Add codemod command for removing unused imports

libcst/codemod/commands/remove_unused_imports.py

@@ -0,0 +1,22 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+#
+# pyre-strict
+
+from libcst import Import, ImportFrom
+from libcst.codemod import VisitorBasedCodemodCommand
+from libcst.codemod.visitors import RemoveImportsVisitor
+
+
+class RemoveUnusedImportsCommand(VisitorBasedCodemodCommand):
+    DESCRIPTION: str = "Remove all imports that are not used in a file."
+
+    def visit_Import(self, node: Import) -> bool:
+        RemoveImportsVisitor.remove_unused_import_by_node(self.context, node)
+        return False
+
+    def visit_ImportFrom(self, node: ImportFrom) -> bool:
+        RemoveImportsVisitor.remove_unused_import_by_node(self.context, node)
+        return False