amend babel definitions to allow inline plugins without configuration

Summary: Updates babel flow defs to allow for inline plugins without configuration arguments.

Reviewed By: jeanlauliac

Differential Revision: D4442217

fbshipit-source-id: 1b4392bf13977d97984c72cff65b28e62f602300

flow/babel.js.flow

@@ -49,14 +49,14 @@ type GeneratorOptions = {
   sourceFileName?: string,
 };
 
-type InlinePlugin = [string | {} | () => {}, any];
+type InlinePlugin = string | {} | () => {};
 
 // based on https://babeljs.io/docs/usage/options/ -- 2016-11-11
 type __TransformOptions = {
   filename?: string,
   filenameRelative?: string,
   presets?: Array<string | Object>,
-  plugins?: Array<string | Object | InlinePlugin>,
+  plugins?: Array<string | Object | [InlinePlugin] | [InlinePlugin, mixed]>,
   parserOpts?: BabylonOptions,
   generatorOpts?: GeneratorOptions,
   highlightCode?: boolean,

packager/react-packager/src/ModuleGraph/worker/optimize-module.js

@@ -71,10 +71,6 @@ function optimize(transformed, file, originalCode, options): TransformResult {
 }
 
 function optimizeCode(code, map, filename, inliningOptions) {
-  /* $FlowFixMe(>=0.38.0 site=react_native_fb,react_native_oss) - Flow error
-   * detected during the deployment of v0.38.0. To see the error, remove this
-   * comment and run flow
-   */
   return babel.transform(code, {
     plugins: [
       [constantFolding],