Adds a simple AST printer

src/bin/dune

@@ -1,4 +1,4 @@
 (executable
  (public_name js_bundler)
  (name main)
- (libraries js_bundler flow_parser))
+ (libraries JSBundler flow_parser))

src/bin/main.re

@@ -1,20 +1,26 @@
-
-
-let parse_source = source => {
+let parse = source => {
   let parse_options =
     Some(
-      Flow_parser.Parser_env.{
-        esproposal_nullish_coalescing: false,
-        esproposal_optional_chaining: false,
-        esproposal_class_instance_fields: true,
-        esproposal_class_static_fields: true,
-        esproposal_decorators: true,
-        esproposal_export_star_as: true,
-        types: true,
-        types_in_comments: false,
+      Parser_env.{
+        components: false,
+        enums: false,
+        esproposal_decorators: false,
+        types: false,
         use_strict: false,
+        module_ref_prefix: None,
+        module_ref_prefix_LEGACY_INTEROP: None,
       },
     );
+  Parser_flow.program(source, ~parse_options);
+};
 
-  Flow_parser.Parser_flow.program(source, ~parse_options);
+let source = {|
+   console.log("Hello, World.");
+|};
+
+let print = ast => {
+  Flow_ast.(Program.show(Loc.pp, Loc.pp, ast));
 };
+
+let (ast, _errors) = parse(source);
+ast |> print |> print_endline;

src/lib/JSBundler.re

@@ -0,0 +1 @@
+let hello = "hello"

src/lib/dune

@@ -1,2 +1,2 @@
 (library
- (name js_bundler))
+ (name JSBundler))