spec(teal_type_definition): test Variable node

spec/printer/teal_type_definition_spec.tl

@@ -17,7 +17,7 @@ local function gen(ast: Node, expected_code: string): function()
    end
 end
 
-describe("Print Teal type definition", function()
+describe("Teal type definition Printer", function()
    it("should print a simple module type definition", gen(
       {
          children = {},
@@ -66,4 +66,26 @@ describe("Print Teal type definition", function()
 
          return Signal_Module
       ]]))
+
+   it("should print a property exposed by the module", gen(
+      {
+         children = {
+            {
+               name = "text",
+               types = { "string", "nil" },
+               token = "variable",
+            }
+         },
+         name = "Property_Module",
+         token = "module",
+      },
+      [[
+         -- This file was auto-generated.
+
+         local record Property_Module
+            text: string | nil
+         end
+
+         return Property_Module
+      ]]))
 end)

src/awesomewm.d.tl/printer/teal_type_definition.tl

@@ -1,23 +1,16 @@
-local ast = require "ast"
-local logger = require "logger"
-local type Node = require "types.Node"
+local ast = require("ast")
+local logger = require("logger")
+local type Node = require("types.Node")
+local stringx = require("pl.stringx")
 
 local log = logger.log("scraper")
 
-local function concatenate_strings(strings: { string }): string
-   local result = ""
-   for _, str in ipairs(strings) do
-      result = result .. str
-   end
-   return result
-end
-
 local function render_types(types: { string }): string
    if not types or #types == 0 then
       return ""
    end
 
-   return ": " .. concatenate_strings(types)
+   return ": " .. stringx.join(" | ", types)
 end
 
 local record Node_Printer_Function