Implement fetching, filtering and tests

.eslintrc.json

@@ -18,7 +18,7 @@
       "@typescript-eslint/await-thenable": "error",
       "@typescript-eslint/ban-ts-ignore": "error",
       "camelcase": "off",
-      "@typescript-eslint/camelcase": "error",
+      "@typescript-eslint/camelcase": "off",
       "@typescript-eslint/class-name-casing": "error",
       "@typescript-eslint/explicit-function-return-type": ["error", {"allowExpressions": true}],
       "@typescript-eslint/func-call-spacing": ["error", "never"],