diff --git a/plugins/by-name/treesitter/injections.scm b/plugins/by-name/treesitter/injections.scm
index e568bc03..697a0299 100644
--- a/plugins/by-name/treesitter/injections.scm
+++ b/plugins/by-name/treesitter/injections.scm
@@ -59,6 +59,13 @@
       (string_expression (string_fragment) @injection.content)
       (indented_string_expression (string_fragment) @injection.content)
     ])
+
+    ; Let expressions
+    ; extraConfigLua = let x = ...; in ''...''
+    (let_expression body: [
+      (string_expression (string_fragment) @injection.content)
+      (indented_string_expression (string_fragment) @injection.content)
+    ])
   ]
   (#any-of? @_path "__raw" "extraConfigLua" "extraConfigLuaPre" "extraConfigLuaPost")
   (#set! injection.language "lua"))
@@ -97,6 +104,13 @@
           (string_expression (string_fragment) @injection.content)
           (indented_string_expression (string_fragment) @injection.content)
         ])))))
+
+      ; Let expressions
+      ; luaConfig = { pre = let x = ...; in ''...'' }
+      (let_expression body: [
+        (string_expression (string_fragment) @injection.content)
+        (indented_string_expression (string_fragment) @injection.content)
+      ])
     ]
     (#any-of? @_nested "pre" "post" "content")
   )))
@@ -134,6 +148,13 @@
         (string_expression (string_fragment) @injection.content)
         (indented_string_expression (string_fragment) @injection.content)
       ])))))
+
+    ; Let expressions
+    ; luaConfig.pre = let x = ...; in ''...''
+    (let_expression body: [
+      (string_expression (string_fragment) @injection.content)
+      (indented_string_expression (string_fragment) @injection.content)
+    ])
   ]
   (#eq? @ns "luaConfig")
   (#any-of? @name "pre" "post" "content")
@@ -182,6 +203,13 @@
          (indented_string_expression (string_fragment) @injection.content)
       ]))
     ]))
+
+    ; Let expressions
+    ; extraConfigVim = let x = ...; in ''...''
+    (let_expression body: [
+      (string_expression (string_fragment) @injection.content)
+      (indented_string_expression (string_fragment) @injection.content)
+    ])
   ]
   (#any-of? @_path "extraConfigVim" "extraConfigVimPre" "extraConfigVimPost")
   (#set! injection.language "vim"))
diff --git a/plugins/by-name/treesitter/test-injections.nix b/plugins/by-name/treesitter/test-injections.nix
index ca9c633e..b990df3a 100644
--- a/plugins/by-name/treesitter/test-injections.nix
+++ b/plugins/by-name/treesitter/test-injections.nix
@@ -228,4 +228,69 @@ in
       };
     };
   };
+
+  # ============================================================================
+  # SECTION 10: Let expressions
+  # ============================================================================
+  section10 = {
+    # Basic let expression with extraConfigLua
+    extraConfigLua =
+      let
+        configPath = "${pkgs.neovim}/share/nvim";
+      in
+      ''
+        local config_path = "${configPath}"
+        vim.opt.runtimepath:append(config_path)
+      '';
+
+    # Let expression with luaConfig nested attrset
+    luaConfig = {
+      pre =
+        let
+          pluginPath = "${pkgs.vimPlugins.telescope-nvim}";
+        in
+        ''
+          vim.g.telescope_path = "${pluginPath}"
+        '';
+    };
+
+    # Let expression with dot notation
+    luaConfig.post =
+      let
+        java-debug = "${pkgs.vscode-extensions.vscjava.vscode-java-debug}/share/vscode/extensions/vscjava.vscode-java-debug/server";
+        java-test = "${pkgs.vscode-extensions.vscjava.vscode-java-test}/share/vscode/extensions/vscjava.vscode-java-test/server";
+      in
+      ''
+        local jdtls = require("jdtls")
+        local jdtls_dap = require("jdtls.dap")
+        local jdtls_setup = require("jdtls.setup")
+
+        _M.jdtls = {}
+        _M.jdtls.bundles = {}
+
+        local java_debug_bundle = vim.split(vim.fn.glob("${java-debug}" .. "/*.jar"), "\n")
+        local java_test_bundle = vim.split(vim.fn.glob("${java-test}" .. "/*.jar", true), "\n")
+
+        -- add jars to the bundle list if there are any
+        if java_debug_bundle[1] ~= "" then
+            vim.list_extend(_M.jdtls.bundles, java_debug_bundle)
+        end
+
+        if java_test_bundle[1] ~= "" then
+            vim.list_extend(_M.jdtls.bundles, java_test_bundle)
+        end
+      '';
+  };
+
+  # Let expression with vim config
+  section11 = {
+    extraConfigVim =
+      let
+        customPath = "/custom/vim/config";
+      in
+      ''
+        set runtimepath+=${customPath}
+        let g:custom_path = '${customPath}'
+      '';
+  };
 }