Remove uses of null in services

src/services/formatting/ruleOperation.ts

@@ -1,16 +1,9 @@
 ///<reference path='references.ts' />
-/* tslint:disable:no-null-keyword */
 
 /* @internal */
 namespace ts.formatting {
     export class RuleOperation {
-        public Context: RuleOperationContext;
-        public Action: RuleAction;
-
-        constructor() {
-            this.Context = null;
-            this.Action = null;
-        }
+        constructor(public Context: RuleOperationContext, public Action: RuleAction) {}
 
         public toString(): string {
             return "[context=" + this.Context + "," +
@@ -22,10 +15,7 @@ namespace ts.formatting {
         }
 
         static create2(context: RuleOperationContext, action: RuleAction) {
-            const result = new RuleOperation();
-            result.Context = context;
-            result.Action = action;
-            return result;
+            return new RuleOperation(context, action);
         }
     }
 }

src/services/formatting/rulesMap.ts

@@ -1,5 +1,4 @@
 ///<reference path='references.ts' />
-/* tslint:disable:no-null-keyword */
 
 /* @internal */
 namespace ts.formatting {
@@ -62,14 +61,14 @@ namespace ts.formatting {
         public GetRule(context: FormattingContext): Rule {
             const bucketIndex = this.GetRuleBucketIndex(context.currentTokenSpan.kind, context.nextTokenSpan.kind);
             const bucket = this.map[bucketIndex];
-            if (bucket != null) {
+            if (bucket) {
                 for (const rule of bucket.Rules()) {
                     if (rule.Operation.Context.InContext(context)) {
                         return rule;
                     }
                 }
             }
-            return null;
+            return undefined;
         }
     }
 

src/services/formatting/rulesProvider.ts

@@ -1,5 +1,4 @@
 /// <reference path="references.ts"/>
-/* tslint:disable:no-null-keyword */
 
 /* @internal */
 namespace ts.formatting {
@@ -26,8 +25,7 @@ namespace ts.formatting {
         }
 
         public ensureUpToDate(options: ts.FormatCodeOptions) {
-            // TODO: Should this be '==='?
-            if (this.options == null || !ts.compareDataObjects(this.options, options)) {
+            if (!this.options || !ts.compareDataObjects(this.options, options)) {
                 const activeRules = this.createActiveRules(options);
                 const rulesMap = RulesMap.create(activeRules);