Parser_env.Eatlet token: env => unit;let push_lex_mode: env => Lex_mode.t => unit;let pop_lex_mode: env => unit;let double_pop_lex_mode: env => unit;let trailing_comments: env => list(Flow_ast.Comment.t(Loc.t));let comments_until_next_line: env => list(Flow_ast.Comment.t(Loc.t));let program_comments: env => list(Flow_ast.Comment.t(Loc.t));