Mix Coding

Mix 2.0 — Correct Code Patterns

This skill ensures you write correct Mix 2.0 code. Mix separates style semantics from widgets using a Spec/Style/Widget pattern with a fluent chaining API.

This is a rigid skill. Follow the documented patterns exactly. Do not guess at method names or API shapes — read the relevant reference file first.

Core Principles

These rules apply to ALL Mix code you write:

1. Always import Mix:

   import 'package:mix/mix.dart';
   

2. Use fluent chaining — styles are built by chaining methods on Stylers:

   final style = BoxStyler()
       .color(Colors.blue)
       .size(100, 100)
       .paddingAll(16)
       .borderRounded(8);
   

3. Specs are immutable, Stylers are builders. Never construct a Spec directly — always use the corresponding Styler (BoxStyler, TextStyler, IconStyler).

4. Define styles as variables, not inline:

   // Correct
   final cardStyle = BoxStyler().color(Colors.white).paddingAll(16);
   Box(style: cardStyle, child: content);
   
   // Wrong — don't inline complex styles
   Box(style: BoxStyler().color(Colors.white).paddingAll(16), child: content);
   

5. Dart SDK >=3.11.0 — dot-shorthands are enabled (e.g., .center, .bold, .topLeft).

6. Stylers can be called directly to create their widget:

   final box = BoxStyler().color(Colors.blue).size(100, 100);
   // These are equivalent:
   Box(style: box);
   box();  // Shorthand — calls the styler to produce a Box
   

7. Factory constructors allow starting with a property:

   // These are equivalent:
   BoxStyler().color(Colors.blue)
   BoxStyler.color(Colors.blue)
   

Common Mistakes

Avoid these patterns — they are the most frequent errors:

Reference Routing

Before writing Mix code, read the relevant reference file(s) based on what the user needs. Load 1-2 references per request — don't load them all.

How to use references: Read the file with the Read tool, then follow the patterns and API tables in it. The references contain real, verified method signatures and code examples extracted from the Mix codebase.

Style Composition

Styles compose by merging — later values override earlier ones:

final base = BoxStyler()
    .paddingX(16)
    .paddingY(8)
    .borderRounded(8)
    .color(Colors.black);

// Override just the color — everything else carries over
final solid = base.color(Colors.blue);
final soft = base.color(Colors.blue.shade100);

Quick Reference: Widget ↔ Styler Mapping

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