make sure that enum values are computed before the emit

src/compiler/checker.ts

@@ -10001,8 +10001,8 @@ module ts {
             if (symbol && (symbol.flags & SymbolFlags.EnumMember)) {
                 var declaration = symbol.valueDeclaration;
                 var constantValue: number;
-                if (declaration.kind === SyntaxKind.EnumMember && (constantValue = getNodeLinks(declaration).enumMemberValue) !== undefined) {
-                    return constantValue;
+                if (declaration.kind === SyntaxKind.EnumMember) {
+                    return getEnumMemberValue(<EnumMember>declaration);
                 }
             }
 

src/harness/fourslash.ts

@@ -548,6 +548,18 @@ module FourSlash {
             }
         }
 
+        public verifyGetEmitOutputForCurrentFile(expected: string): void {
+            var emit = this.languageService.getEmitOutput(this.activeFile.fileName);
+            if (emit.outputFiles.length !== 1) {
+                throw new Error("Expected exactly one output from emit of " + this.activeFile.fileName);
+            }
+            this.taoInvalidReason = 'verifyGetEmitOutputForCurrentFile impossible';
+            var actual = emit.outputFiles[0].text;
+            if (actual !== expected) {
+                this.raiseError("Expected emit output to be '" + expected + "', but got '" + actual + "'");
+            }
+        }
+
         public verifyMemberListContains(symbol: string, text?: string, documentation?: string, kind?: string) {
             this.scenarioActions.push('<ShowCompletionList />');
             this.scenarioActions.push('<VerifyCompletionContainsItem ItemName="' + symbol + '"/>');

tests/cases/fourslash/constEnumsEmitOutputInMultipleFiles.ts

@@ -0,0 +1,18 @@
+/// <reference path='fourslash.ts'/>
+
+// @Filename: a.ts
+////const enum TestEnum {   
+////    Foo, Bar
+////}
+////var testFirstFile = TestEnum.Bar;
+
+// @Filename: b.ts
+/////// <reference path="a.ts" />
+/////*1*/
+////var testInOtherFile = TestEnum.Bar;
+
+goTo.marker("1");
+verify.verifyGetEmitOutputForCurrentFile(
+"/// <reference path=\"a.ts\" />\r\n\
+var testInOtherFile = 1 /* Bar */;\r\n"
+    )

tests/cases/fourslash/fourslash.ts

@@ -264,6 +264,10 @@ module FourSlashInterface {
             FourSlash.currentTestState.verifyCurrentFileContent(text);
         }
 
+        public verifyGetEmitOutputForCurrentFile(expected: string): void {
+            FourSlash.currentTestState.verifyGetEmitOutputForCurrentFile(expected);
+        }
+
         public currentParameterHelpArgumentNameIs(name: string) {
             FourSlash.currentTestState.verifyCurrentParameterHelpName(name);
         }