<script lang="scala"> is highlighted as Scala, <style> as CSS.
In <template>, the HTML is highlighted, and these parts are highlighted as Scala:
{{ expr }}
v-if / v-else-if / v-show / v-model / v-for
:attr="expr" / v-bind:attr="expr"
@event.modifier="stmt" / v-on:event="stmt"
Tags starting with an uppercase letter (child components) are highlighted separately.
In the script, a triple-quoted string after a // language=scala / html / css comment is highlighted in that language.
Scala highlighting uses the Scala Syntax (official)
extension, which is installed automatically.
Language server
The Scala parts of .st files get these features from the Scalactive language server:
Completion, including classes that are not imported yet (an import is added to the <script>).
In the HTML part of the template: component names, props, events and v-model of child components, directives,
slot names, and standard HTML tags, attributes and enumerated values.
Type errors and other diagnostics, reported at their position in the .st file.
Hover with types and documentation, and signature help.
Go to definition: within the .st file, to .scala / .st files of the project, and into library sources.
From a child component's tag or attribute, it goes to the Props of that .st file.
Find references and rename (F2) of child component props.
Inspections of child component tags (unknown props and slots, missing required props) with quick fixes.
Inlay hints for inferred types.
Document formatting (template indentation, <style> rules, and scalafmt for <script>).
Requirements
An sbt project that enables ScalactivePlugin. Run sbt compile once so that target/scalactive-lsp.json
(the classpath and other settings for the language server) is written.
If it is missing, a notification offers to run sbt compile.
Java 11 or later. The extension looks at scalactive.languageServer.javaHome, JAVA_HOME and PATH in this order.
On first use, the language server downloads the Scala 3 presentation compiler for the project's Scala version
from Maven Central. Definitions in other files are read from the last sbt compilation.
Settings
Setting
Default
Description
scalactive.languageServer.enabled
true
Use the language server
scalactive.languageServer.javaHome
""
JDK to run the language server
scalactive.languageServer.jvmOptions
["-Xss4m", "-Xmx2G"]
JVM options for the language server
scalactive.trace.server
off
Trace the communication with the language server
Commands
Scalactive: New Scalactive Component (also in the Explorer's context menu) creates a .st file from a template.
Scalactive: Open Generated Scala Source opens the Scala code generated from the current .st file.
