Bug: useMemo exec twice in StrictMode,But console.log only exec once,console.debug exec twice

[cqh963852]

React version:17.0.1

Steps To Reproduce

1. Wrap app in StrictMode
2. Do a function in useMemo

Link to code example:

https://codesandbox.io/s/vigilant-tree-igscd

The current behavior

The console.log in setSlot only exec once.

The expected behavior

Exec the console.log twice in setSlot funciton.

[bvaughn]

Related to #20367 and #20835 (this comment)

tl;dr Executing code twice in DEV is one of the things StrictMode does to detect side effects. React temporarily overrides console APIs like log before the second invocation to avoid double spamming the console.

This is a bit of a controversial decision but it seemed like the better of the two options.

[gaearon]

We've changed the logging behavior to be more intuitive in React 18.

See #21783 (comment).