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* Add back caught error and other checks to 'lowPriorityWarning'
**what is the change?:**
This change makes 'lowPriorityWarning' an exact copy of 'warning.js' from
e66ba20ad5/packages/fbjs/src/__forks__/warning.js
where before we had skipped some checks from that module.
- Adds an error which we catch, in order to let people find the error and resulting stack trace when using devtools with 'pause on caught errors' checked.
- Adds check that 'format' argument is passed
**why make this change?:**
- To maintain a closer fork to 'warning.js'
- To allow easier debugging using 'pause on caught errors'
- To validate inputs to 'lowPriorityWarning'
**test plan:**
`yarn test`
**issue:**
* Update 'print-warnings' script to include 'lowPriorityWarning' output
**what is the change?:**
We print the logs from 'lowPriorityWarning' as well as 'warning' from the 'print-warnings' script.
NOTE: This PR is branching off of https://github.com/facebook/react/pull/9754
**why make this change?:**
We want to use the same process of white/blacklisting warnings with 'lowPriorityWarning' that we do with 'warning'.
**test plan:**
This is not super easy to test unless we are doing a sync with FB afaik. I plan on running a sync in the next few days, or next week at latest, for the sake of not landing big things on a Friday. That will be the actual test of this.
**issue:**
https://github.com/facebook/react/issues/9398
We use this script to extract all messages from warning() calls. They don't get substituted with anything in the source or the build. We only do this so we can have a copy of these messages in our internal repository and can spot accidental changes to them.