Version change log. =0.10= The ParenExpr constructor was removed from the Expression AST (WARNING: might break some builds). The pretty printer was rewritten to automatically parenthesize sub-expressions based on operator precedence. Added a (beta quality) arbitrary instance for all the AST's to generate random JavaScript programs (useful for testing). =0.9.1= Increased the upper bound on data-default in dependencies. See https://github.com/jswebtools/language-ecmascript/pull/5