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Update strict-mode.md (#3426)

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Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com>
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joan xie
2020-12-04 08:52:19 +08:00
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@@ -116,6 +116,10 @@ At first glance, this code might not seem problematic. But if `SharedApplication
By intentionally double-invoking methods like the component constructor, strict mode makes patterns like this easier to spot.
> Note:
>
> Starting with React 17, React automatically modifies the console methods like `console.log()` to silence the logs in the second call to lifecycle functions. However, it may cause undesired behavior in certain cases where [a workaround can be used](https://github.com/facebook/react/issues/20090#issuecomment-715927125).
### Detecting legacy context API {#detecting-legacy-context-api}
The legacy context API is error-prone, and will be removed in a future major version. It still works for all 16.x releases but will show this warning message in strict mode: