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.

Author: henrymercer

.github/workflows/update-bundle.yml

@@ -63,13 +63,58 @@ jobs:
         with:
           tools: https://github.com/github/codeql-action/releases/download/${{ github.event.release.tag_name }}/codeql-bundle-linux64.tar.gz
 
-      - name: Update language aliases
+      - name: Update known languages
+        uses: actions/github-script@v8
         env:
           CODEQL_PATH: ${{ steps.setup-codeql.outputs.codeql-path }}
-        run: |
-          "$CODEQL_PATH" resolve languages --format=betterjson --extractor-include-aliases \
-            | jq -S '.aliases // {}' \
-            > src/known-language-aliases.json
+        with:
+          script: |
+            const { execFileSync } = require("node:child_process");
+            const fs = require("node:fs");
+            const path = require("node:path");
+
+            const knownLanguages = [
+              "actions",
+              "cpp",
+              "csharp",
+              "go",
+              "java",
+              "javascript",
+              "python",
+              "ruby",
+              "rust",
+              "swift",
+            ];
+
+            const resolveOutput = JSON.parse(
+              execFileSync(
+                process.env.CODEQL_PATH,
+                [
+                  "resolve",
+                  "languages",
+                  "--format=betterjson",
+                  "--extractor-include-aliases",
+                ],
+                { encoding: "utf8" },
+              ),
+            );
+
+            const aliases = Object.fromEntries(
+              Object.entries(resolveOutput.aliases ?? {})
+                .filter(([, target]) => knownLanguages.includes(target))
+                .sort(([left], [right]) => left.localeCompare(right)),
+            );
+
+            const outputDir = path.join(
+              process.env.GITHUB_WORKSPACE,
+              "src",
+              "languages",
+            );
+            fs.mkdirSync(outputDir, { recursive: true });
+            fs.writeFileSync(
+              path.join(outputDir, "builtin.json"),
+              `${JSON.stringify({ languages: knownLanguages, aliases }, null, 2)}\n`,
+            );
 
       - name: Bump Action minor version if new CodeQL minor version series
         id: bump-action-version