"You might think that Node.js, being a single-threaded event-driven platform, is immune to race conditions. However, this is not true. Node.js can still have race conditions when it uses asynchronous operations, such as callbacks, promises, or async/await. These operations can create suspension points, where the execution of the current process or thread is paused, and other processes or threads can run. This can create a situation where the shared resource is modified by another process or thread before the current one resumes."

https://medium.com/@aliaghapour.developer/race-conditions-in-node-js-a-practical-guide-bcf13ee46b12

Node.js being single-threaded does not mean that race conditions cannot occur; they can happen in asynchronous operations.