isDefaultExport is always false here.

TravCav · TravCav · commit 42d226ca4249 · 2018-04-05T10:38:51.000-04:00
diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
@@ -399,7 +399,7 @@ namespace ts {
                                 // 1. multiple export default of class declaration or function declaration by checking NodeFlags.Default
                                 // 2. multiple export default of export assignment. This one doesn't have NodeFlags.Default on (as export default doesn't considered as modifiers)
                                 if (symbol.declarations && symbol.declarations.length &&
-                                    (isDefaultExport || (node.kind === SyntaxKind.ExportAssignment && !(<ExportAssignment>node).isExportEquals))) {
+                                    (node.kind === SyntaxKind.ExportAssignment && !(<ExportAssignment>node).isExportEquals)) {
                                     message = Diagnostics.A_module_cannot_have_multiple_default_exports;
                                 }
                             }

Original file line number	Diff line number	Diff line change
`@@ -399,7 +399,7 @@ namespace ts {`
`399`	`399`	`// 1. multiple export default of class declaration or function declaration by checking NodeFlags.Default`
`400`	`400`	`// 2. multiple export default of export assignment. This one doesn't have NodeFlags.Default on (as export default doesn't considered as modifiers)`
`401`	`401`	`if (symbol.declarations && symbol.declarations.length &&`
`402`		`- (isDefaultExport \|\| (node.kind === SyntaxKind.ExportAssignment && !(<ExportAssignment>node).isExportEquals))) {`
	`402`	`+ (node.kind === SyntaxKind.ExportAssignment && !(<ExportAssignment>node).isExportEquals)) {`
`403`	`403`	`message = Diagnostics.A_module_cannot_have_multiple_default_exports;`
`404`	`404`	`}`
`405`	`405`	`}`