {
             this.NoSpaceAfterModuleImport = new Rule(RuleDescriptor.create2(Shared.TokenRange.FromTokens([SyntaxKind.ModuleKeyword, SyntaxKind.RequireKeyword]), SyntaxKind.OpenParenToken), RuleOperation.create2(new RuleOperationContext(Rules.IsNonJsxSameLineTokenContext), RuleAction.Delete));
 
             // Add a space around certain TypeScript keywords
-            this.SpaceAfterCertainTypeScriptKeywords = new Rule(RuleDescriptor.create4(Shared.TokenRange.FromTokens([SyntaxKind.AbstractKeyword, SyntaxKind.ClassKeyword, SyntaxKind.DeclareKeyword, SyntaxKind.DefaultKeyword, SyntaxKind.EnumKeyword, SyntaxKind.ExportKeyword, SyntaxKind.ExtendsKeyword, SyntaxKind.GetKeyword, SyntaxKind.ImplementsKeyword, SyntaxKind.ImportKeyword, SyntaxKind.InterfaceKeyword, SyntaxKind.ModuleKeyword, SyntaxKind.NamespaceKeyword, SyntaxKind.PrivateKeyword, SyntaxKind.PublicKeyword, SyntaxKind.ProtectedKeyword, SyntaxKind.SetKeyword, SyntaxKind.StaticKeyword, SyntaxKind.TypeKeyword, SyntaxKind.FromKeyword]), Shared.TokenRange.Any), RuleOperation.create2(new RuleOperationContext(Rules.IsNonJsxSameLineTokenContext), RuleAction.Space));
+            this.SpaceAfterCertainTypeScriptKeywords = new Rule(RuleDescriptor.create4(Shared.TokenRange.FromTokens([SyntaxKind.AbstractKeyword, SyntaxKind.ClassKeyword, SyntaxKind.DeclareKeyword, SyntaxKind.DefaultKeyword, SyntaxKind.EnumKeyword, SyntaxKind.ExportKeyword, SyntaxKind.ExtendsKeyword, SyntaxKind.GetKeyword, SyntaxKind.ImplementsKeyword, SyntaxKind.ImportKeyword, SyntaxKind.InterfaceKeyword, SyntaxKind.ModuleKeyword, SyntaxKind.NamespaceKeyword, SyntaxKind.PrivateKeyword, SyntaxKind.PublicKeyword, SyntaxKind.ProtectedKeyword, SyntaxKind.ReadonlyKeyword, SyntaxKind.SetKeyword, SyntaxKind.StaticKeyword, SyntaxKind.TypeKeyword, SyntaxKind.FromKeyword]), Shared.TokenRange.Any), RuleOperation.create2(new RuleOperationContext(Rules.IsNonJsxSameLineTokenContext), RuleAction.Space));
             this.SpaceBeforeCertainTypeScriptKeywords = new Rule(RuleDescriptor.create4(Shared.TokenRange.Any, Shared.TokenRange.FromTokens([SyntaxKind.ExtendsKeyword, SyntaxKind.ImplementsKeyword, SyntaxKind.FromKeyword])), RuleOperation.create2(new RuleOperationContext(Rules.IsNonJsxSameLineTokenContext), RuleAction.Space));
 
             // Treat string literals in module names as identifiers, and add a space between the literal and the opening Brace braces, e.g.: module "m2" {

tests/cases/fourslash/formattingReadonly.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts' />
+
+////class C {
+////  readonly    property1 {};/*1*/
+////  public readonly   property2 {};/*2*/
+////}
+
+format.document();
+goTo.marker("1");
+verify.currentLineContentIs("    readonly property1 {};");
+goTo.marker("2");
+verify.currentLineContentIs("    public readonly property2 {};");