ported the lua, port is complete, I think.

lua/plugins/preview/markdown.lua

@@ -0,0 +1,19 @@
+return {
+  "markdown-preview.nvim",
+  -- NOTE: for_cat is a custom handler that just sets enabled value for us,
+  -- based on result of nixCats('cat.name') and allows us to set a different default if we wish
+  -- it is defined in luaUtils template in lua/nixCatsUtils/lzUtils.lua
+  -- you could replace this with enabled = nixCats('cat.name') == true
+  -- if you didnt care to set a different default for when not using nix than the default you already set
+  for_cat = 'markdown',
+  cmd = { "MarkdownPreview", "MarkdownPreviewStop", "MarkdownPreviewToggle", },
+  ft = "markdown",
+  keys = {
+    { "<leader>Pmp", "<cmd>MarkdownPreview <CR>",       mode = { "n" }, noremap = true, desc = "markdown preview" },
+    { "<leader>Pms", "<cmd>MarkdownPreviewStop <CR>",   mode = { "n" }, noremap = true, desc = "markdown preview stop" },
+    { "<leader>Pmt", "<cmd>MarkdownPreviewToggle <CR>", mode = { "n" }, noremap = true, desc = "markdown preview toggle" },
+  },
+  before = function()
+    vim.g.mkdp_auto_close = 0
+  end,
+}

lua/plugins/preview/typst.lua

@@ -0,0 +1,14 @@
+return {
+  "typst-preview.nvim",
+  for_cat = "typst",
+  ft = "typst",
+  cmd = { "TypstPreview", "TypstPreviewStop", "TypstPreviewToggle", },
+  keys = {
+    { "<leader>ptp", "<cmd>TypstPreview <CR>",       mode = { "n" }, noremap = true, desc = "typst preview" },
+    { "<leader>pts", "<cmd>TypstPreviewStop <CR>",   mode = { "n" }, noremap = true, desc = "typst preview stop" },
+    { "<leader>ptt", "<cmd>TypstPreviewToggle <CR>", mode = { "n" }, noremap = true, desc = "typst preview toggle" },
+  },
+  after = function()
+    require('typst-preview').setup {}
+  end
+}