v0.6.0-alpha.2

Changes

• Smaller AST
  • The main goal of this release was to reduce the overall size of the spanned AST nodes. To achieve this a few optimizations were made
    • All constant size tokens were converted from being represented as a Slice to now only being represented as a Position marking the start of that token. The end can easily be calculated since the token is a constant size.
    • The requirement to use Cow<str> has been removed and now the AST nodes are generic over any T.
    • The source property of a Slice is now represented by a SourceText new type wrapper around T, helpers have been provided for this type with T of &str, String and Cow<str>.
  • To make these changes slightly easier to manage, all the conversion from spanned to non-spanned nodes was moved to its own module resast::spanned::convert
  • Nodes with duplicated data were re-structured to reduce that duplication
    • NormalImportSpec and ExportSpecifier, now has an Option for the local value which was renamed alias
    • TemplateElement is no longer represented as both cooked and raw but instead matches the StringLit pattern, that is the properties open_quote, close_quote, content
    • RegEx::flags is now an Option
  • Position was updated to hold u32 values instead of usize meaning any 64 bit architectures should see this type reduced to half its previous size.
  • A new spanned::Boolean is provided instead of spanned::Lit::Boolean holding a Slice
  • A new module was added containing new-type wrappers around Position for all fixed-sized nodes called spanned::tokens
    • These new types implement a new trait Token that provides an interface to get the &'static str for the token along with the start and end Position values. Any type that implements Token should also implement Node