Add ESLint support too

.eslintrc.js

@@ -0,0 +1,35 @@
+module.exports = {
+    plugins: [
+        "matrix-org",
+    ],
+    extends: [
+        "plugin:matrix-org/react",
+        "plugin:matrix-org/a11y",
+        "prettier",
+    ],
+    env: {
+        browser: true,
+        node: true,
+    },
+    parserOptions: {
+        "ecmaVersion": "latest",
+        "sourceType": "module",
+    },
+    rules: {
+        // We break this rule in a few places: dial it back to a warning
+        // (and run with max warnings) to tolerate the existing code
+        "react-hooks/exhaustive-deps": ["warn"],
+    },
+    overrides: [
+        {
+            files: [
+                "src/**/*.{ts,tsx}",
+            ],
+        },
+    ],
+    settings: {
+        react: {
+            version: "detect",
+        },
+    },
+};