Address PR: Remove duplication

Author: Kanchalai Tanglertsampan

src/compiler/types.ts

@@ -1,4 +1,4 @@
-namespace ts {
+namespace ts {
     /**
      * Type of objects whose values are all of the same type.
      * The `in` and `for-in` operators can *not* be safely used,
@@ -1451,10 +1451,6 @@ namespace ts {
         expression: SuperExpression;
     }
 
-    export interface ImportExpression extends PrimaryExpression {
-        kind: SyntaxKind.ImportKeyword;
-    }
-
     export interface ImportCall extends CallExpression {
         expression: ImportExpression;
     }