Understanding QueueMicroTask In React Source Code
React uses queueMicroTask in ReactAct.js to apply pending updates before assertions. queueMicroTask queues a microtask to run after the current task, ensuring code runs without interfering with other pending tasks.
In this article, we analyze queueMicroTask function in React source code
React uses queueMicroTask in a file named ReactAct.js. This is a public API, act.
act is a test helper to apply pending React updates before making assertions.
await act(async actFn)
ReactAct.js has a lot of code, let’s narrow down our focus on to queueMicroTask.
Where is queueMicroTask called in ReactAct.js?
queueSeveralMicrotasks is found at the end of this ReactAct.js file and calls queueMicroTask with a callback and has detailed comment explaining its purpose.
queueSeveralMicrotas...