diff --git a/lib/file.js b/lib/file.js
deleted file mode 100644
index f3c6f32c8d29..000000000000
--- a/lib/file.js
+++ /dev/null
@@ -1,27 +0,0 @@
-type BabelFileModulesMetadata = {
-  imports: Array<Object>,
-  exports: {
-    exported: Array<Object>,
-    specifiers: Array<Object>
-  }
-};
-
-type BabelFileMetadata = {
-  usedHelpers: Array<string>;
-
-  marked: Array<{
-    type: string;
-    message: string;
-    loc: Object;
-  }>;
-
-  modules: BabelFileModulesMetadata
-};
-
-type BabelFileResult = {
-  ast?: ?Object;
-  code?: ?string;
-  map?: ?Object;
-  ignored?: ?boolean;
-  metadata?: ?BabelFileMetadata;
-};
diff --git a/lib/parser.js b/lib/parser.js
deleted file mode 100644
index 7c796731cea0..000000000000
--- a/lib/parser.js
+++ /dev/null
@@ -1,5 +0,0 @@
-type BabelParserOptions = {
-  sourceFilename?: string;
-  sourceType?: "module" | "script";
-  plugins?: Array<Object>;
-};
diff --git a/packages/babel-generator/src/index.ts b/packages/babel-generator/src/index.ts
index 326c8df96b99..7f8defd37e75 100644
--- a/packages/babel-generator/src/index.ts
+++ b/packages/babel-generator/src/index.ts
@@ -64,7 +64,6 @@ function normalizeOptions(
     indent: {
       adjustMultilineComment: true,
       style: "  ",
-      base: 0,
     },
     jsescOption: {
       quotes: "double",
diff --git a/packages/babel-generator/src/printer.ts b/packages/babel-generator/src/printer.ts
index d67fc5f69b18..5c4b5e3cc9ae 100644
--- a/packages/babel-generator/src/printer.ts
+++ b/packages/babel-generator/src/printer.ts
@@ -32,7 +32,6 @@ export type Format = {
   indent: {
     adjustMultilineComment: boolean;
     style: string;
-    base: number;
   };
   recordAndTupleSyntaxType: RecordAndTuplePluginOptions["syntaxType"];
   jsescOption: jsescOptions;