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# LSP Extensions
This document describes LSP extensions used by rust-analyzer.
It's a best effort document, when in doubt, consult the source (and send a PR with clarification ;-) ).
We aim to upstream all non Rust-specific extensions to the protocol, but this is not a top priority.
All capabilities are enabled via `experimental` field of `ClientCapabilities`.
## `SnippetTextEdit`
**Capability**
```typescript
{
"snippetTextEdit": boolean
}
```
If this capability is set, `WorkspaceEdit`s returned from `codeAction` requests might contain `SnippetTextEdit`s instead of usual `TextEdit`s:
```typescript
interface SnippetTextEdit extends TextEdit {
insertTextFormat?: InsertTextFormat;
}
```
```typescript
export interface TextDocumentEdit {
textDocument: VersionedTextDocumentIdentifier;
edits: (TextEdit | SnippetTextEdit)[];
}
```
When applying such code action, the editor should insert snippet, with tab stops and placeholder.
At the moment, rust-analyzer guarantees that only a single edit will have `InsertTextFormat.Snippet`.
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