inline plugin: type options

Summary: Adds a stronger type for the inline plugin to help with future refactors

Reviewed By: jeanlauliac

Differential Revision: D4945842

fbshipit-source-id: f9bde75bf47271d80d2420d985a6a5609cee8952

packager/src/JSTransformer/worker/inline.js

@@ -170,7 +170,7 @@ type AstResult = {
 function inline(
   filename: string,
   transformResult: {ast?: ?Ast, code: string, map: ?SourceMap},
-  options: {},
+  options: {+dev: boolean, +platform: string},
 ): AstResult {
   const code = transformResult.code;
   const babelOptions = {