diff --git a/lib/src/ast/sass/statement/function_rule.dart b/lib/src/ast/sass/statement/function_rule.dart
index 9242bf858..885bd4ef9 100644
--- a/lib/src/ast/sass/statement/function_rule.dart
+++ b/lib/src/ast/sass/statement/function_rule.dart
@@ -6,11 +6,8 @@ import 'package:source_span/source_span.dart';
 
 import '../../../util/span.dart';
 import '../../../visitor/interface/statement.dart';
-import '../argument_declaration.dart';
 import '../declaration.dart';
-import '../statement.dart';
 import 'callable_declaration.dart';
-import 'silent_comment.dart';
 
 /// A function declaration.
 ///
@@ -21,10 +18,8 @@ final class FunctionRule extends CallableDeclaration
     implements SassDeclaration {
   FileSpan get nameSpan => span.withoutInitialAtRule().initialIdentifier();
 
-  FunctionRule(String name, ArgumentDeclaration arguments,
-      Iterable<Statement> children, FileSpan span,
-      {SilentComment? comment})
-      : super(name, arguments, children, span, comment: comment);
+  FunctionRule(super.name, super.arguments, super.children, super.span,
+      {super.comment});
 
   T accept<T>(StatementVisitor<T> visitor) => visitor.visitFunctionRule(this);
 
diff --git a/lib/src/ast/sass/statement/if_rule.dart b/lib/src/ast/sass/statement/if_rule.dart
index 2a92ac28c..0e611df12 100644
--- a/lib/src/ast/sass/statement/if_rule.dart
+++ b/lib/src/ast/sass/statement/if_rule.dart
@@ -94,7 +94,7 @@ final class IfClause extends IfRuleClause {
 ///
 /// {@category AST}
 final class ElseClause extends IfRuleClause {
-  ElseClause(Iterable<Statement> children) : super(children);
+  ElseClause(super.children);
 
   String toString() => "@else {${children.join(' ')}}";
 }
diff --git a/lib/src/ast/sass/statement/mixin_rule.dart b/lib/src/ast/sass/statement/mixin_rule.dart
index 624eff53e..650e64b65 100644
--- a/lib/src/ast/sass/statement/mixin_rule.dart
+++ b/lib/src/ast/sass/statement/mixin_rule.dart
@@ -7,12 +7,9 @@ import 'package:source_span/source_span.dart';
 import '../../../util/span.dart';
 import '../../../visitor/interface/statement.dart';
 import '../../../visitor/statement_search.dart';
-import '../argument_declaration.dart';
 import '../declaration.dart';
-import '../statement.dart';
 import 'callable_declaration.dart';
 import 'content_rule.dart';
-import 'silent_comment.dart';
 
 /// A mixin declaration.
 ///
@@ -31,10 +28,8 @@ final class MixinRule extends CallableDeclaration implements SassDeclaration {
     return startSpan.initialIdentifier();
   }
 
-  MixinRule(String name, ArgumentDeclaration arguments,
-      Iterable<Statement> children, FileSpan span,
-      {SilentComment? comment})
-      : super(name, arguments, children, span, comment: comment);
+  MixinRule(super.name, super.arguments, super.children, super.span,
+      {super.comment});
 
   T accept<T>(StatementVisitor<T> visitor) => visitor.visitMixinRule(this);
 
diff --git a/lib/src/ast/selector/complex.dart b/lib/src/ast/selector/complex.dart
index 3d97729ca..f6d417901 100644
--- a/lib/src/ast/selector/complex.dart
+++ b/lib/src/ast/selector/complex.dart
@@ -70,11 +70,10 @@ final class ComplexSelector extends Selector {
   }
 
