code-style

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Code style rules for IntelliJ codebase. Use when writing or reviewing code for style compliance.

JetBrains By JetBrains schedule Updated 2/10/2026

name: code-style description: Code style rules for IntelliJ codebase. Use when writing or reviewing code for style compliance.

Code Style

Follow the IntelliJ Coding Guidelines with these IntelliJ-specific rules.

Language

  • ALWAYS use Kotlin for new files - Only use Java when modifying existing Java code
  • Use idiomatic Kotlin: extension functions, data classes, null safety
  • Mark experimental APIs with @ApiStatus.Experimental
  • Build scripts Kotlin style: Follow community/platform/build-scripts/kotlin-style-recommendations.md for build-scripts code:
    • Use @JvmField for internal data class fields
    • Use .put()/.get() instead of [] operator
    • Use explicit HashMap/HashSet/LinkedHashMap instead of mutableMapOf()/mutableSetOf()

Formatting

  • Indentation: 2 spaces (4 for Go files)
  • Line length: 140 characters max
  • Braces: else/catch/finally on new lines
  • Only in /rustrover directory you must always use standard Kotlin formatting rules with 4 spaces indentation.
Install via CLI
npx skills add https://github.com/JetBrains/intellij-community --skill code-style
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