Dart Sass 1.0.0-alpha.8

• Add the content-exists() function.
• Support interpolation in loud comments.
• Fix a bug where even valid semicolons and exclamation marks in custom property values were disallowed.
• Disallow invalid function names.
• Disallow extending across media queries.
• Properly parse whitespace after ... in argument declaration lists.
• Support terse mixin syntax in the indented syntax.
• Fix @at-root query parsing.
• Support special functions in @-moz-document.
• Support ... after a digit.
• Fix some bugs when treating a map as a list of pairs.

Dart Sass 1.0.0-alpha.7

• Fix function-exists(), variable-exists(), and mixin-exists() to use the lexical scope rather than always using the global scope.
• str-index() now correctly inserts at negative indices.
• Properly parse url()s that contain comment-like text.
• Fix a few more small @extend bugs.
• Fix a bug where interpolation in a quoted string was being dropped in some circumstances.
• Properly handle @for rules where each bound has a different unit.
• Forbid mixins and functions from being defined in control directives.
• Fix a superselector-computation edge case involving :not().
• Gracefully handle input files that are invalid UTF-8.
• Print a Sass stack trace when a file fails to load.

Dart Sass 1.0.0-alpha.6

• Allow var() to be passed to rgb(), rgba(), hsl(), and hsla().
• Fix conversions between numbers with dpi, dpcm, and dppx units. Previously these conversions were inverted.
• Don't crash when calling str-slice() with an $end-at index lower than the $start-at index.
• str-slice() now correctly returns "" when $end-at is negative and points before the beginning of the string.
• Interpolation in quoted strings now properly preserves newlines.
• Don't crash when passing only $hue or no keyword arguments to adjust-color(), scale-color(), or change-color().
• Preserve escapes in identifiers. This used to only work for identifiers in SassScript.
• Fix a few small @extend bugs.

Dart Sass 1.0.0-alpha.5

• Fix bounds-checking for opacify(), fade-in(), transparentize(), and fade-out().
• Fix a bug with @extend superselector calculations.
• Fix some cases where #{...}-- would fail to parse in selectors.
• Allow a single number to be passed to saturate() for use in filter contexts.
• Fix a bug where **/ would fail to close a loud comment.
• Fix a bug where mixin and function calls could set variables incorrectly.
• Move plain CSS @imports to the top of the document.

Dart Sass 1.0.0-alpha.4

• Add support for bracketed lists.
• Add support for Unicode ranges.
• Add support for the Microsoft-style = operator.
• Print the filename for @debug rules.
• Fix a bug where 1 + - 2 and similar constructs would crash the parser.
• Fix a bug where @extend produced the wrong result when used with selector combinators.
• Fix a bug where placeholder selectors were not allowed to be unified.
• Fix the mixin-exists() function.
• Fix :nth-child() and :nth-last-child() parsing when they contain of selector.

Dart Sass 1.0.0-alpha.3

• Fix a bug where color equality didn't take the alpha channel into account.
• Fix a bug with converting some RGB colors to HSL.
• Fix a parent selector resolution bug.
• Properly declare the arguments for opacify() and related functions.
• Add a missing dependency on the stack_trace package.
• Fix broken Windows archives.
• Emit colors using their original representation if possible.
• Emit colors without an original representation as names if possible.

Dart Sass 1.0.0-alpha.2

• Fix a bug where variables, functions, and mixins were broken in imported files.

Dart Sass 1.0.0-alpha.1

This is the initial alpha prerelease of Dart Sass. It's not production-ready by any means, but it's complete enough for users to play around with it.