   ComplexSelector(Iterable<CssValue<Combinator>> leadingCombinators,
-      Iterable<ComplexSelectorComponent> components, FileSpan span,
+      Iterable<ComplexSelectorComponent> components, super.span,
       {this.lineBreak = false})
       : leadingCombinators = List.unmodifiable(leadingCombinators),
-        components = List.unmodifiable(components),
-        super(span) {
+        components = List.unmodifiable(components) {
     if (this.leadingCombinators.isEmpty && this.components.isEmpty) {
       throw ArgumentError(
           "leadingCombinators and components may not both be empty.");
diff --git a/lib/src/ast/selector/compound.dart b/lib/src/ast/selector/compound.dart
index c36662cb0..bcc2beb33 100644
--- a/lib/src/ast/selector/compound.dart
+++ b/lib/src/ast/selector/compound.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import 'package:meta/meta.dart';
-import 'package:source_span/source_span.dart';
 
 import '../../extend/functions.dart';
 import '../../logger.dart';
@@ -43,9 +42,8 @@ final class CompoundSelector extends Selector {
   SimpleSelector? get singleSimple =>
       components.length == 1 ? components.first : null;
 
-  CompoundSelector(Iterable<SimpleSelector> components, FileSpan span)
-      : components = List.unmodifiable(components),
-        super(span) {
+  CompoundSelector(Iterable<SimpleSelector> components, super.span)
+      : components = List.unmodifiable(components) {
     if (this.components.isEmpty) {
       throw ArgumentError("components may not be empty.");
     }
diff --git a/lib/src/ast/selector/list.dart b/lib/src/ast/selector/list.dart
index d432bbfaa..4fc24f7f6 100644
--- a/lib/src/ast/selector/list.dart
+++ b/lib/src/ast/selector/list.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import 'package:meta/meta.dart';
-import 'package:source_span/source_span.dart';
 
 import '../../exception.dart';
 import '../../extend/functions.dart';
@@ -49,9 +48,8 @@ final class SelectorList extends Selector {
     }), ListSeparator.comma);
   }
 
-  SelectorList(Iterable<ComplexSelector> components, FileSpan span)
-      : components = List.unmodifiable(components),
-        super(span) {
+  SelectorList(Iterable<ComplexSelector> components, super.span)
+      : components = List.unmodifiable(components) {
     if (this.components.isEmpty) {
       throw ArgumentError("components may not be empty.");
     }
diff --git a/lib/src/ast/selector/parent.dart b/lib/src/ast/selector/parent.dart
index 18e898652..06f013f05 100644
--- a/lib/src/ast/selector/parent.dart
+++ b/lib/src/ast/selector/parent.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import 'package:meta/meta.dart';
-import 'package:source_span/source_span.dart';
 
 import '../../visitor/interface/selector.dart';
 import '../selector.dart';
@@ -22,7 +21,7 @@ final class ParentSelector extends SimpleSelector {
   /// indicating that the parent selector will not be modified.
   final String? suffix;
 
-  ParentSelector(FileSpan span, {this.suffix}) : super(span);
+  ParentSelector(super.span, {this.suffix});
 
   T accept<T>(SelectorVisitor<T> visitor) => visitor.visitParentSelector(this);
 
diff --git a/lib/src/ast/selector/simple.dart b/lib/src/ast/selector/simple.dart
index 0526eed72..d8ae7864d 100644
--- a/lib/src/ast/selector/simple.dart
+++ b/lib/src/ast/selector/simple.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import 'package:meta/meta.dart';
-import 'package:source_span/source_span.dart';
 
 import '../../exception.dart';
 import '../../logger.dart';
@@ -35,7 +34,7 @@ abstract base class SimpleSelector extends Selector {
   /// sequence will contain 1000 simple selectors.
   int get specificity => 1000;
 
-  SimpleSelector(FileSpan span) : super(span);
+  SimpleSelector(super.span);
 
