chore(master): release nvim-tree 1.19.0

* feat: restore buffers after loading a session

* feat(sessions): invalid json handling

* feat(sessions): switch to "persist in a file" strategy

* docs: no longer needs to toggle sessionoptions flag

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.18.0"
+  ".": "1.19.0"
 }

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [1.19.0](https://github.com/nvim-tree/nvim-tree.lua/compare/nvim-tree-v1.18.0...nvim-tree-v1.19.0) (2026-07-15)
+
+
+### Features
+
+* experiment: restore nvim-tree on session load, see https://github.com/nvim-tree/nvim-tree.lua/issues/3343 ([#3335](https://github.com/nvim-tree/nvim-tree.lua/issues/3335)) ([cf18a66](https://github.com/nvim-tree/nvim-tree.lua/commit/cf18a662cd5f200361b6fedfb794eed583e075e1))
+
+
+### Bug Fixes
+
+* **#3346:** api.tree.resize: 'configure_width' (a nil value) ([#3347](https://github.com/nvim-tree/nvim-tree.lua/issues/3347)) ([a797d5e](https://github.com/nvim-tree/nvim-tree.lua/commit/a797d5e20133fc031fba4aa7d1272f5b1d950a1c))
+
 ## [1.18.0](https://github.com/nvim-tree/nvim-tree.lua/compare/nvim-tree-v1.17.0...nvim-tree-v1.18.0) (2026-07-01)
 
 

README.md

@@ -15,7 +15,9 @@
 
    (Live) filtering
 
-   Cut, copy, paste, rename, delete, create
+   Rename, delete, create
+
+   Cut, copy, paste locally and between instances
 
    Highly customisable
 

doc/nvim-tree-lua.txt

@@ -1911,6 +1911,11 @@ Config: experimental                           *nvim-tree-config-experimental*
     In the event of a problem please disable the experiment and raise an
     issue.
 
+    Fields: ~
+      • {session_restore_nvim}?  (`boolean`, default: `false`) Restore
+                                 nvim-tree buffers when restoring vim sessions
+                                 (requires 0.13+).
+
 ==============================================================================
 Config: log                                             *nvim-tree-config-log*
 
@@ -2216,6 +2221,7 @@ Following is the default configuration, see |nvim_tree.config| for details. >lua
         persist = false,
       },
       experimental = {
+        session_restore_nvim = false
       },
       log = {
         enable = false,

lua/nvim-tree/_meta/config/experimental.lua

@@ -9,6 +9,9 @@ error("Cannot require a meta file")
 ---
 ---@class nvim_tree.config.experimental
 ---
+---Restore nvim-tree buffers when restoring vim sessions (requires 0.13+).
+---(default: `false`)
+---@field session_restore_nvim? boolean
 --Example below for future reference:
 --
 --Buffers opened by nvim-tree will use with relative paths instead of absolute.

lua/nvim-tree/actions/fs/create-file.lua

@@ -49,7 +49,7 @@ function M.fn(node)
   local containing_folder = utils.path_add_trailing(dir.absolute_path)
 
   local input_opts = {
-    prompt = "Create file ",
+    prompt = "Create ",
     default = containing_folder,
     completion = "file",
   }

lua/nvim-tree/actions/tree/resize.lua

@@ -1,4 +1,5 @@
 local view = require("nvim-tree.view")
+local view_state = require("nvim-tree.view-state")
 
 local M = {}
 
@@ -7,7 +8,7 @@ local M = {}
 function M.fn(opts)
   if opts == nil then
     -- reset to config values
-    view.configure_width()
+    view_state.configure_width()
     view.resize()
     return
   end
@@ -16,7 +17,7 @@ function M.fn(opts)
   local width_cfg = options.width
 
   if width_cfg ~= nil then
-    view.configure_width(width_cfg)
+    view_state.configure_width(width_cfg)
     view.resize()
     return
   end

lua/nvim-tree/autocmd.lua

@@ -17,6 +17,28 @@ function M.global()
     end,
   })
 
+  if vim.fn.has("nvim-0.13") == 1 and config.g.experimental.session_restore_nvim then
+    vim.api.nvim_create_autocmd("SessionWritePre", { ---@diagnostic disable-line: param-type-mismatch
+      group = augroup_id,
+      callback = function()
+        -- We must schedule to wait until `vim.v.this_session` is properly updated
+        -- This prevents overwriting the data if a new session is created with a new `:mksession`
+        vim.schedule(require("nvim-tree.session").save)
+      end,
+    })
+
+    vim.api.nvim_create_autocmd("SessionLoadPost", {
+      group = augroup_id,
+      -- Workaround: this event fires multiple times (report upstream),
+      -- failure notifications could show up many times.
+      once = true,
+      callback = function()
+        require("nvim-tree.session").restore()
+      end,
+    })
+  end
+
+
   if config.g.tab.sync.open then
     vim.api.nvim_create_autocmd("TabEnter", {
       group = augroup_id,

