accept baseline

Author: Kingwl

src/compiler/binder.ts

@@ -388,12 +388,14 @@ namespace ts {
                             message = Diagnostics.Enum_declarations_can_only_merge_with_namespace_or_other_enum_declarations;
                         }
 
-                        if (symbol.declarations && symbol.declarations.length) {
+                        let multipleDefaultExports = false;
+                        if (length(symbol.declarations)) {
                             // If the current node is a default export of some sort, then check if
                             // there are any other default exports that we need to error on.
                             // We'll know whether we have other default exports depending on if `symbol` already has a declaration list set.
                             if (isDefaultExport) {
                                 message = Diagnostics.A_module_cannot_have_multiple_default_exports;
+                                multipleDefaultExports = true;
                             }
                             else {
                                 // This is to properly report an error in the case "export default { }" is after export default of class declaration or function declaration.
@@ -403,6 +405,7 @@ namespace ts {
                                 if (symbol.declarations && symbol.declarations.length &&
                                     (node.kind === SyntaxKind.ExportAssignment && !(<ExportAssignment>node).isExportEquals)) {
                                     message = Diagnostics.A_module_cannot_have_multiple_default_exports;
+                                    multipleDefaultExports = true;
                                 }
                             }
                         }
@@ -413,7 +416,7 @@ namespace ts {
                         const declarationName = getNameOfDeclaration(node) || node;
                         const diag = createDiagnosticForNode(declarationName, message, getDisplayName(node))
                         file.bindDiagnostics.push(
-                            isDefaultExport ? addRelatedInfo( diag, createDiagnosticForNode(declarationName, Diagnostics.This_export_conflicts_with_the_first)) : diag
+                            multipleDefaultExports ? addRelatedInfo(diag, createDiagnosticForNode(declarationName, Diagnostics.This_export_conflicts_with_the_first)) : diag
                         );
 
                         symbol = createSymbol(SymbolFlags.None, name);

tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -5432,6 +5432,7 @@ declare namespace ts {
         Cannot_find_lib_definition_for_0_Did_you_mean_1: DiagnosticMessage;
         _0_was_declared_here: DiagnosticMessage;
         Property_0_is_used_before_its_initialization: DiagnosticMessage;
+        This_export_conflicts_with_the_first: DiagnosticMessage;
         Import_declaration_0_is_using_private_name_1: DiagnosticMessage;
         Type_parameter_0_of_exported_class_has_or_is_using_private_name_1: DiagnosticMessage;
         Type_parameter_0_of_exported_interface_has_or_is_using_private_name_1: DiagnosticMessage;
@@ -7399,6 +7400,7 @@ declare namespace ts {
     type Mutable<T extends object> = {
         -readonly [K in keyof T]: T[K];
     };
+    function addRelatedInfo<T extends Diagnostic>(diagnostic: T, ...relatedInformation: DiagnosticRelatedInformation[]): T;
 }
 declare namespace ts {
     function createNode(kind: SyntaxKind, pos?: number, end?: number): Node;

tests/baselines/reference/exportDefaultAlias_excludesEverything.errors.txt

@@ -10,4 +10,5 @@ tests/cases/compiler/exportDefaultAlias_excludesEverything.ts(3,16): error TS252
     export default B;
                    ~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/compiler/exportDefaultAlias_excludesEverything.ts:3:16: This export conflicts with the first.
 

tests/baselines/reference/jsFileCompilationBindMultipleDefaultExports.errors.txt

@@ -15,6 +15,7 @@ tests/cases/compiler/a.js(3,20): error TS2652: Merged declaration 'a' cannot inc
     export default var a = 10;
 
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/compiler/a.js:3:15: This export conflicts with the first.
                    ~~~
 !!! error TS1109: Expression expected.
                        ~

tests/baselines/reference/multipleDefaultExports01.errors.txt

@@ -7,6 +7,7 @@ tests/cases/conformance/es6/modules/m1.ts(10,16): error TS2528: A module cannot
     export default class foo {
                          ~~~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/es6/modules/m1.ts:1:22: This export conflicts with the first.
 
     }
 
@@ -20,6 +21,7 @@ tests/cases/conformance/es6/modules/m1.ts(10,16): error TS2528: A module cannot
     export default x;
                    ~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/es6/modules/m1.ts:10:16: This export conflicts with the first.
 
 ==== tests/cases/conformance/es6/modules/m2.ts (0 errors) ====
     import Entity from "./m1"

tests/baselines/reference/multipleDefaultExports03.errors.txt

@@ -11,4 +11,5 @@ tests/cases/conformance/es6/modules/multipleDefaultExports03.ts(4,22): error TS2
     export default class C {
                          ~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/es6/modules/multipleDefaultExports03.ts:4:22: This export conflicts with the first.
     }

tests/baselines/reference/multipleExportDefault1.errors.txt

@@ -16,4 +16,5 @@ tests/cases/conformance/externalModules/multipleExportDefault1.ts(5,1): error TS
     };
     ~~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/externalModules/multipleExportDefault1.ts:5:1: This export conflicts with the first.
 

tests/baselines/reference/multipleExportDefault2.errors.txt

@@ -10,6 +10,7 @@ tests/cases/conformance/externalModules/multipleExportDefault2.ts(5,25): error T
     };
     ~~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/externalModules/multipleExportDefault2.ts:1:1: This export conflicts with the first.
 
     export default function Foo() { }
                             ~~~

tests/baselines/reference/multipleExportDefault3.errors.txt

@@ -14,5 +14,6 @@ tests/cases/conformance/externalModules/multipleExportDefault3.ts(5,22): error T
     export default class C { }
                          ~
 !!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/externalModules/multipleExportDefault3.ts:5:22: This export conflicts with the first.
 
 

tests/baselines/reference/multipleExportDefault4.errors.txt

@@ -13,4 +13,5 @@ tests/cases/conformance/externalModules/multipleExportDefault4.ts(3,1): error TS
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     };
     ~~
-!!! error TS2528: A module cannot have multiple default exports.
+!!! error TS2528: A module cannot have multiple default exports.
+!!! related TS2730 tests/cases/conformance/externalModules/multipleExportDefault4.ts:3:1: This export conflicts with the first.