   /// Parses a simple selector from [contents].
   ///
diff --git a/lib/src/ast/selector/universal.dart b/lib/src/ast/selector/universal.dart
index d714dcb6a..937377164 100644
--- a/lib/src/ast/selector/universal.dart
+++ b/lib/src/ast/selector/universal.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import 'package:meta/meta.dart';
-import 'package:source_span/source_span.dart';
 
 import '../../extend/functions.dart';
 import '../../visitor/interface/selector.dart';
@@ -23,7 +22,7 @@ final class UniversalSelector extends SimpleSelector {
 
   int get specificity => 0;
 
-  UniversalSelector(FileSpan span, {this.namespace}) : super(span);
+  UniversalSelector(super.span, {this.namespace});
 
   T accept<T>(SelectorVisitor<T> visitor) =>
       visitor.visitUniversalSelector(this);
diff --git a/lib/src/configuration.dart b/lib/src/configuration.dart
index 1a65d236a..2bb069480 100644
--- a/lib/src/configuration.dart
+++ b/lib/src/configuration.dart
@@ -119,8 +119,7 @@ final class ExplicitConfiguration extends Configuration {
 
   /// Creates a base [ExplicitConfiguration] with a [values] map and a
   /// [nodeWithSpan].
-  ExplicitConfiguration(Map<String, ConfiguredValue> values, this.nodeWithSpan)
-      : super.implicit(values);
+  ExplicitConfiguration(super.values, this.nodeWithSpan) : super.implicit();
 
   /// Creates an [ExplicitConfiguration] with a [values] map, a [nodeWithSpan]
   /// and if this is a copy a reference to the [_originalConfiguration].
diff --git a/lib/src/embedded/importer/file.dart b/lib/src/embedded/importer/file.dart
index edd0d3537..d6096eb7b 100644
--- a/lib/src/embedded/importer/file.dart
+++ b/lib/src/embedded/importer/file.dart
@@ -3,7 +3,6 @@
 // https://opensource.org/licenses/MIT.
 
 import '../../importer.dart';
-import '../compilation_dispatcher.dart';
 import '../embedded_sass.pb.dart' hide SourceSpan;
 import 'base.dart';
 
@@ -19,8 +18,7 @@ final class FileImporter extends ImporterBase {
   /// The host-provided ID of the importer to invoke.
   final int _importerId;
 
-  FileImporter(CompilationDispatcher dispatcher, this._importerId)
-      : super(dispatcher);
+  FileImporter(super.dispatcher, this._importerId);
 
   Uri? canonicalize(Uri url) {
     if (url.scheme == 'file') return _filesystemImporter.canonicalize(url);
diff --git a/lib/src/embedded/importer/host.dart b/lib/src/embedded/importer/host.dart
index 66e60848a..25245721b 100644
--- a/lib/src/embedded/importer/host.dart
+++ b/lib/src/embedded/importer/host.dart
@@ -6,7 +6,6 @@ import '../../exception.dart';
 import '../../importer.dart';
 import '../../importer/utils.dart';
 import '../../util/span.dart';
-import '../compilation_dispatcher.dart';
 import '../embedded_sass.pb.dart' hide SourceSpan;
 import '../utils.dart';
 import 'base.dart';
@@ -20,10 +19,9 @@ final class HostImporter extends ImporterBase {
   /// [canonicalize].
   final Set<String> _nonCanonicalSchemes;
 
-  HostImporter(CompilationDispatcher dispatcher, this._importerId,
-      Iterable<String> nonCanonicalSchemes)
-      : _nonCanonicalSchemes = Set.unmodifiable(nonCanonicalSchemes),
-        super(dispatcher) {
+  HostImporter(
+      super.dispatcher, this._importerId, Iterable<String> nonCanonicalSchemes)
+      : _nonCanonicalSchemes = Set.unmodifiable(nonCanonicalSchemes) {
     for (var scheme in _nonCanonicalSchemes) {
       if (isValidUrlScheme(scheme)) continue;
       throw SassException(
diff --git a/lib/src/exception.dart b/lib/src/exception.dart
index 38a1a057e..69dbbe7e5 100644
--- a/lib/src/exception.dart
+++ b/lib/src/exception.dart
@@ -28,10 +28,9 @@ class SassException extends SourceSpanException {
   /// compilation, before it failed.
   final Set<Uri> loadedUrls;
 
