Store all built-in languages

While we want the CodeQL Action to work with third-party language support, having a list of all built-in languages can help us create better type-level checks to ensure that we don't miss things that we want to customize for each of our built-in languages.

lib/init-action-post.js

@@ -166466,6 +166466,36 @@ ${jsonContents}`
   }
 }
 
+// src/languages/builtin.json
+var builtin_default = {
+  languages: [
+    "actions",
+    "cpp",
+    "csharp",
+    "go",
+    "java",
+    "javascript",
+    "python",
+    "ruby",
+    "rust",
+    "swift"
+  ],
+  aliases: {
+    c: "cpp",
+    "c-c++": "cpp",
+    "c-cpp": "cpp",
+    "c#": "csharp",
+    "c++": "cpp",
+    "java-kotlin": "java",
+    "javascript-typescript": "javascript",
+    kotlin: "java",
+    typescript: "javascript"
+  }
+};
+
+// src/languages/index.ts
+var knownLanguageSet = new Set(builtin_default.languages);
+
 // src/overlay/status.ts
 var fs7 = __toESM(require("fs"));
 var path7 = __toESM(require("path"));