diff --git a/packages/flutter_markdown/test/link_test.dart b/packages/flutter_markdown/test/link_test.dart
index 1092a6c44e..9a50477822 100644
--- a/packages/flutter_markdown/test/link_test.dart
+++ b/packages/flutter_markdown/test/link_test.dart
@@ -15,8 +15,8 @@ void defineTests() {
     testWidgets(
       'should work with nested elements',
       (WidgetTester tester) async {
-        List<MarkdownLink> linkTapResults = <MarkdownLink>[];
-        const String data = '[Link `with nested code` Text](href)';
+        final linkTapResults = <MarkdownLink>[];
+        const data = '[Link `with nested code` Text](href)';
         await tester.pumpWidget(
           boilerplate(
             Markdown(
@@ -28,14 +28,16 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
 
-        final List<Type> gestureRecognizerTypes = <Type>[];
+        final gestureRecognizerTypes = <Type>[];
         span.visitChildren((InlineSpan inlineSpan) {
           if (inlineSpan is TextSpan) {
-            TapGestureRecognizer recognizer = inlineSpan.recognizer as TapGestureRecognizer;
-            gestureRecognizerTypes.add(recognizer.runtimeType);
-            recognizer.onTap!();
+            final recognizer = inlineSpan.recognizer as TapGestureRecognizer?;
+            gestureRecognizerTypes.add(recognizer?.runtimeType ?? Null);
+            if (recognizer != null) {
+              recognizer.onTap!();
+            }
           }
           return true;
         });
@@ -56,9 +58,8 @@ void defineTests() {
     testWidgets(
       'should work next to other links',
       (WidgetTester tester) async {
-        List<MarkdownLink> linkTapResults = <MarkdownLink>[];
-        const String data =
-            '[First Link](firstHref) and [Second Link](secondHref)';
+        final linkTapResults = <MarkdownLink>[];
+        const data = '[First Link](firstHref) and [Second Link](secondHref)';
         await tester.pumpWidget(
           boilerplate(
             Markdown(
@@ -69,16 +70,18 @@ void defineTests() {
           ),
         );
 
-        final RichText textWidget =
+        final textWidget =
             tester.widgetList(find.byType(RichText)).first as RichText;
         final TextSpan span = textWidget.text as TextSpan;
 
-        final List<Type> gestureRecognizerTypes = <Type>[];
+        final gestureRecognizerTypes = <Type>[];
         span.visitChildren((InlineSpan inlineSpan) {
           if (inlineSpan is TextSpan) {
-            TapGestureRecognizer? recognizer = inlineSpan.recognizer as TapGestureRecognizer?;
-            gestureRecognizerTypes.add(recognizer.runtimeType);
-            recognizer?.onTap!();
+            final recognizer = inlineSpan.recognizer as TapGestureRecognizer?;
+            gestureRecognizerTypes.add(recognizer?.runtimeType ?? Null);
+            if (recognizer != null) {
+              recognizer.onTap!();
+            }
           }
           return true;
         });
@@ -99,7 +102,7 @@ void defineTests() {
       // Example 493 from GFM.
       'simple inline link',
       (WidgetTester tester) async {
-        const String data = '[link](/uri "title")';
+        const data = '[link](/uri "title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -119,7 +122,7 @@ void defineTests() {
     testWidgets(
       'empty inline link',
       (WidgetTester tester) async {
-        const String data = '[](/uri "title")';
+        const data = '[](/uri "title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -140,7 +143,7 @@ void defineTests() {
       // Example 494 from GFM.
       'simple inline link - title omitted',
       (WidgetTester tester) async {
-        const String data = '[link](/uri)';
+        const data = '[link](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -161,7 +164,7 @@ void defineTests() {
       // Example 495 from GFM.
       'simple inline link - both destination and title omitted',
       (WidgetTester tester) async {
-        const String data = '[link]()';
+        const data = '[link]()';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -182,7 +185,7 @@ void defineTests() {
       // Example 496 from GFM.
       'simple inline link - both < > enclosed destination and title omitted',
       (WidgetTester tester) async {
-        const String data = '[link](<>)';
+        const data = '[link](<>)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -203,7 +206,7 @@ void defineTests() {
       // Example 497 from GFM.
       'link destination with space and not < > enclosed',
       (WidgetTester tester) async {
-        const String data = '[link](/my url)';
+        const data = '[link](/my url)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -225,7 +228,7 @@ void defineTests() {
       // Example 498 from GFM.
       'link destination with space and < > enclosed',
       (WidgetTester tester) async {
-        const String data = '[link](</my url>)';
+        const data = '[link](</my url>)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -249,7 +252,7 @@ void defineTests() {
       // Example 499 from GFM.
       'link destination cannot contain line breaks - not < > enclosed',
       (WidgetTester tester) async {
-        const String data = '[link](foo\nbar)';
+        const data = '[link](foo\nbar)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -271,7 +274,7 @@ void defineTests() {
       // Example 500 from GFM.
       'link destination cannot contain line breaks - < > enclosed',
       (WidgetTester tester) async {
-        const String data = '[link](<foo\nbar>)';
+        const data = '[link](<foo\nbar>)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -293,7 +296,7 @@ void defineTests() {
       // Example 501 from GFM.
       'link destination containing ")" and < > enclosed',
       (WidgetTester tester) async {
-        const String data = '[link](</my)url>)';
+        const data = '[link](</my)url>)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -339,8 +342,7 @@ void defineTests() {
       // Example 503 from GFM.
       'opening pointy brackets are not properly matched',
       (WidgetTester tester) async {
-        const String data =
-            '[link](<foo)bar\n[link](<foo)bar>\n[link](<foo>bar)';
+        const data = '[link](<foo)bar\n[link](<foo)bar>\n[link](<foo>bar)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -362,7 +364,7 @@ void defineTests() {
       // Example 504 from GFM.
       'parentheses inside link destination may be escaped',
       (WidgetTester tester) async {
-        const String data = '[link](\(foo\))';
+        const data = '[link](\(foo\))';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -383,7 +385,7 @@ void defineTests() {
       // Example 505 from GFM.
       'multiple balanced parentheses are allowed without escaping',
       (WidgetTester tester) async {
-        const String data = '[link](foo(and(bar)))';
+        const data = '[link](foo(and(bar)))';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -404,7 +406,7 @@ void defineTests() {
       // Example 506 from GFM.
       'escaped unbalanced parentheses',
       (WidgetTester tester) async {
-        const String data = '[link](foo\(and\(bar\))';
+        const data = '[link](foo\(and\(bar\))';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -428,7 +430,7 @@ void defineTests() {
       // Example 507 from GFM.
       'pointy brackets enclosed unbalanced parentheses',
       (WidgetTester tester) async {
-        const String data = '[link](<foo(and(bar)>)';
+        const data = '[link](<foo(and(bar)>)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -449,7 +451,7 @@ void defineTests() {
       // Example 508 from GFM.
       'parentheses and other symbols can be escaped',
       (WidgetTester tester) async {
-        const String data = '[link](foo\)\:)';
+        const data = '[link](foo\)\:)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -473,7 +475,7 @@ void defineTests() {
       // Example 509 case 1 from GFM.
       'link destinations with just fragment identifier',
       (WidgetTester tester) async {
-        const String data = '[link](#fragment)';
+        const data = '[link](#fragment)';
 
