The Nuclide codebase uses features that are still proposals which require a flag to be enabled. Babylon parses them fine without any flags.
Let's enable them by default as it doesn't cost much, you either are using those features and you don't want the parser to break, or you are not and you don't care.
After this and #218, none of the nuclide files are throwing exceptions! (yay!)
- This brings in the flow test suite that contains a ton of JavaScript parsing edge cases
- This creates snapshot tests using the pretty printer for all of them
- If uncomment `RUN_AST_TESTS` line in `tests/run_specs.js`, it checks ast(pretty_print(x)) == ast(x). Right now, "178 failed, 197 passed, 375 of 377 total". So half of the tests are not passing, most of them are crashes and many of the rest are subtle issues.
Christopher Chedeau