lua/nvim-tree/config.lua

@@ -297,6 +297,7 @@ M.d = { -- config-default-start
     persist = false,
   },
   experimental = {
+    session_restore_nvim = false
   },
   log = {
     enable = false,

lua/nvim-tree/session.lua

@@ -0,0 +1,103 @@
+local notify = require("nvim-tree.notify")
+
+local M = {}
+
+local storepath = vim.fn.stdpath("data") .. "/nvim-tree-session.json"
+
+local function decode_session_file()
+  local file = io.open(storepath, "r")
+
+  if file then
+    local content = file:read("*all")
+    file:close()
+    if content and content ~= "" then
+      return vim.json.decode(content)
+    end
+  end
+  -- Notifying on failure could be noisy, as it'd happen if the file simply did not exist
+end
+
+local function write_session_file(session_file_content)
+  local file, errmsg = io.open(storepath, "w")
+
+  if file then
+    file:write(vim.json.encode(session_file_content))
+    file:close()
+  else
+    notify.warn(string.format("Invalid session file (%s): %s", storepath, errmsg))
+  end
+end
+
+function M.save()
+  -- We either always save the session data, which ends up populating the storepath with empty data
+  -- Or we gate by the tree's visibility, which could create "out of sync" scenario:
+  -- if the tree is initially open and the session is saved, it won't be overridden later,
+  -- if the tree is no longer visible. However, when restoring, this is harmless.
+  if require("nvim-tree.api").tree.is_visible({ any_tabpage = true }) then
+    local ok, session_file_content = pcall(decode_session_file)
+
+    if not ok then
+      notify.warn(string.format("Failed to decode session file (%s): %s", storepath, session_file_content))
+      return
+    end
+
+    -- might be nil at this point
+    session_file_content = session_file_content or {}
+
+    local cwd = require("nvim-tree.core").get_cwd()
+
+    session_file_content[vim.v.this_session] = { cwd = cwd }
+
+    local ok2, err = pcall(write_session_file, session_file_content)
+
+    if not ok2 then
+      notify.warn(string.format("Failed to write session file (%s): %s", storepath, err))
+    end
+  end
+end
+
+function M.restore()
+  local api = require("nvim-tree.api").tree
+
+  ---@type table<integer,boolean>
+  local tabs = {}
+
+  local ok, session_file_content = pcall(decode_session_file)
+
+  -- Failing to restore cwd is not fatal, we can continue
+  if not ok then
+    notify.warn(string.format("Failed to decode session file (%s): %s", storepath, session_file_content))
+  end
+
+  local path = session_file_content and session_file_content[vim.v.this_session] and session_file_content[vim.v.this_session].cwd or nil
+
+  -- Save tabs with leftover nvim-tree buffers
+  for _, tab in ipairs(vim.api.nvim_list_tabpages()) do
+    for _, win in ipairs(vim.api.nvim_tabpage_list_wins(tab)) do
+      local buf = vim.api.nvim_win_get_buf(win)
+      if api.is_tree_buf(buf) then
+        tabs[tab] = true
+      end
+    end
+  end
+
+  -- The new window may inherit options from the current one if we don't schedule
+  vim.schedule(function()
+    api.close_in_all_tabs()
+
+    for tab, _ in pairs(tabs) do
+      if vim.api.nvim_tabpage_is_valid(tab) then
+        local win = vim.api.nvim_tabpage_get_win(tab)
+
+        -- Invoke `open` from each tab's current window to prevent having to switch tabs
+        if vim.api.nvim_win_is_valid(win) then
+          vim.api.nvim_win_call(win, function()
+            api.open({ path = path })
+          end)
+        end
+      end
+    end
+  end)
+end
+
+return M

lua/nvim-tree/view-state.lua

@@ -71,7 +71,7 @@ end
 
 ---Configure width-related config
 ---@param width string|function|number|table|nil
-local function configure_width(width)
+function M.configure_width(width)
   if type(width) == "table" then
     M.Active.adaptive_size = true
     M.Active.width = width.min or DEFAULT_MIN_WIDTH
@@ -101,7 +101,7 @@ function M.initialize()
   M.Active.winopts.relativenumber = config.g.view.relativenumber
   M.Active.winopts.signcolumn = config.g.view.signcolumn
 
-  configure_width(config.g.view.width)
+  M.configure_width(config.g.view.width)
 
   M.Active.initial_width = M.get_width()
 end

lua/nvim-tree/view.lua

@@ -298,7 +298,7 @@ function M.resize(size)
   local new_size = view_state.get_width()
 
   if new_size ~= vim.api.nvim_win_get_width(winnr) then
-    vim.api.nvim_win_set_width(winnr, new_size)
+    vim.api.nvim_win_set_width(winnr, new_size) ---@diagnostic disable-line: deprecated see #3344
     if not config.g.view.preserve_window_proportions then
       vim.cmd(":wincmd =")
     end