-  SassException(String message, FileSpan span, [Iterable<Uri>? loadedUrls])
+  SassException(super.message, FileSpan super.span, [Iterable<Uri>? loadedUrls])
       : loadedUrls =
-            loadedUrls == null ? const {} : Set.unmodifiable(loadedUrls),
-        super(message, span);
+            loadedUrls == null ? const {} : Set.unmodifiable(loadedUrls);
 
   /// Converts this to a [MultiSpanSassException] with the additional [span] and
   /// [label].
@@ -224,9 +223,7 @@ class SassFormatException extends SassException
   SassFormatException withLoadedUrls(Iterable<Uri> loadedUrls) =>
       SassFormatException(message, span, loadedUrls);
 
-  SassFormatException(String message, FileSpan span,
-      [Iterable<Uri>? loadedUrls])
-      : super(message, span, loadedUrls);
+  SassFormatException(super.message, super.span, [super.loadedUrls]);
 }
 
 /// A [SassFormatException] that's also a [MultiSpanFormatException].
@@ -248,10 +245,9 @@ class MultiSpanSassFormatException extends MultiSpanSassException
       MultiSpanSassFormatException(
           message, span, primaryLabel, secondarySpans, loadedUrls);
 
-  MultiSpanSassFormatException(String message, FileSpan span,
-      String primaryLabel, Map<FileSpan, String> secondarySpans,
-      [Iterable<Uri>? loadedUrls])
-      : super(message, span, primaryLabel, secondarySpans, loadedUrls);
+  MultiSpanSassFormatException(
+      super.message, super.span, super.primaryLabel, super.secondarySpans,
+      [super.loadedUrls]);
 }
 
 /// An exception thrown by SassScript.
@@ -287,9 +283,8 @@ class MultiSpanSassScriptException extends SassScriptException {
   final Map<FileSpan, String> secondarySpans;
 
   MultiSpanSassScriptException(
-      String message, this.primaryLabel, Map<FileSpan, String> secondarySpans)
-      : secondarySpans = Map.unmodifiable(secondarySpans),
-        super(message);
+      super.message, this.primaryLabel, Map<FileSpan, String> secondarySpans)
+      : secondarySpans = Map.unmodifiable(secondarySpans);
 
   /// Converts this to a [SassException] with the given primary [span].
   MultiSpanSassException withSpan(FileSpan span) =>
diff --git a/lib/src/extend/functions.dart b/lib/src/extend/functions.dart
index 6299c5fcf..01d70d248 100644
--- a/lib/src/extend/functions.dart
+++ b/lib/src/extend/functions.dart
@@ -9,6 +9,7 @@
 /// aren't instance methods on other objects because their APIs aren't a good
 /// fit—usually because they deal with raw component lists rather than selector
 /// classes, to reduce allocations.
+library;
 
 import 'dart:collection';
 
diff --git a/lib/src/parse/at_root_query.dart b/lib/src/parse/at_root_query.dart
index 11eee11f2..a107458c1 100644
--- a/lib/src/parse/at_root_query.dart
+++ b/lib/src/parse/at_root_query.dart
@@ -5,16 +5,12 @@
 import 'package:charcode/charcode.dart';
 
 import '../ast/sass.dart';
-import '../interpolation_map.dart';
-import '../logger.dart';
 import 'parser.dart';
 
 /// A parser for `@at-root` queries.
 class AtRootQueryParser extends Parser {
-  AtRootQueryParser(String contents,
-      {Object? url, Logger? logger, InterpolationMap? interpolationMap})
-      : super(contents,
-            url: url, logger: logger, interpolationMap: interpolationMap);
+  AtRootQueryParser(super.contents,
+      {super.url, super.logger, super.interpolationMap});
 
