code-style
Apply IntelliJ Kotlin and Java code style when writing or reviewing.
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- JetBrains/intellij-community
- Last source activity
- August 5, 2026 at 18:20
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- code-style
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- Apply IntelliJ Kotlin and Java code style when writing or reviewing.
# 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.
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