Fix: Replace Infinity with Number.MAX_SAFE_INTEGER (fixes #13427) (#13435)

Author: nzakas

lib/cli-engine/config-array-factory.js

@@ -722,7 +722,12 @@ class ConfigArrayFactory {
          *
          * Refer https://github.com/eslint/eslint/issues/12592
          */
-        const clonedRulesConfig = rules && JSON.parse(JSON.stringify((rules)));
+        const clonedRulesConfig = rules && JSON.parse(
+            JSON.stringify(
+                rules,
+                (key, value) => (value === Infinity ? Number.MAX_SAFE_INTEGER : value)
+            )
+        );
 
         // Flatten `extends`.
         for (const extendName of extendList.filter(Boolean)) {

tests/fixtures/config-file/cloned-config/configWithInfinity.js

@@ -0,0 +1,6 @@
+module.exports = {
+
+  rules: {
+      "max-len": [ "error", { code: Infinity }]
+  }
+};

tests/lib/cli.js

@@ -1172,9 +1172,7 @@ describe("cli", () => {
 
                 assert.strictEqual(exit, 0);
             });
-        });
 
-        describe("config file and input file", () => {
             it("should exit with 1 as camelcase has wrong property type", async () => {
                 const configPath = getFixturePath("config-file", "cloned-config", "eslintConfigFail.js");
                 const filePath = getFixturePath("config-file", "cloned-config", "index.js");
@@ -1187,6 +1185,16 @@ describe("cli", () => {
                 }
 
             });
+
+            it("should not cause an error when a rule configuration has `Infinity`", async () => {
+                const configPath = getFixturePath("config-file", "cloned-config", "configWithInfinity.js");
+                const filePath = getFixturePath("config-file", "cloned-config", "index.js");
+                const args = `--config ${configPath} ${filePath}`;
+
+                const exit = await cli.execute(args);
+
+                assert.strictEqual(exit, 0);
+            });
         });
 
         describe("inline config and input file", () => {