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
@@ -495,7 +497,7 @@ void defineTests() {
       // Example 509 case 2 from GFM.
       'link destinations with URL and fragment identifier',
       (WidgetTester tester) async {
-        const String data = '[link](http://example.com#fragment)';
+        const data = '[link](http://example.com#fragment)';
 
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
@@ -518,7 +520,7 @@ void defineTests() {
       // Example 509 case 3 from GFM.
       'link destinations with URL, fragment identifier, and query',
       (WidgetTester tester) async {
-        const String data = '[link](http://example.com?foo=3#fragment)';
+        const data = '[link](http://example.com?foo=3#fragment)';
 
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
@@ -541,7 +543,7 @@ void defineTests() {
       // Example 510 from GFM.
       'link destinations with backslash before non-escapable character',
       (WidgetTester tester) async {
-        const String data = '[link](foo\bar)';
+        const data = '[link](foo\bar)';
 
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
@@ -563,7 +565,7 @@ void defineTests() {
       // Example 511 from GFM.
       'URL escaping should be left alone inside link destination',
       (WidgetTester tester) async {
-        const String data = '[link](foo%20b&auml;)';
+        const data = '[link](foo%20b&auml;)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -584,7 +586,7 @@ void defineTests() {
       // Example 512 from GFM.
       'omitting link destination uses title for destination',
       (WidgetTester tester) async {
-        const String data = '[link]("title")';
+        const data = '[link]("title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -605,7 +607,7 @@ void defineTests() {
       // Example 513a from GFM.
       'link title in double quotes',
       (WidgetTester tester) async {
-        const String data = '[link](/url "title")';
+        const data = '[link](/url "title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -626,7 +628,7 @@ void defineTests() {
       // Example 513b from GFM.
       'link title in single quotes',
       (WidgetTester tester) async {
-        const String data = '[link](/url \'title\')';
+        const data = '[link](/url \'title\')';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -647,7 +649,7 @@ void defineTests() {
       // Example 513c from GFM.
       'link title in parentheses',
       (WidgetTester tester) async {
-        const String data = '[link](/url (title))';
+        const data = '[link](/url (title))';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -668,7 +670,7 @@ void defineTests() {
       // Example 514 from GFM.
       'backslash escapes, entity, and numeric character references are allowed in title',
       (WidgetTester tester) async {
-        const String data = '[link](/url "title \"&quot;")';
+        const data = '[link](/url "title \"&quot;")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -693,7 +695,7 @@ void defineTests() {
       // Example 515 from GFM.
       'link title must be separated with whitespace and not Unicode whitespace',
       (WidgetTester tester) async {
-        const String data = '[link](/url\u{C2A0}"title")';
+        const data = '[link](/url\u{C2A0}"title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -715,7 +717,7 @@ void defineTests() {
       // Example 516 from GFM.
       'nested balanced quotes are not allowed without escaping',
       (WidgetTester tester) async {
-        const String data = '[link](/url "title "and" title")';
+        const data = '[link](/url "title "and" title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -737,7 +739,7 @@ void defineTests() {
       // Example 517 from GFM.
       'nested balanced quotes using different quote type',
       (WidgetTester tester) async {
-        const String data = '[link](/url \'title "and" title\')';
+        const data = '[link](/url \'title "and" title\')';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -759,7 +761,7 @@ void defineTests() {
       // Example 518 from GFM.
       'whitespace is allowed around the destination and title',
       (WidgetTester tester) async {
-        const String data = '[link](   /url  "title")';
+        const data = '[link](   /url  "title")';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -780,7 +782,7 @@ void defineTests() {
       // Example 519 from GFM.
       'whitespace is not allowed between link text and following parentheses',
       (WidgetTester tester) async {
-        const String data = '[link] (/url)';
+        const data = '[link] (/url)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -802,7 +804,7 @@ void defineTests() {
       // Example 520 from GFM.
       'link text may contain balanced brackets',
       (WidgetTester tester) async {
-        const String data = '[link [foo [bar]]](/uri)';
+        const data = '[link [foo [bar]]](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -823,7 +825,7 @@ void defineTests() {
       // Example 521 from GFM.
       'link text may not contain unbalanced brackets',
       (WidgetTester tester) async {
-        const String data = '[link] bar](/uri)';
+        const data = '[link] bar](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -845,7 +847,7 @@ void defineTests() {
       // Example 522 from GFM.
       'link text may not contain unbalanced brackets - unintended link text',
       (WidgetTester tester) async {
-        const String data = '[link [bar](/uri)';
+        const data = '[link [bar](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -872,7 +874,7 @@ void defineTests() {
       // Example 523 from GFM.
       'link text with escaped open square bracket',
       (WidgetTester tester) async {
-        const String data = r'[link \[bar](/uri)';
+        const data = r'[link \[bar](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -893,7 +895,7 @@ void defineTests() {
       // Example 524 from GFM.
       'link text with inline emphasis and code',
       (WidgetTester tester) async {
-        const String data = '[link *foo **bar** `#`*](/uri)';
+        const data = '[link *foo **bar** `#`*](/uri)';
         List<MarkdownLink> linkTapResults = <MarkdownLink>[];
         await tester.pumpWidget(
           boilerplate(
@@ -906,9 +908,10 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 5);
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
         expectTextSpanStyle(
             span.children![1] as TextSpan, FontStyle.italic, FontWeight.normal);
         expectTextSpanStyle(
@@ -917,10 +920,11 @@ void defineTests() {
             span.children![3] as TextSpan, FontStyle.italic, FontWeight.normal);
         expect((span.children![4] as TextSpan).style!.fontFamily, 'monospace');
 
