The plain-English version
A function together with access to variables in the surrounding scope where it was created.
Why it matters
Closures let callbacks remember values, but those values may belong to an earlier render or invocation.
Let’s make it click
A timer callback can use a task title from the function that created the timer.
Vibe Bro’s heads-up
A callback can read an older state value when you expected the latest one. Inspect when the callback was created.
The docs behind it
Documentation links checked .
Editorial review · October 28, 2026
Supported: Lexical scope and retained bindings are described accurately. A callback may refer to values from an earlier render; the wording does not claim every closure freezes a copy.