## 1.0.0-beta.6

* Add support for importing an `_index.scss` or `_index.sass` file when
  importing a directory.

* Add a `--load-path` command-line option (alias `-I`) for passing additional
  paths to search for Sass files to import.

### Node JS API

* Import URLs passed to importers are no longer normalized. For example, if a
  stylesheet contains `@import "./foo.scss"`, importers will now receive
  `"./foo.scss"` rather than `"foo.scss"`.

## 1.0.0-beta.5.3

* Support hard tabs in the indented syntax.

* Improve the formatting of comments that don't start on the same line as the
  opening `/*`.

* Preserve whitespace after `and` in media queries in compressed mode.

### Indented Syntax

* Properly parse multi-line selectors.

* Don't deadlock on `/*` comments.

* Don't add an extra `*/` to comments that already have it.

* Preserve empty lines in `/*` comments.

## 1.0.0-beta.5.2

* Fix a bug where some colors would crash `compressed` mode.

## 1.0.0-beta.5.1

* Add a `compressed` output style.

* Emit a warning when `&&` is used, since it's probably not what the user means.

* `round()` now returns the correct results for negative numbers that should
  round down.

* `var()` may now be passed in place of multiple arguments to `rgb()`, `rgba()`,
  `hsl()` and `hsla()`.

* Fix some cases where equivalent numbers wouldn't count as the same keys in
  maps.

* Fix a bug where multiplication like `(1/1px) * (1px/1)` wouldn't properly
  cancel out units.

* Fix a bug where dividing by a compatible unit would produce an invalid
  result.

* Remove a non-`sh`-compatible idiom from the standalone shell script.

### Dart API

* Add a `functions` parameter to `compile()`, `compleString()`,
  `compileAsync()`, and `compileStringAsync()`. This allows users to define
  custom functions in Dart that can be invoked from Sass stylesheets.

* Expose the `Callable` and `AsyncCallable` types, which represent functions
  that can be invoked from Sass.

* Expose the `Value` type and its subclasses, as well as the top-level
  `sassTrue`, `sassFalse`, and `sassNull` values, which represent Sass values
  that may be passed into or returned from custom functions.

* Expose the `OutputStyle` enum, and add a `style` parameter to `compile()`,
  `compleString()`, `compileAsync()`, and `compileStringAsync()` that allows
  users to control the output style.

### Node JS API

* Support the `functions` option.

* Support the `"compressed"` value for the `outputStyle` option.

## 1.0.0-beta.4

* Support unquoted imports in the indented syntax.

* Fix a crash when `:not(...)` extends a selector that appears in
  `:not(:not(...))`.

### Node JS API

* Add support for asynchronous importers to `render()` and `renderSync()`.

### Dart API

* Add `compileAsync()` and `compileStringAsync()` methods. These run
  asynchronously, which allows them to take asynchronous importers (see below).

* Add an `AsyncImporter` class. This allows imports to be resolved
  asynchronously in case no synchronous APIs are available. `AsyncImporter`s are
  only compatible with `compileAysnc()` and `compileStringAsync()`.

## 1.0.0-beta.3

* Properly parse numbers with exponents.

* Don't crash when evaluating CSS variables whose names are entirely
  interpolated (for example, `#{--foo}: ...`).

### Node JS API

* Add support for the `importer` option to `render()` and `renderSync()`.
  Only synchronous importers are currently supported.

### Dart API

* Added an `Importer` class. This can be extended by users to provide support
  for custom resolution for `@import` rules.

* Added built-in `FilesystemImporter` and `PackageImporter` implementations that
  support resolving `file:` and `package:` URLs, respectively.

* Added an `importers` argument to the `compile()` and `compileString()`
  functions that provides `Importer`s to use when resolving `@import` rules.

* Added a `loadPaths` argument to the `compile()` and `compileString()`
  functions that provides paths to search for stylesheets when resolving
  `@import` rules. This is a shorthand for passing `FilesystemImporter`s to the
  `importers` argument.

## 1.0.0-beta.2

* Add support for the `::slotted()` pseudo-element.

* Generated transparent colors will now be emitted as `rgba(0, 0, 0, 0)` rather
  than `transparent`. This works around a bug wherein IE incorrectly handles the
  latter format.

### Command-Line Interface

* Improve the logic for whether to use terminal colors by default.

### Node JS API

* Add support for `data`, `includePaths`, `indentedSyntax`, `lineFeed`,
  `indentWidth`, and `indentType` options to `render()` and `renderSync()`.

* The result object returned by `render()` and `renderSync()` now includes the
  `stats` object which provides metadata about the compilation process.

* The error object thrown by `render()` and `renderSync()` now includes `line`,
  `column`, `file`, `status`, and `formatted` fields. The `message` field and
  `toString()` also provide more information.

### Dart API

* Add a `renderString()` method for rendering Sass source that's not in a file
  on disk.

## 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`][laws].

  * Fix selector specificity tracking to follow the
    [second law of `@extend`][laws].

  * 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.

[laws]: https://github.com/sass/sass/issues/324#issuecomment-4607184

## 1.0.0-alpha.9

* Elements without a namespace (such as `div`) are no longer unified with
  elements with the empty namespace (such as `|div`). This unification didn't
  match the results returned by `is-superselector()`, and was not guaranteed to
  be valid.

* Support `&` within `@at-root`.

* Properly error when a compound selector is followed immediately by `&`.

* Properly handle variable scoping in `@at-root` and nested properties.

* Properly handle placeholder selectors in selector pseudos.

* Properly short-circuit the `or` and `and` operators.

* Support `--$variable`.

* Don't consider unitless numbers equal to numbers with units.

* Warn about using named colors in interpolation.

* Don't emit loud comments in functions.

* Detect import loops.

* Fix `@import` with a `supports()` clause.

* Forbid functions named "and", "or", and "not".

* Fix `type-of()` with a function.

* Emit a nicer error for invalid tokens in a selector.

* Fix `invert()` with a `$weight` parameter.

* Fix a unit-parsing edge-cases.

* Always parse imports with queries as plain CSS imports.

* Support `&` followed by a non-identifier.

* Properly handle split media queries.

* Properly handle a placeholder selector that isn't at the beginning of a
  compound selector.

* Fix more `str-slice()` bugs.

* Fix the `%` operator.

* Allow whitespace between `=` and the mixin name in the indented syntax.

* Fix some slash division edge cases.

* Fix `not` when used like a function.

* Fix attribute selectors with single-character values.

* Fix some bugs with the `call()` function.

* Properly handle a backslash followed by a CRLF sequence in a quoted string.

* Fix numbers divided by colors.

* Support slash-separated numbers in arguments to plain CSS functions.

* Error out if a function is passed an unknown named parameter.

* Improve the speed of loading large files on Node.

* Don't consider browser-prefixed selector pseudos to be superselectors of
  differently- or non-prefixed selector pseudos with the same base name.

* Fix an `@extend` edge case involving multiple combinators in a row.

* Fix a bug where a `@content` block could get incorrectly passed to a mixin.

* Properly isolate the lexical environments of different calls to the same mixin
  and function.

## 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.

## 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.

## 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.

## 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 `@import`s to the top of the document.

## 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`.

## 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.

## 1.0.0-alpha.2

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

## 1.0.0-alpha.1

* Initial alpha release.