-        final List<Type> gestureRecognizerTypes = <Type>[];
+        final gestureRecognizerTypes = <Type>[];
         span.visitChildren((InlineSpan inlineSpan) {
           if (inlineSpan is TextSpan) {
-            TapGestureRecognizer recognizer = inlineSpan.recognizer as TapGestureRecognizer;
+            TapGestureRecognizer recognizer =
+                inlineSpan.recognizer as TapGestureRecognizer;
             gestureRecognizerTypes.add(recognizer.runtimeType);
             recognizer.onTap!();
           }
@@ -942,7 +946,7 @@ void defineTests() {
       // Example 525 from GFM.
       'inline image link text',
       (WidgetTester tester) async {
-        const String data = '[![moon](moon.jpg)](/uri)';
+        const data = '[![moon](moon.jpg)](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -956,7 +960,7 @@ void defineTests() {
 
         final gestureFinder = find.byType(GestureDetector);
         expect(gestureFinder, findsOneWidget);
-        final GestureDetector gestureWidget =
+        final gestureWidget =
             gestureFinder.evaluate().first.widget as GestureDetector;
         expect(gestureWidget.child, isA<Image>());
         expect(gestureWidget.onTap, isNotNull);
@@ -970,7 +974,7 @@ void defineTests() {
       // Example 526 from GFM.
       'links cannot be nested - outter link ignored',
       (WidgetTester tester) async {
-        const String data = '[foo [bar](/uri)](/uri)';
+        const data = '[foo [bar](/uri)](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -983,7 +987,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 3);
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo ');
@@ -1000,7 +1004,7 @@ void defineTests() {
       // Example 527 from GFM.
       'links cannot be nested - outter link ignored with emphasis',
       (WidgetTester tester) async {
-        const String data = '[foo *[bar [baz](/uri)](/uri)*](/uri)';
+        const data = '[foo *[bar [baz](/uri)](/uri)*](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1013,12 +1017,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 5);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0].toPlainText(), '[foo ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), '[bar ');
         expectTextSpanStyle(
@@ -1033,7 +1038,8 @@ void defineTests() {
             span.children![3] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![4].toPlainText(), '](/uri)');
-        expectTextSpanStyle(span.children![4] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![4] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![2] as TextSpan, 'baz');
         expectLinkTap(linkTapResults, MarkdownLink('baz', '/uri'));
@@ -1044,7 +1050,7 @@ void defineTests() {
       // Example 528 from GFM.
       'links cannot be nested in image linksinline image link text',
       (WidgetTester tester) async {
-        const String data = '![[[foo](uri1)](uri2)](uri3)';
+        const data = '![[[foo](uri1)](uri2)](uri3)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1072,7 +1078,7 @@ void defineTests() {
       // Example 529 from GFM.
       'link text grouping has precedence over emphasis grouping example 1',
       (WidgetTester tester) async {
-        const String data = '*[foo*](/uri)';
+        const data = '*[foo*](/uri)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1085,11 +1091,12 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '*');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'foo*');
         expectLinkTap(linkTapResults, MarkdownLink('foo*', '/uri'));
@@ -1103,7 +1110,7 @@ void defineTests() {
       // Example 530 from GFM.
       'link text grouping has precedence over emphasis grouping example 2',
       (WidgetTester tester) async {
-        const String data = '[foo *bar](baz*)';
+        const data = '[foo *bar](baz*)';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1124,7 +1131,7 @@ void defineTests() {
       // Example 531 from GFM.
       'brackets that aren\'t part of links do not take precedence',
       (WidgetTester tester) async {
-        const String data = '*foo [bar* baz]';
+        const data = '*foo [bar* baz]';
         await tester.pumpWidget(
           boilerplate(
             MarkdownBody(data: data),
@@ -1132,7 +1139,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
@@ -1141,7 +1148,8 @@ void defineTests() {
             span.children![0] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), ' baz]');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -1149,7 +1157,7 @@ void defineTests() {
       // Example 532 from GFM.
       'HTML tag takes precedence over link grouping',
       (WidgetTester tester) async {
-        const String data = '[foo <bar attr="](baz)">';
+        const data = '[foo <bar attr="](baz)">';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1171,7 +1179,7 @@ void defineTests() {
