Deploy main 5e572ce to prod (#198)

main's tree, with next merged on 26 October, as one commit onto prod, on sneak's order.

Model: opus-5-5
Co-authored-by: clawbot <clawbot@noreply.example.org>

eslint.config.js

@@ -0,0 +1,27 @@
+// eslint's recommended rules over every JavaScript file in the repo.
+// make lint runs it, in the frontend-lint stage of Dockerfile.
+import js from "@eslint/js";
+import globals from "globals";
+import { defineConfig } from "eslint/config";
+
+export default defineConfig([
+    js.configs.recommended,
+    {
+        // The page, and facts.js, which the viewport test runs inside it.
+        files: ["web/src/**/*.js", "test/viewport/facts.js"],
+        languageOptions: {
+            globals: {
+                ...globals.browser,
+                // vite.config.js defines these when it builds the page.
+                __COMMIT_HASH__: "readonly",
+                __COMMIT_FULL__: "readonly",
+            },
+        },
+    },
+    {
+        // Run by node: the tests, the viewport harness and these configs.
+        files: ["test/**/*.js", "*.js"],
+        ignores: ["test/viewport/facts.js"],
+        languageOptions: { globals: globals.node },
+    },
+]);