add lib folder

lib/file.js

@@ -0,0 +1,27 @@
+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;
+};

lib/parser.js

@@ -0,0 +1,10 @@
+type BabelParserOptions = {
+  strictMode?: boolean;
+  looseModules?: boolean;
+  highlightCode?: boolean;
+  nonStandard?: boolean;
+  sourceType?: "module" | "script";
+  filename?: string;
+  features?: Object;
+  plugins?: Object;
+};