Dart Sass 1.0.0-beta.1

• Drop support for the reference combinator. This has been removed from the spec, and will be deprecated and eventually removed in other implementations.

• Trust type annotations when compiling to JavaScript, which makes it substantially faster.

• Compile to minified JavaScript, which decreases the code size substantially and makes startup a little faster.

• Fix a crash when inspecting a string expression that ended in "\a".

• Fix a bug where declarations and @extend were allowed outside of a style rule in certain circumstances.

• Fix not in parentheses in @supports conditions.

• Allow url as an identifier name.

• Properly parse /***/ in selectors.

• Properly parse unary operators immediately after commas.

• Match Ruby Sass's rounding behavior for all functions.

• Allow \ at the beginning of a selector in the indented syntax.

• Fix a number of @extend bugs:

  • selector-extend() and selector-replace() now allow compound selector extendees.

  • Remove the universal selector * when unifying with other selectors.

  • Properly unify the result of multiple simple selectors in the same compound selector being extended.

  • Properly handle extensions being extended.

  • Properly follow the first law of @extend.

  • Fix selector specificity tracking to follow the second law of @extend.

  • Allow extensions that match selectors but fail to unify.

  • Partially-extended selectors are no longer used as parent selectors.

  • Fix an edge case where both the extender and the extended selector have invalid combinator sequences.

  • Don't crash with a "Bad state: no element" error in certain edge cases.