fix truncated JSON output with JSON reporter (#512)

* fix truncated JSON output with JSON reporter

* add comment

* output newline for JSON reporter

Author: refractalize

packages/knip/src/reporters/json.ts

@@ -93,10 +93,13 @@ export default async ({ report, issues, options }: ReporterOptions) => {
     }
   }
 
-  console.log(
-    JSON.stringify({
-      files: Array.from(issues.files).map(filePath => relative(filePath)),
-      issues: Object.values(json),
-    })
-  );
+  const output = JSON.stringify({
+    files: Array.from(issues.files).map(filePath => relative(filePath)),
+    issues: Object.values(json),
+  });
+
+  // See: https://github.com/nodejs/node/issues/6379
+  // @ts-expect-error _handle is private
+  process.stdout._handle?.setBlocking?.(true);
+  process.stdout.write(output + '\n');
 };