feat(linter/no-base-to-string): add checkUnknown option

apps/oxlint/fixtures/tsgolint_rule_options/.oxlintrc.json

@@ -12,6 +12,7 @@
     "typescript/no-base-to-string": [
       "error",
       {
+        "checkUnknown": true,
         "ignoredTypeNames": ["Error", "RegExp", "URL", "URLSearchParams", "CustomStringifiable"]
       }
     ],

apps/oxlint/fixtures/tsgolint_rule_options/test.ts

@@ -57,4 +57,9 @@ const optionalAccess = anyValue?.foo;
 // This SHOULD error because it's not using optional chaining
 const unsafeAccess = anyValue.bar;
 
-export { result, customStr, allowedSpread, notAllowedSpread, literalConst, optionalAccess, unsafeAccess };
+// Test no-base-to-string with checkUnknown option
+declare const unknownValue: unknown;
+// This SHOULD error because checkUnknown is true
+const unknownStr = unknownValue.toString();
+
+export { result, customStr, allowedSpread, notAllowedSpread, literalConst, optionalAccess, unsafeAccess, unknownStr };

apps/oxlint/src/snapshots/fixtures__tsgolint_rule_options_--type-aware@oxlint.snap

@@ -30,7 +30,15 @@ working directory: fixtures/tsgolint_rule_options
  59 | 
     `----
 
-Found 0 warnings and 3 errors.
+  x typescript-eslint(no-base-to-string): 'unknownValue' may use Object's default stringification format ('[object Object]') when stringified.
+    ,-[test.ts:63:20]
+ 62 | // This SHOULD error because checkUnknown is true
+ 63 | const unknownStr = unknownValue.toString();
+    :                    ^^^^^^^^^^^^
+ 64 | 
+    `----
+
+Found 0 warnings and 4 errors.
 Finished in <variable>ms on 1 file using 1 threads.
 ----------
 CLI result: LintFoundErrors

crates/oxc_linter/src/rules/typescript/no_base_to_string.rs

@@ -10,6 +10,11 @@ pub struct NoBaseToString(Box<NoBaseToStringConfig>);
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
 #[serde(rename_all = "camelCase", default)]
 pub struct NoBaseToStringConfig {
+    /// Whether to also check values of type `unknown`.
+    /// When `true`, calling toString on `unknown` values will be flagged.
+    /// Default is `false`.
+    pub check_unknown: bool,
+
     /// A list of type names to ignore when checking for unsafe toString usage.
     /// These types are considered safe to call toString on even if they don't
     /// provide a custom implementation.
@@ -19,6 +24,7 @@ pub struct NoBaseToStringConfig {
 impl Default for NoBaseToStringConfig {
     fn default() -> Self {
         Self {
+            check_unknown: false,
             ignored_type_names: vec![
                 "Error".to_string(),
                 "RegExp".to_string(),