   AtRootQuery parse() {
     return wrapSpanFormatException(() {
diff --git a/lib/src/parse/css.dart b/lib/src/parse/css.dart
index 6ed9123b7..754a3614a 100644
--- a/lib/src/parse/css.dart
+++ b/lib/src/parse/css.dart
@@ -7,7 +7,6 @@ import 'package:string_scanner/string_scanner.dart';
 
 import '../ast/sass.dart';
 import '../functions.dart';
-import '../logger.dart';
 import 'scss.dart';
 
 /// The set of all function names disallowed in plain CSS.
@@ -31,8 +30,7 @@ final _disallowedFunctionNames =
 class CssParser extends ScssParser {
   bool get plainCss => true;
 
-  CssParser(String contents, {Object? url, Logger? logger})
-      : super(contents, url: url, logger: logger);
+  CssParser(super.contents, {super.url, super.logger});
 
   void silentComment() {
     var start = scanner.state;
diff --git a/lib/src/parse/keyframe_selector.dart b/lib/src/parse/keyframe_selector.dart
index 71908c3e3..25a690813 100644
--- a/lib/src/parse/keyframe_selector.dart
+++ b/lib/src/parse/keyframe_selector.dart
@@ -4,17 +4,13 @@
 
 import 'package:charcode/charcode.dart';
 
-import '../interpolation_map.dart';
-import '../logger.dart';
 import '../util/character.dart';
 import 'parser.dart';
 
 /// A parser for `@keyframes` block selectors.
 class KeyframeSelectorParser extends Parser {
-  KeyframeSelectorParser(String contents,
-      {Object? url, Logger? logger, InterpolationMap? interpolationMap})
-      : super(contents,
-            url: url, logger: logger, interpolationMap: interpolationMap);
+  KeyframeSelectorParser(super.contents,
+      {super.url, super.logger, super.interpolationMap});
 
   List<String> parse() {
     return wrapSpanFormatException(() {
diff --git a/lib/src/parse/media_query.dart b/lib/src/parse/media_query.dart
index be86a1994..ce54dae57 100644
--- a/lib/src/parse/media_query.dart
+++ b/lib/src/parse/media_query.dart
@@ -5,17 +5,13 @@
 import 'package:charcode/charcode.dart';
 
 import '../ast/css.dart';
-import '../interpolation_map.dart';
-import '../logger.dart';
 import '../utils.dart';
 import 'parser.dart';
 
 /// A parser for `@media` queries.
 class MediaQueryParser extends Parser {
-  MediaQueryParser(String contents,
-      {Object? url, Logger? logger, InterpolationMap? interpolationMap})
-      : super(contents,
-            url: url, logger: logger, interpolationMap: interpolationMap);
+  MediaQueryParser(super.contents,
+      {super.url, super.logger, super.interpolationMap});
 
   List<CssMediaQuery> parse() {
     return wrapSpanFormatException(() {
diff --git a/lib/src/parse/sass.dart b/lib/src/parse/sass.dart
index 95fd054c5..78dea3179 100644
--- a/lib/src/parse/sass.dart
+++ b/lib/src/parse/sass.dart
@@ -7,7 +7,6 @@ import 'package:string_scanner/string_scanner.dart';
 
 import '../ast/sass.dart';
 import '../interpolation_buffer.dart';
-import '../logger.dart';
 import '../util/character.dart';
 import '../value.dart';
 import 'stylesheet.dart';
@@ -38,8 +37,7 @@ class SassParser extends StylesheetParser {
 
   bool get indented => true;
 
-  SassParser(String contents, {Object? url, Logger? logger})
-      : super(contents, url: url, logger: logger);
+  SassParser(super.contents, {super.url, super.logger});
 
   Interpolation styleRuleSelector() {
     var start = scanner.state;
diff --git a/lib/src/parse/scss.dart b/lib/src/parse/scss.dart
index cc432e9c8..67b5c0f4b 100644
--- a/lib/src/parse/scss.dart
+++ b/lib/src/parse/scss.dart
@@ -16,8 +16,7 @@ class ScssParser extends StylesheetParser {
   bool get indented => false;
   int get currentIndentation => 0;
 
