3 files changed, 11 insertions, 1 deletions

diff --git a/editors/code/package.json b/editors/code/package.json
index 05c808394..c2ed8d126 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -232,6 +232,11 @@
                     ],
                     "default": "off",
                     "description": "Trace output of cargo-watch"
+                },
+                "rust-analyzer.lruCapacity": {
+                    "type": "number",
+                    "default": null,
+                    "description": "Number of syntax trees rust-analyzer keeps in memory"
                 }
             }
         },
diff --git a/editors/code/src/config.ts b/editors/code/src/config.ts
index 8d73a6b34..3024546d2 100644
--- a/editors/code/src/config.ts
+++ b/editors/code/src/config.ts
@@ -19,6 +19,7 @@ export class Config {
     public enableEnhancedTyping = true;
     public raLspServerPath = RA_LSP_DEBUG || 'ra_lsp_server';
     public showWorkspaceLoadedNotification = true;
+    public lruCapacity: null | number = null;
     public cargoWatchOptions: CargoWatchOptions = {
         enableOnStartup: 'ask',
         trace: 'off',
@@ -109,5 +110,8 @@ export class Config {
                 ''
             );
         }
+        if (config.has('lruCapacity')) {
+            this.lruCapacity = config.get('lruCapacity') as number;
+        }
     }
 }
diff --git a/editors/code/src/server.ts b/editors/code/src/server.ts
index 81c2b3fff..7029142fd 100644
--- a/editors/code/src/server.ts
+++ b/editors/code/src/server.ts
@@ -35,7 +35,8 @@ export class Server {
             initializationOptions: {
                 publishDecorations: true,
                 showWorkspaceLoaded:
-                    Server.config.showWorkspaceLoadedNotification
+                    Server.config.showWorkspaceLoadedNotification,
+                lruCapacity: Server.config.lruCapacity
             },
             traceOutputChannel
         };