       // Example 533 from GFM.
       'code span takes precedence over link grouping',
       (WidgetTester tester) async {
-        const String data = '[foo`](/uri)`';
+        const data = '[foo`](/uri)`';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1187,15 +1195,17 @@ void defineTests() {
         expect(gestureFinder, findsNothing);
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
         expect((span.children![1] as TextSpan).style!.fontFamily, 'monospace');
         expect(linkTapResults, isNull);
       },
@@ -1205,7 +1215,7 @@ void defineTests() {
       // Example 534 from GFM.
       'autolinks take precedence over link grouping',
       (WidgetTester tester) async {
-        const String data = '[foo<http://example.com/?search=](uri)>';
+        const data = '[foo<http://example.com/?search=](uri)>';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1218,12 +1228,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0].toPlainText(), '[foo');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(
             span.children![1] as TextSpan, 'http://example.com/?search=](uri)');
@@ -1239,7 +1250,7 @@ void defineTests() {
       // Example 535 from GFM.
       'simple reference link',
       (WidgetTester tester) async {
-        const String data = '[foo][bar]\n\n[bar]: /url "title"';
+        const data = '[foo][bar]\n\n[bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1260,7 +1271,7 @@ void defineTests() {
       // Example 536 from GFM.
       'reference link with balanced brackets in link text',
       (WidgetTester tester) async {
-        const String data = '[link [foo [bar]]][ref]\n\n[ref]: /uri';
+        const data = '[link [foo [bar]]][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1281,7 +1292,7 @@ void defineTests() {
       // Example 537 from GFM.
       'reference link with unbalanced but escaped bracket in link text',
       (WidgetTester tester) async {
-        const String data = '[link \[bar][ref]\n\n[ref]: /uri';
+        const data = '[link \[bar][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1305,7 +1316,7 @@ void defineTests() {
       // Example 538 from GFM.
       'reference link with inline emphasis and code span in link text',
       (WidgetTester tester) async {
-        const String data = '[link *foo **bar** `#`*][ref]\n\n[ref]: /uri';
+        const data = '[link *foo **bar** `#`*][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1318,12 +1329,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 5);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0].toPlainText(), 'link ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), 'foo ');
         expectTextSpanStyle(
@@ -1338,14 +1350,15 @@ void defineTests() {
             span.children![3] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![4].toPlainText(), '#');
-        expectTextSpanStyle(span.children![4] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![4] as TextSpan, null, FontWeight.normal);
         expect((span.children![4] as TextSpan).style!.fontFamily, 'monospace');
 
         span.children!.forEach((element) {
-          TextSpan textSpan = element as TextSpan;
+          final textSpan = element as TextSpan;
           expect(textSpan.recognizer, isNotNull);
           expect(textSpan.recognizer, isA<TapGestureRecognizer>());
-          final TapGestureRecognizer tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
+          final tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
           expect(tapRecognizer.onTap, isNotNull);
 
           tapRecognizer.onTap!();
@@ -1361,7 +1374,7 @@ void defineTests() {
       // Example 539 from GFM.
       'referenence link with inline image link text',
       (WidgetTester tester) async {
-        const String data = '[![moon](moon.jpg)][ref]\n\n[ref]: /uri';
+        const data = '[![moon](moon.jpg)][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1375,7 +1388,7 @@ void defineTests() {
 
         final gestureFinder = find.byType(GestureDetector);
         expect(gestureFinder, findsOneWidget);
-        final GestureDetector gestureWidget =
+        final gestureWidget =
             gestureFinder.evaluate().first.widget as GestureDetector;
         expect(gestureWidget.child, isA<Image>());
         expect(gestureWidget.onTap, isNotNull);
@@ -1389,7 +1402,7 @@ void defineTests() {
       // Example 540 from GFM.
       'reference links cannot have nested links',
       (WidgetTester tester) async {
-        const String data = '[foo [bar](/uri)][ref]\n\n[ref]: /uri';
+        const data = '[foo [bar](/uri)][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1402,7 +1415,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 4);
 
