Language support for Unreal Angelscript (the Angelscript dialect used by the
Unreal Engine Angelscript plugin), backed
by a tree-sitter grammar and a Rust language server (as-lsp).
Features
Hover — types and documentation for symbols
Completion — keywords, indexed symbols, members
Signature help — parameter info for calls
Go to definition / References / Rename
Document symbols — outline view
Semantic tokens — full semantic highlighting (types, namespaces, fields, …)
Inlay hints
Diagnostics — syntax errors from the tree-sitter grammar plus semantic
diagnostics from the index
.d.as type declaration indexing — reads UE's exported type
declarations (Saved/AS-Cache, produced by the AngelscriptTypeExporter) and
watches them for changes
Requirements
A UE project exporting .d.as declarations via the Angelscript plugin's
type exporter (the default typeDeclarationDirs points at
${workspaceFolder}/Saved/AS-Cache).
Extension Settings
Setting
Default
Description
myAngelScriptLsp.serverPath
""
Absolute path to the as-lsp executable. When empty, the bundled server/as-lsp(.exe) is used (production) or cargo run -p as-lsp (dev).
myAngelScriptLsp.typeDeclarationDirs
["${workspaceFolder}/Saved/AS-Cache"]
.d.as type declaration directories. Supports ${workspaceFolder}.
myAngelScriptLsp.scriptRoots
[]
.as script search roots; empty = all workspace roots.
myAngelScriptLsp.floatIsFloat64
true
Mirror of the engine setting bScriptFloatIsFloat64. Must be kept in sync if you changed it in DefaultEngine.ini — a mismatch is a silent type-width error.
myAngelScriptLsp.debug.fileLog
false
Write server debug logs to .vscode/my-as-lsp.log in the workspace.
# extension: compile / watch (esbuild)
npm run compile
# package a host-platform .vsix (server binary must be built first)
cargo build --release -p as-lsp # in ../lsp
npm run package
# build + publish the current platform to the Marketplace
npm run release
The language server lives in lsp/ (Rust workspace:
as-syntax / as-core / as-lsp / as-cli); the tree-sitter grammar lives
in grammar/.
