dart3-idioms-and-coding-standards
Enforces which Dart 3 construct each declaration earns — sealed class + exhaustive switch with no `default:`/`case _:`, the three class modifiers (`sealed`/`final`/`abstract interface class`) and skip the rest, records as intra-layer tuples only, immutable value types (`final` fields, `const` ctor, value equality) hand-rolled when trivial and `freezed` when boilerplate dominates, explicit stable identity, total non-throwing domain functions, make-illegal-states-unrepresentable, and firm method/build/file/nesting complexity limits (the single-source-of-truth table other skills cite) — while banning `late`/`!`/`dynamic` honesty dodges. Use when authoring or reviewing any Dart type or declaration: class vs enum vs record vs typedef, hand-rolled vs `freezed`, adding a `switch`/`if-case`, writing `copyWith` or `==`/`hashCode`, deciding identity, keeping a domain function total, or hitting a length/nesting limit.
Install
With your agent
Install OMGSkills skill "zakariaf/flutter-skills:skills/dart3-idioms-and-coding-standards" into this agent's normal skills directory: call the OMGSkills MCP get_install_plan tool for your agent and run the script it returns (it installs only the pinned commit and verifies SKILL.md), and stop if MCP or the pin is unavailable. Do not overwrite or change existing skills without asking me.
Manual command
git clone https://github.com/zakariaf/Flutter-Skills /tmp/Flutter-Skills && ln -s /tmp/Flutter-Skills/skills/dart3-idioms-and-coding-standards ~/.claude/skills/dart3-idioms-and-coding-standardsFrom README
Dart 3 idioms and coding standards Modern Dart 3.x, value-type-first, total functions for domain logic. A language feature earns its place when it converts a runtime silence into a compile error; everything else is decoration. This skill governs how each declaration is typed, named, kept immutable, and kept total — the error-handling architecture that rides on top of these mechanics lives in error-handling-typed-results. Read the reference for the task at hand: references/construct-verdict-table.md — the feature-by-feature verdict table (sealed / enum / record / class modifiers / extension type / codegen packages), with the rationale for each Use / Skip. references/immutability-and-equality.md — immutable value types, copyWith, when to hand-write ==/hashCode, and stable-identity vs value-equality. references/complexity-and-honesty.md — the length/nesting limits with their evidence, and the late/!/dynamic honesty-dodge bans in full. Run scripts/check-dart3-idioms.sh before a PR.
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