         expect(span.children![0], isA<TextSpan>());
@@ -1423,7 +1436,7 @@ void defineTests() {
       // Example 541 from GFM.
       'reference links cannot have nested reference links',
       (WidgetTester tester) async {
-        const String data = '[foo *bar [baz][ref]*][ref]\n\n[ref]: /uri';
+        const data = '[foo *bar [baz][ref]*][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1436,12 +1449,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 5);
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expect(span.children![1], isA<TextSpan>());
         expect(span.children![1].toPlainText(), 'bar ');
@@ -1455,10 +1469,12 @@ void defineTests() {
 
         expect(span.children![3], isA<TextSpan>());
         expect(span.children![3].toPlainText(), ']');
-        expectTextSpanStyle(span.children![3] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![3] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![4] as TextSpan, 'ref');
-        expectTextSpanStyle(span.children![4] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![4] as TextSpan, null, FontWeight.normal);
         expectLinkTap(linkTapResults, MarkdownLink('ref', '/uri'));
       },
     );
@@ -1467,7 +1483,7 @@ void defineTests() {
       // Example 542 from GFM.
       'reference link text grouping has precedence over emphasis grouping example 1',
       (WidgetTester tester) async {
-        const String data = '*[foo*][ref]\n\n[ref]: /uri';
+        const data = '*[foo*][ref]\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1480,11 +1496,12 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '*');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'foo*');
         expectLinkTap(linkTapResults, MarkdownLink('foo*', '/uri'));
@@ -1498,7 +1515,7 @@ void defineTests() {
       // Example 543 from GFM.
       'reference link text grouping has precedence over emphasis grouping example 2',
       (WidgetTester tester) async {
-        const String data = '[foo *bar][ref]*\n\n[ref]: /uri';
+        const data = '[foo *bar][ref]*\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1511,16 +1528,18 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expectLinkTextSpan(span.children![0] as TextSpan, 'foo *bar');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
         expectLinkTap(linkTapResults, MarkdownLink('foo *bar', '/uri'));
 
         expect(span.children![1], isA<TextSpan>());
         expect(span.children![1].toPlainText(), '*');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -1528,7 +1547,7 @@ void defineTests() {
       // Example 544 from GFM.
       'HTML tag takes precedence over reference link grouping',
       (WidgetTester tester) async {
-        const String data = '[foo <bar attr="][ref]">\n\n[ref]: /uri';
+        const data = '[foo <bar attr="][ref]">\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1550,7 +1569,7 @@ void defineTests() {
       // Example 545 from GFM.
       'code span takes precedence over reference link grouping',
       (WidgetTester tester) async {
-        const String data = '[foo`][ref]`\n\n[ref]: /uri';
+        const data = '[foo`][ref]`\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1566,13 +1585,14 @@ void defineTests() {
         expect(gestureFinder, findsNothing);
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), '][ref]');
         expect((span.children![1] as TextSpan).style!.fontFamily, 'monospace');
@@ -1584,8 +1604,7 @@ void defineTests() {
       // Example 534 from GFM.
       'autolinks take precedence over reference link grouping',
       (WidgetTester tester) async {
-        const String data =
-            '[foo<http://example.com/?search=][ref]>\n\n[ref]: /uri';
+        const data = '[foo<http://example.com/?search=][ref]>\n\n[ref]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1598,12 +1617,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
         expect(span.children![0].toPlainText(), '[foo');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(
             span.children![1] as TextSpan, 'http://example.com/?search=][ref]');
@@ -1618,7 +1638,7 @@ void defineTests() {
       // Example 547 from GFM.
       'reference link matching is case-insensitive',
       (WidgetTester tester) async {
-        const String data = '[foo][BaR]\n\n[bar]: /url "title"';
+        const data = '[foo][BaR]\n\n[bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1639,7 +1659,7 @@ void defineTests() {
       // Example 548 from GFM.
       'reference link support Unicode case fold - GFM',
       (WidgetTester tester) async {
-        const String data = '[ẞ]\n\n[SS]: /url';
+        const data = '[ẞ]\n\n[SS]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1665,8 +1685,7 @@ void defineTests() {
       // to the test suite since each example produces different cases to test.
       'reference link support Unicode case fold - CommonMark',
       (WidgetTester tester) async {
-        const String data =
-            '[Толпой][Толпой] is a Russian word.\n\n[ТОЛПОЙ]: /url';
+        const data = '[Толпой][Толпой] is a Russian word.\n\n[ТОЛПОЙ]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1679,7 +1698,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expectLinkTextSpan(span.children![0] as TextSpan, 'Толпой');
@@ -1687,7 +1706,8 @@ void defineTests() {
 
