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kotlin-types-value-class

Identify when to replace single-field Kotlin wrappers with @JvmInline value classes.

1|Updated Apr 2, 2026
Search Tags:#type-safety#kotlin#serialization#compose#inline#data-class#value-class
One-click install
npx skills add https://github.com/leogallego/ansible-jane --skill kotlin-types-value-class-leogallego
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Skill: kotlin-types-value-class
Source: https://github.com/leogallego/ansible-jane/tree/main/skills/kotlin-types-value-class
Command: npx skills add https://github.com/leogallego/ansible-jane --skill kotlin-types-value-class-leogallego

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Prefer @JvmInline value classes for single-field domain types to provide compile-time type safety without the allocation overhead of data classes.

Core Features & Use Cases

  • Guidance on when to use value classes vs data classes for domain types.
  • Decision flow to evaluate single-field wrappers, domain meaning, and performance implications.
  • Compose stability and serialization considerations to avoid breaking changes across Kotlin projects.

Quick Start

Identify a single-field Kotlin type and replace its wrapper with an @JvmInline value class to ensure type safety without allocations.

Frequently Asked Questions about kotlin-types-value-class

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
When should I use an inline value class instead of a data class in Kotlin?▼

Value classes are preferred over data classes when wrapping a single field to enforce domain meaning. This approach provides compile-time type safety while ensuring zero allocation overhead at runtime.

How do Kotlin value classes affect Jetpack Compose stability?▼

Kotlin value classes maintain Compose stability because their underlying primitive values are stable. Using @JvmInline wrappers for domain types ensures they do not trigger unnecessary recompositions.

Does autoboxing apply to @JvmInline value classes?▼

Autoboxing considerations apply to @JvmInline value classes when used in nullable contexts or generic collections. While generally zero-allocation, boxing occurs to preserve type-safety when wrapped values require object representation.

How do I serialize Kotlin value classes on the JVM?▼

Kotlin/JVM serialization handles value classes by serializing their underlying wrapped property. You must ensure compatibility with common Kotlin projects by configuring serializers to handle the single-field @JvmInline structure correctly.

What are the limitations of using inline value classes for type-safety?▼

Limitations of inline value classes include autoboxing in generic collections and potential serialization complexities. You should evaluate single-field wrappers carefully to avoid breaking changes across Kotlin projects.

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