Remove TsIndexSignature from typescript::strip (#922)

ecmascript/transforms/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "swc_ecma_transforms"
-version = "0.17.1"
+version = "0.17.2"
 authors = ["강동윤 <kdy1997.dev@gmail.com>"]
 license = "Apache-2.0/MIT"
 repository = "https://github.com/swc-project/swc.git"

ecmascript/transforms/src/typescript.rs

@@ -781,6 +781,7 @@ impl Fold for Strip {
         let members = members.fold_children_with(self);
 
         members.move_flat_map(|member| match member {
+            ClassMember::TsIndexSignature(..) => None,
             ClassMember::Constructor(Constructor { body: None, .. }) => None,
             ClassMember::Method(ClassMethod {
                 is_abstract: true, ..

ecmascript/transforms/tests/typescript_strip.rs

@@ -671,3 +671,11 @@ to!(
     }
 }"#
 );
+
+to!(
+    issue_921,
+    "export abstract class Kernel {
+  [key: string]: any
+}",
+    "export abstract class Kernel {}"
+);