         expect(span.children![1], isA<TextSpan>());
         expect(span.children![1].toPlainText(), ' is a Russian word.');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -1695,7 +1715,7 @@ void defineTests() {
       // Example 549 from GFM.
       'reference link with internal whitespace',
       (WidgetTester tester) async {
-        const String data = '[Foo\n  bar]: /url\n\n[Baz][Foo bar]';
+        const data = '[Foo\n  bar]: /url\n\n[Baz][Foo bar]';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1716,7 +1736,7 @@ void defineTests() {
       // Example 550 from GFM.
       'reference link no whitespace between link text and link label',
       (WidgetTester tester) async {
-        const String data = '[foo] [bar]\n\n[bar]: /url "title"';
+        const data = '[foo] [bar]\n\n[bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1729,12 +1749,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo] ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'bar');
         expectLinkTap(linkTapResults, MarkdownLink('bar', '/url', 'title'));
@@ -1745,7 +1766,7 @@ void defineTests() {
       // Example 551 from GFM.
       'reference link no line break between link text and link label',
       (WidgetTester tester) async {
-        const String data = '[foo]\n[bar]\n\n[bar]: /url "title"';
+        const data = '[foo]\n[bar]\n\n[bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1758,12 +1779,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo] ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'bar');
         expectLinkTap(linkTapResults, MarkdownLink('bar', '/url', 'title'));
@@ -1774,7 +1796,7 @@ void defineTests() {
       // Example 552 from GFM.
       'multiple matching reference link definitions use first definition',
       (WidgetTester tester) async {
-        const String data = '[foo]: /url1\n\n[foo]: /url2\n\n[bar][foo]';
+        const data = '[foo]: /url1\n\n[foo]: /url2\n\n[bar][foo]';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1795,7 +1817,7 @@ void defineTests() {
       // Example 553 from GFM.
       'reference link matching is performed on normalized strings',
       (WidgetTester tester) async {
-        const String data = '[bar][foo\!]\n\n[foo!]: /url';
+        const data = '[bar][foo\!]\n\n[foo!]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1820,7 +1842,7 @@ void defineTests() {
       // Example 554 from GFM.
       'reference link labels cannot contain brackets - case 1',
       (WidgetTester tester) async {
-        const String data = '[foo][ref[]\n\n[ref[]: /uri';
+        const data = '[foo][ref[]\n\n[ref[]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1832,17 +1854,19 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
         expect(textWidgets[0].text, isA<TextSpan>());
         expect(textWidgets[0].text.toPlainText(), '[foo][ref[]');
-        expectTextSpanStyle(textWidgets[0].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[0].text as TextSpan, null, FontWeight.normal);
 
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[ref[]: /uri');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
 
         expect(linkTapResults, isNull);
       },
@@ -1855,7 +1879,7 @@ void defineTests() {
       // Example 555 from GFM.
       'reference link labels cannot contain brackets - case 2',
       (WidgetTester tester) async {
-        const String data = '[foo][ref[bar]]\n\n[ref[bar]]: /uri';
+        const data = '[foo][ref[bar]]\n\n[ref[bar]]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1867,19 +1891,21 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
         expect(textWidgets[0].text, isNotNull);
         expect(textWidgets[0].text, isA<TextSpan>());
         expect(textWidgets[0].text.toPlainText(), '[foo][ref[bar]]');
-        expectTextSpanStyle(textWidgets[0].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[0].text as TextSpan, null, FontWeight.normal);
 
         expect(textWidgets[1].text, isNotNull);
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[ref[bar]]: /uri');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
 
         expect(linkTapResults, isNull);
       },
@@ -1889,7 +1915,7 @@ void defineTests() {
       // Example 556 from GFM.
       'reference link labels cannot contain brackets - case 3',
       (WidgetTester tester) async {
-        const String data = '[[[foo]]]\n\n[[[foo]]]: /url';
+        const data = '[[[foo]]]\n\n[[[foo]]]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1901,19 +1927,21 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
         expect(textWidgets[0].text, isNotNull);
         expect(textWidgets[0].text, isA<TextSpan>());
         expect(textWidgets[0].text.toPlainText(), '[[[foo]]]');
-        expectTextSpanStyle(textWidgets[0].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[0].text as TextSpan, null, FontWeight.normal);
 
         expect(textWidgets[1].text, isNotNull);
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[[[foo]]]: /url');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
 
         expect(linkTapResults, isNull);
       },
@@ -1923,7 +1951,7 @@ void defineTests() {
       // Example 557 from GFM.
       'reference link labels can have escaped brackets',
       (WidgetTester tester) async {
-        const String data = '[foo][ref\[]\n\n[ref\[]: /uri';
+        const data = '[foo][ref\[]\n\n[ref\[]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1944,7 +1972,7 @@ void defineTests() {
       // Example 558 from GFM.
       'reference link labels can have escaped characters',
       (WidgetTester tester) async {
-        const String data = '[bar\\]: /uri\n\n[bar\\]';
+        const data = '[bar\\]: /uri\n\n[bar\\]';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1968,7 +1996,7 @@ void defineTests() {
       // Example 559 from GFM.
       'reference link labels must contain at least on non-whitespace character - case 1',
       (WidgetTester tester) async {
-        const String data = '[]\n\n[]: /uri';
+        const data = '[]\n\n[]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -1980,19 +2008,21 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
         expect(textWidgets[0].text, isNotNull);
         expect(textWidgets[0].text, isA<TextSpan>());
         expect(textWidgets[0].text.toPlainText(), '[]');
-        expectTextSpanStyle(textWidgets[0].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[0].text as TextSpan, null, FontWeight.normal);
 
         expect(textWidgets[1].text, isNotNull);
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[]: /uri');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
 
         expect(linkTapResults, isNull);
       },
@@ -2002,7 +2032,7 @@ void defineTests() {
       // Example 560 from GFM.
       'reference link labels must contain at least on non-whitespace character - case 2',
       (WidgetTester tester) async {
-        const String data = '[\n ]\n\n[\n ]: /uri';
+        const data = '[\n ]\n\n[\n ]: /uri';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2014,19 +2044,21 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
         expect(textWidgets[0].text, isNotNull);
         expect(textWidgets[0].text, isA<TextSpan>());
         expect(textWidgets[0].text.toPlainText(), '[ ]');
-        expectTextSpanStyle(textWidgets[0].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[0].text as TextSpan, null, FontWeight.normal);
 