-  ScssParser(String contents, {Object? url, Logger? logger})
-      : super(contents, url: url, logger: logger);
+  ScssParser(super.contents, {super.url, super.logger});
 
   Interpolation styleRuleSelector() => almostAnyValue();
 
diff --git a/lib/src/parse/selector.dart b/lib/src/parse/selector.dart
index 75df8b205..0e5b7a04f 100644
--- a/lib/src/parse/selector.dart
+++ b/lib/src/parse/selector.dart
@@ -6,8 +6,6 @@ import 'package:charcode/charcode.dart';
 
 import '../ast/css/value.dart';
 import '../ast/selector.dart';
-import '../interpolation_map.dart';
-import '../logger.dart';
 import '../util/character.dart';
 import '../utils.dart';
 import 'parser.dart';
@@ -36,16 +34,14 @@ class SelectorParser extends Parser {
   /// Whether this parser allows placeholder selectors beginning with `%`.
   final bool _allowPlaceholder;
 
-  SelectorParser(String contents,
-      {Object? url,
-      Logger? logger,
-      InterpolationMap? interpolationMap,
+  SelectorParser(super.contents,
+      {super.url,
+      super.logger,
+      super.interpolationMap,
       bool allowParent = true,
       bool allowPlaceholder = true})
       : _allowParent = allowParent,
-        _allowPlaceholder = allowPlaceholder,
-        super(contents,
-            url: url, logger: logger, interpolationMap: interpolationMap);
+        _allowPlaceholder = allowPlaceholder;
 
   SelectorList parse() {
     return wrapSpanFormatException(() {
diff --git a/lib/src/parse/stylesheet.dart b/lib/src/parse/stylesheet.dart
index 23c53952e..15c568f66 100644
--- a/lib/src/parse/stylesheet.dart
+++ b/lib/src/parse/stylesheet.dart
@@ -69,8 +69,7 @@ abstract class StylesheetParser extends Parser {
   @protected
   SilentComment? lastSilentComment;
 
-  StylesheetParser(String contents, {Object? url, Logger? logger})
-      : super(contents, url: url, logger: logger);
+  StylesheetParser(super.contents, {super.url, super.logger});
 
   // ## Statements
 
diff --git a/lib/src/value/argument_list.dart b/lib/src/value/argument_list.dart
index f9b4b5014..23de2db7a 100644
--- a/lib/src/value/argument_list.dart
+++ b/lib/src/value/argument_list.dart
@@ -42,8 +42,6 @@ class SassArgumentList extends SassList {
   bool get wereKeywordsAccessed => _wereKeywordsAccessed;
   var _wereKeywordsAccessed = false;
 
-  SassArgumentList(Iterable<Value> contents, Map<String, Value> keywords,
-      ListSeparator separator)
-      : _keywords = Map.unmodifiable(keywords),
-        super(contents, separator);
+  SassArgumentList(super.contents, Map<String, Value> keywords, super.separator)
+      : _keywords = Map.unmodifiable(keywords);
 }
diff --git a/lib/src/value/number/unitless.dart b/lib/src/value/number/unitless.dart
index 7272b7c59..a81d1d9a9 100644
--- a/lib/src/value/number/unitless.dart
+++ b/lib/src/value/number/unitless.dart
@@ -19,8 +19,7 @@ class UnitlessSassNumber extends SassNumber {
   bool get hasUnits => false;
   bool get hasComplexUnits => false;
 
-  UnitlessSassNumber(double value, [(SassNumber, SassNumber)? asSlash])
-      : super.protected(value, asSlash);
+  UnitlessSassNumber(super.value, [super.asSlash]) : super.protected();
 
   SassNumber withValue(num value) => UnitlessSassNumber(value.toDouble());