fix missing export

Author: a-tarasyuk

internal/transformers/declarations/transform.go

@@ -1905,8 +1905,9 @@ func (tx *DeclarationTransformer) transformExpandoAssignment(node *ast.BinaryExp
 	modifierFlags := ast.ModifierFlagsAmbient
 	replacement := make([]*ast.Node, 0)
 
-	if ast.HasModifier(declaration, ast.ModifierFlagsExport) {
-		if ast.HasModifier(declaration, ast.ModifierFlagsDefault) {
+	flags := ast.GetCombinedModifierFlags(declaration)
+	if flags & ast.ModifierFlagsExport != 0 {
+		if flags & ast.ModifierFlagsDefault != 0 {
 			if n := tx.transformExpandoHost(name, declaration); n != nil {
 				replacement = append(replacement, n)
 			}

testdata/baselines/reference/submodule/compiler/declarationEmitExpandoWithGenericConstraint.js

@@ -41,7 +41,7 @@ export declare const Point: {
     zero: () => Point;
 };
 export declare const Rect: <p extends Point>(a: p, b: p) => Rect<p>;
-declare namespace Point {
+export declare namespace Point {
     const zero: () => Point;
 }
 
@@ -50,13 +50,11 @@ declare namespace Point {
 
 
 declarationEmitExpandoWithGenericConstraint.d.ts(1,18): error TS2451: Cannot redeclare block-scoped variable 'Point'.
-declarationEmitExpandoWithGenericConstraint.d.ts(9,22): error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
 declarationEmitExpandoWithGenericConstraint.d.ts(9,22): error TS2451: Cannot redeclare block-scoped variable 'Point'.
-declarationEmitExpandoWithGenericConstraint.d.ts(14,19): error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-declarationEmitExpandoWithGenericConstraint.d.ts(14,19): error TS2451: Cannot redeclare block-scoped variable 'Point'.
+declarationEmitExpandoWithGenericConstraint.d.ts(14,26): error TS2451: Cannot redeclare block-scoped variable 'Point'.
 
 
-==== declarationEmitExpandoWithGenericConstraint.d.ts (5 errors) ====
+==== declarationEmitExpandoWithGenericConstraint.d.ts (3 errors) ====
     export interface Point {
                      ~~~~~
 !!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
@@ -69,17 +67,13 @@ declarationEmitExpandoWithGenericConstraint.d.ts(14,19): error TS2451: Cannot re
     }
     export declare const Point: {
                          ~~~~~
-!!! error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-                         ~~~~~
 !!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
         (x: number, y: number): Point;
         zero: () => Point;
     };
     export declare const Rect: <p extends Point>(a: p, b: p) => Rect<p>;
-    declare namespace Point {
-                      ~~~~~
-!!! error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-                      ~~~~~
+    export declare namespace Point {
+                             ~~~~~
 !!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
         const zero: () => Point;
     }

testdata/baselines/reference/submodule/compiler/declarationEmitExpandoWithGenericConstraint.js.diff

@@ -8,7 +8,7 @@
 +    zero: () => Point;
  };
  export declare const Rect: <p extends Point>(a: p, b: p) => Rect<p>;
-+declare namespace Point {
++export declare namespace Point {
 +    const zero: () => Point;
 +}
 +
@@ -17,13 +17,11 @@
 +
 +
 +declarationEmitExpandoWithGenericConstraint.d.ts(1,18): error TS2451: Cannot redeclare block-scoped variable 'Point'.
-+declarationEmitExpandoWithGenericConstraint.d.ts(9,22): error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
 +declarationEmitExpandoWithGenericConstraint.d.ts(9,22): error TS2451: Cannot redeclare block-scoped variable 'Point'.
-+declarationEmitExpandoWithGenericConstraint.d.ts(14,19): error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-+declarationEmitExpandoWithGenericConstraint.d.ts(14,19): error TS2451: Cannot redeclare block-scoped variable 'Point'.
++declarationEmitExpandoWithGenericConstraint.d.ts(14,26): error TS2451: Cannot redeclare block-scoped variable 'Point'.
 +
 +
-+==== declarationEmitExpandoWithGenericConstraint.d.ts (5 errors) ====
++==== declarationEmitExpandoWithGenericConstraint.d.ts (3 errors) ====
 +    export interface Point {
 +                     ~~~~~
 +!!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
@@ -36,17 +34,13 @@
 +    }
 +    export declare const Point: {
 +                         ~~~~~
-+!!! error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-+                         ~~~~~
 +!!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
 +        (x: number, y: number): Point;
 +        zero: () => Point;
 +    };
 +    export declare const Rect: <p extends Point>(a: p, b: p) => Rect<p>;
-+    declare namespace Point {
-+                      ~~~~~
-+!!! error TS2395: Individual declarations in merged declaration 'Point' must be all exported or all local.
-+                      ~~~~~
++    export declare namespace Point {
++                             ~~~~~
 +!!! error TS2451: Cannot redeclare block-scoped variable 'Point'.
 +        const zero: () => Point;
 +    }