         expect(textWidgets[1].text, isNotNull);
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[ ]: /uri');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
 
         expect(linkTapResults, isNull);
       },
@@ -2036,7 +2068,7 @@ void defineTests() {
       // Example 561 from GFM.
       'collapsed reference link',
       (WidgetTester tester) async {
-        const String data = '[foo][]\n\n[foo]: /url "title"';
+        const data = '[foo][]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2057,7 +2089,7 @@ void defineTests() {
       // Example 562 from GFM.
       'collapsed reference link with inline emphasis in link text',
       (WidgetTester tester) async {
-        const String data = '[*foo* bar][]\n\n[*foo* bar]: /url "title"';
+        const data = '[*foo* bar][]\n\n[*foo* bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2070,7 +2102,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
@@ -2079,13 +2111,14 @@ void defineTests() {
             span.children![0] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), ' bar');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
 
         span.children!.forEach((element) {
-          TextSpan textSpan = element as TextSpan;
+          final textSpan = element as TextSpan;
           expect(textSpan.recognizer, isNotNull);
           expect(textSpan.recognizer, isA<TapGestureRecognizer>());
-          final TapGestureRecognizer tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
+          final tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
           expect(tapRecognizer.onTap, isNotNull);
 
           tapRecognizer.onTap!();
@@ -2102,7 +2135,7 @@ void defineTests() {
       // Example 563 from GFM.
       'collapsed reference links are case-insensitive',
       (WidgetTester tester) async {
-        const String data = '[Foo][]\n\n[foo]: /url "title"';
+        const data = '[Foo][]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2123,7 +2156,7 @@ void defineTests() {
       // Example 564 from GFM.
       'collapsed reference link no whitespace between link text and link label',
       (WidgetTester tester) async {
-        const String data = '[foo] \n\n[]\n\n[foo]: /url "title"';
+        const data = '[foo] \n\n[]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2135,7 +2168,7 @@ void defineTests() {
           ),
         );
 
-        final List<RichText> textWidgets =
+        final textWidgets =
             tester.widgetList(find.byType(RichText)).toList().cast<RichText>();
         expect(textWidgets.length, 2);
 
@@ -2151,7 +2184,8 @@ void defineTests() {
         expect(textWidgets[1].text, isNotNull);
         expect(textWidgets[1].text, isA<TextSpan>());
         expect(textWidgets[1].text.toPlainText(), '[]');
-        expectTextSpanStyle(textWidgets[1].text as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            textWidgets[1].text as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -2159,7 +2193,7 @@ void defineTests() {
       // Example 565 from GFM.
       'shortcut reference link',
       (WidgetTester tester) async {
-        const String data = '[foo]\n\n[foo]: /url "title"';
+        const data = '[foo]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2180,7 +2214,7 @@ void defineTests() {
       // Example 566 from GFM.
       'shortcut reference link with inline emphasis in link text',
       (WidgetTester tester) async {
-        const String data = '[*foo* bar]\n\n[*foo* bar]: /url "title"';
+        const data = '[*foo* bar]\n\n[*foo* bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2193,7 +2227,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
@@ -2202,13 +2236,14 @@ void defineTests() {
             span.children![0] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), ' bar');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
 
         span.children!.forEach((element) {
-          TextSpan textSpan = element as TextSpan;
+          final textSpan = element as TextSpan;
           expect(textSpan.recognizer, isNotNull);
           expect(textSpan.recognizer, isA<TapGestureRecognizer>());
-          final TapGestureRecognizer tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
+          final tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
           expect(tapRecognizer.onTap, isNotNull);
 
           tapRecognizer.onTap!();
@@ -2225,7 +2260,7 @@ void defineTests() {
       // Example 567 from GFM.
       'shortcut reference link with inline emphasis nested in link text',
       (WidgetTester tester) async {
-        const String data = '[*foo* bar]\n\n[*foo* bar]: /url "title"';
+        const data = '[*foo* bar]\n\n[*foo* bar]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2238,7 +2273,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children, everyElement(isA<TextSpan>()));
 
@@ -2247,13 +2282,14 @@ void defineTests() {
             span.children![0] as TextSpan, FontStyle.italic, FontWeight.normal);
 
         expect(span.children![1].toPlainText(), ' bar');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
 
         span.children!.forEach((element) {
-          TextSpan textSpan = element as TextSpan;
+          final textSpan = element as TextSpan;
           expect(textSpan.recognizer, isNotNull);
           expect(textSpan.recognizer, isA<TapGestureRecognizer>());
-          final TapGestureRecognizer tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
+          final tapRecognizer = textSpan.recognizer as TapGestureRecognizer;
           expect(tapRecognizer.onTap, isNotNull);
 
           tapRecognizer.onTap!();
@@ -2270,7 +2306,7 @@ void defineTests() {
       // Example 568 from GFM.
       'shortcut reference link with unbalanced open square brackets',
       (WidgetTester tester) async {
-        const String data = '[[bar [foo]\n\n[foo]: /url';
+        const data = '[[bar [foo]\n\n[foo]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2283,12 +2319,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[[bar ');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'foo');
         expectLinkTap(linkTapResults, MarkdownLink('foo', '/url'));
@@ -2299,7 +2336,7 @@ void defineTests() {
       // Example 569 from GFM.
       'shortcut reference links are case-insensitive',
       (WidgetTester tester) async {
-        const String data = '[Foo]\n\n[foo]: /url "title"';
+        const data = '[Foo]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2320,7 +2357,7 @@ void defineTests() {
       // Example 570 from GFM.
       'shortcut reference link should preserve space after link text',
       (WidgetTester tester) async {
-        const String data = '[foo] bar\n\n[foo]: /url';
+        const data = '[foo] bar\n\n[foo]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2333,7 +2370,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expectLinkTextSpan(span.children![0] as TextSpan, 'foo');
@@ -2341,7 +2378,8 @@ void defineTests() {
 
