Not using SyntaxHighlighter, but I managed to get flutter_highlight working with a MarkdownElementBuilder:

class HighlightBuilder extends MarkdownElementBuilder {
  @override
  Widget visitElementAfter(md.Element element, TextStyle preferredStyle) {
    if (element.attributes['class'] == null && !element.textContent.trim().contains('\n')) {
      return Container(
          padding: EdgeInsets.only(top: 0.0, right: 4.0, bottom: 1.75, left: 4.0),
          margin: EdgeInsets.symmetric(horizontal: 2.0),
          color: Colors.black12,
          child: Text(
              element.textContent,
              style: TextStyle(fontFamily: 'RobotoMono', fontSize: 12.0)));
    } else {
      var language = 'plaintext';
      final pattern = RegExp(r'^language-(.+)$');
      if (element.attributes['class'] != null && pattern.hasMatch(element.attributes['class'])) {
        language = pattern.firstMatch(element.attributes['class']).group(1);
      }
      return HighlightView(
        element.textContent.trim(),
        language: language,
        theme: themeMap['a11y-light'],
        padding: EdgeInsets.all(12),
        textStyle: TextStyle(fontFamily: 'RobotoMono', fontSize: 12));
    }
  }
}

The builder gets inline and 4 space indented code, as well, so I have some basic handling of that in there. You can return null, instead, if you don't want to handle those. I couldn't find a built-in monospace font in Flutter, so I used RobotoMono. You'll need to drop the font file in your fonts folder and include it in your pubspec to use it.

To use it, just set it to handle code tags in the Markdown widget:

Markdown(
  data: markdownString,
  builders: {'code': HighlightBuilder()},
  extensionSet: md.ExtensionSet([md.FencedCodeBlockSyntax()], []),
)

If you aren't using other syntaxes, you don't don't need the ExtensionSet line, but if you are, you have to include FencedCodeBlockSyntax.

If you're looking to use SyntaxHighligher specifically, someone did make one for Dart here.

Add Syntax Highlighter #81755

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