improving startup time by using lazy loading or filetype loading

lua/custom/plugins/snippets.lua

@@ -0,0 +1,36 @@
+return {
+  {
+    'L3MON4D3/LuaSnip',
+    -- follow latest release.
+    version = 'v2.*', -- Replace <CurrentMajor> by the latest released major (first number of latest release)
+    -- install jsregexp (optional!).
+    build = 'make install_jsregexp',
+
+    dependencies = { 'rafamadriz/friendly-snippets' },
+
+    config = function()
+      local ls = require('luasnip')
+      ls.filetype_extend('javascript', { 'jsdoc' })
+      ls.filetype_extend('python', { 'google' })
+
+      --- TODO: What is expand?
+      vim.keymap.set({ 'i' }, '<C-s>e', function()
+        ls.expand()
+      end, { silent = true })
+
+      vim.keymap.set({ 'i', 's' }, '<C-s>;', function()
+        ls.jump(1)
+      end, { silent = true })
+      vim.keymap.set({ 'i', 's' }, '<C-s>,', function()
+        ls.jump(-1)
+      end, { silent = true })
+
+      vim.keymap.set({ 'i', 's' }, '<C-s>', function()
+        if ls.choice_active() then
+          ls.change_choice(1)
+        end
+      end, { silent = true })
+    end,
+  },
+}
+