         expect(span.children![1], isA<TextSpan>());
         expect(span.children![1].toPlainText(), ' bar');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -2349,7 +2387,7 @@ void defineTests() {
       // Example 571 from GFM.
       'shortcut reference link backslash escape opening bracket to avoid link',
       (WidgetTester tester) async {
-        const String data = '\[foo]\n\n[foo]: /url "title"';
+        const data = '\[foo]\n\n[foo]: /url "title"';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2374,7 +2412,7 @@ void defineTests() {
       // Example 572 from GFM.
       'shortcut reference link text grouping has precedence over emphasis grouping',
       (WidgetTester tester) async {
-        const String data = '[foo*]: /url\n\n*[foo*]';
+        const data = '[foo*]: /url\n\n*[foo*]';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2387,11 +2425,12 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '*');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'foo*');
         expectLinkTap(linkTapResults, MarkdownLink('foo*', '/url'));
@@ -2405,7 +2444,7 @@ void defineTests() {
       // Example 573 from GFM.
       'full link reference takes precedence over shortcut link reference',
       (WidgetTester tester) async {
-        const String data = '[foo][bar]\n\n[foo]: /url1\n[bar]: /url2';
+        const data = '[foo][bar]\n\n[foo]: /url1\n[bar]: /url2';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2426,7 +2465,7 @@ void defineTests() {
       // Example 574 from GFM.
       'compact link reference takes precedence over shortcut link reference',
       (WidgetTester tester) async {
-        const String data = '[foo][]\n\n[foo]: /url1';
+        const data = '[foo][]\n\n[foo]: /url1';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2447,7 +2486,7 @@ void defineTests() {
       // Example 575 from GFM.
       'inline link reference, no link destination takes precedence over shortcut link reference',
       (WidgetTester tester) async {
-        const String data = '[foo]()\n\n[foo]: /url1';
+        const data = '[foo]()\n\n[foo]: /url1';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2468,7 +2507,7 @@ void defineTests() {
       // Example 576 from GFM.
       'inline link reference, invalid link destination is a link followed by text',
       (WidgetTester tester) async {
-        const String data = '[foo](not a link)\n\n[foo]: /url1';
+        const data = '[foo](not a link)\n\n[foo]: /url1';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2481,7 +2520,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expectLinkTextSpan(span.children![0] as TextSpan, 'foo');
@@ -2489,7 +2528,8 @@ void defineTests() {
 
         expect(span.children![1], isA<TextSpan>());
         expect(span.children![1].toPlainText(), '(not a link)');
-        expectTextSpanStyle(span.children![1] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![1] as TextSpan, null, FontWeight.normal);
       },
     );
 
@@ -2497,7 +2537,7 @@ void defineTests() {
       // Example 577 from GFM.
       'three sequential runs of square-bracketed text, normal text and a link reference',
       (WidgetTester tester) async {
-        const String data = '[foo][bar][baz]\n\n[baz]: /url';
+        const data = '[foo][bar][baz]\n\n[baz]: /url';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2510,12 +2550,13 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo]');
-        expectTextSpanStyle(span.children![0] as TextSpan, null, FontWeight.normal);
+        expectTextSpanStyle(
+            span.children![0] as TextSpan, null, FontWeight.normal);
 
         expectLinkTextSpan(span.children![1] as TextSpan, 'bar');
         expectLinkTap(linkTapResults, MarkdownLink('bar', '/url'));
@@ -2526,7 +2567,7 @@ void defineTests() {
       // Example 578 from GFM.
       'three sequential runs of square-bracketed text, two link references',
       (WidgetTester tester) async {
-        const String data = '[foo][bar][baz]\n\n[baz]: /url1\n[bar]: /url2';
+        const data = '[foo][bar][baz]\n\n[baz]: /url1\n[bar]: /url2';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2539,7 +2580,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
 
         expectLinkTextSpan(span.children![0] as TextSpan, 'foo');
@@ -2554,7 +2595,7 @@ void defineTests() {
       // Example 579 from GFM.
       'full reference link followed by a shortcut reference link',
       (WidgetTester tester) async {
-        const String data = '[foo][bar][baz]\n\n[baz]: /url1\n[foo]: /url2';
+        const data = '[foo][bar][baz]\n\n[baz]: /url1\n[foo]: /url2';
         MarkdownLink? linkTapResults;
         await tester.pumpWidget(
           boilerplate(
@@ -2567,7 +2608,7 @@ void defineTests() {
         );
 
         final RichText textWidget = tester.widget(find.byType(RichText));
-        final TextSpan span = textWidget.text as TextSpan;
+        final span = textWidget.text as TextSpan;
         expect(span.children!.length, 2);
         expect(span.children![0], isA<TextSpan>());
         expect(span.children![0].toPlainText(), '[foo]');