Check whether a rule is array object or not on ban-types converter

Author: moznion

src/rules/converters/ban-types.ts

@@ -8,6 +8,10 @@ export const convertBanTypes: RuleConverter = tslintRule => {
     const bannedTypes: Record<string, ConvertBanTypeArgument | null> = {};
 
     for (const rule of tslintRule.ruleArguments) {
+        if (!Array.isArray(rule)) {
+            break;
+        }
+
         const [bannedType, message] = rule;
         if (!bannedType) {
             break;

src/rules/converters/tests/ban-types.test.ts

@@ -69,4 +69,18 @@ describe(convertBanTypes, () => {
             ],
         });
     });
+
+    test("conversion with duplicated arguments", () => {
+        const result = convertBanTypes({
+            ruleArguments: ["!!!this-is-not-array!!!"],
+        });
+
+        expect(result).toEqual({
+            rules: [
+                {
+                    ruleName: "@typescript-eslint/ban-types",
+                },
+            ],
+        });
+    });
 });