Kotlin Worksheet

Evaluate Kotlin worksheet files in VS Code.

Install from the Visual Studio Marketplace

Files ending in .worksheet.kts can be run with Kotlin Worksheet: Run. Use Run Selection or Run Current Block to evaluate focused code without disturbing unrelated results. Run-on-save is available as an optional setting.

val x = 40 // => 40
x + 2 // => 42
println("hello") // => hello

Requirements

• VS Code 1.100 or newer
• A local Kotlin compiler on PATH, or configure kotlinWorksheet.kotlinCommand
• Kotlin syntax highlighting from a Kotlin language extension. This extension packs fwcd.kotlin.

Supported Kotlin compiler for CI and local examples: kotlinc-jvm 2.4.0. Use kotlinWorksheet.executionMode to choose between local kotlinc, Gradle classpath resolution, or automatic detection. The current support baseline is VS Code 1.100+, Kotlin 2.4.0, and macOS, Linux, or Windows. See the support matrix for Gradle limitations.

Set Up Kotlin

Check whether the Kotlin compiler is available:

kotlinc -version

If the command is unavailable, install Kotlin with one of these options:

# macOS with Homebrew
brew install kotlin

# SDKMAN
sdk install kotlin

# mise
mise use --global kotlin@2.4.0

Restart VS Code after installing Kotlin so the extension can detect the updated PATH. If kotlinc is installed elsewhere, set its path in VS Code settings:

{
  "kotlinWorksheet.kotlinCommand": "/absolute/path/to/kotlinc"
}

Set kotlinc

• Run kotlinc -version and result must be like info: kotlinc-jvm 2.x.10 (JRE 2x.xxx)
• (If there is no kotlinc please install by using sdk install kotlin then check again
• Run which kotlinc and result should be like ${HOME}/.sdkman/candidates/kotlin/current/bin/kotlinc
• Copy and then paste kotlinc path into "Kotlin Worksheet: Kotlin Command" in plugin setting

Install For Users

Install from the Visual Studio Marketplace:

1. Open Kotlin Worksheet on the Visual Studio Marketplace.
2. Click Install.
3. Open a trusted workspace in VS Code.
4. Create a file ending in .worksheet.kts.
5. Run Kotlin Worksheet: Run.

Install from a local VSIX if you are testing an unreleased build:

1. Download or build kotlin-worksheet-0.6.0.vsix.
2. Open VS Code.
3. Run Extensions: Install from VSIX... from the Command Palette.
4. Select kotlin-worksheet-0.6.0.vsix.
5. Open a trusted workspace.
6. Create a file ending in .worksheet.kts.
7. Run Kotlin Worksheet: Run.

Install the Kotlin compiler if kotlinc -version does not work in your terminal. After installing Kotlin, restart VS Code so the extension can see the updated PATH.

Commands

• Kotlin Worksheet: Run
• Kotlin Worksheet: Run Selection
• Kotlin Worksheet: Run Current Block
• Kotlin Worksheet: Clear Results
• Kotlin Worksheet: New Worksheet
• Kotlin Worksheet: Toggle Run On Save
• Kotlin Worksheet: Toggle Render Mode
• Kotlin Worksheet: Check Environment
• Kotlin Worksheet: Show Log

Settings

• kotlinWorksheet.kotlinCommand: command used to run Kotlin scripts, default kotlinc
• kotlinWorksheet.runOnSave: run .worksheet.kts files on save, default false
• kotlinWorksheet.renderMode: show results as inlineComments or decorations, default inlineComments
• kotlinWorksheet.executionMode: choose auto, localKotlinc, or gradleClasspath, default auto
• kotlinWorksheet.timeoutMs: execution timeout in milliseconds, default 10000
• kotlinWorksheet.maxResultLength: maximum displayed result length, default 500

Support

If Kotlin Worksheet is useful to you, you can support its development on Buy Me a Coffee.

Development

pnpm install
pnpm compile
pnpm test

Run the full local verification before packaging or release:

pnpm check

Docs

• docs/user-guide.md
• docs/examples.md
• docs/architecture.md
• docs/development.md
• docs/publishing.md
• docs/production-readiness.md
• docs/roadmap-to-1.0.0.md
• docs/roadmap-0.5.0.md
• docs/ux-confidence-release.md
• CHANGELOG.md
• CONTRIBUTING.md