feat(typescript): Rule "no-namespace"

Signed-off-by: Valentin Popov <info@valentineus.link>

ROADMAP.md

@@ -367,7 +367,7 @@
 - [X] "no-magic-numbers"
 - [ ] "no-misused-new"
 - [ ] "no-misused-promises"
-- [ ] "no-namespace"
+- [X] "no-namespace"
 - [ ] "no-non-null-asserted-optional-chain"
 - [ ] "no-non-null-assertion"
 - [ ] "no-parameter-properties"

src/rules/typescript/default.json

@@ -60,6 +60,13 @@
       "ignoreReadonlyClassProperties": true
     }
   ],
+  "@typescript-eslint/no-namespace": [
+    "error",
+    {
+      "allowDeclarations": true,
+      "allowDefinitionFiles": true
+    }
+  ],
   "@typescript-eslint/quotes": [
     "error",
     "double",