1 files changed, 21 insertions, 6 deletions
diff --git a/lua/nvim-lsp-installer/installers/npm.lua b/lua/nvim-lsp-installer/installers/npm.lua
index 4900fba1..0988c82a 100644
--- a/lua/nvim-lsp-installer/installers/npm.lua
+++ b/lua/nvim-lsp-installer/installers/npm.lua
@@ -1,4 +1,6 @@
 local path = require "nvim-lsp-installer.path"
+local installers = require "nvim-lsp-installer.installers"
+local std = require "nvim-lsp-installer.installers.std"
 local platform = require "nvim-lsp-installer.platform"
 local process = require "nvim-lsp-installer.process"
 
@@ -6,34 +8,47 @@ local M = {}
 
 local npm = platform.is_win and "npm.cmd" or "npm"
 
+local function ensure_npm(installer)
+    return installers.pipe {
+        std.ensure_executables {
+            { "node", "node was not found in path. Refer to https://nodejs.org/en/." },
+            {
+                "npm",
+                "npm was not found in path. Refer to https://docs.npmjs.com/downloading-and-installing-node-js-and-npm.",
+            },
+        },
+        installer,
+    }
+end
+
 function M.packages(packages)
-    return function(server, callback, context)
+    return ensure_npm(function(server, callback, context)
         process.spawn(npm, {
             args = vim.list_extend({ "install" }, packages),
             cwd = server.root_dir,
             stdio_sink = context.stdio_sink,
         }, callback)
-    end
+    end)
 end
 
 function M.install(production)
-    return function(server, callback, context)
+    return ensure_npm(function(server, callback, context)
         process.spawn(npm, {
             args = production and { "install", "--production" } or { "install" },
             cwd = server.root_dir,
             stdio_sink = context.stdio_sink,
         }, callback)
-    end
+    end)
 end
 
 function M.run(script)
-    return function(server, callback, context)
+    return ensure_npm(function(server, callback, context)
         process.spawn(npm, {
             args = { "run", script },
             cwd = server.root_dir,
             stdio_sink = context.stdio_sink,
         }, callback)
-    end
+    end)
 end
 
 function M.executable(root_dir, executable)