For simple rules like function spacing, we can auto-fix these across the code
base so they are followed in a consistent way.
To generate this patch, I ran:
./mach eslint devtools --no-ignore --fix
After this, I reverted any changes to third party files that we really do want
to ignore.
MozReview-Commit-ID: 6Q8BApkAW20
The `flatten` function takes an array of arrays and flattens them to a single
array, removing one level of nesting. It does not recursively flatten multiple
levels of nesting.
MozReview-Commit-ID: ErDMHbT2IX
This commit adds the ThreadSafeDevToolsUtils module for utilities that are
guaranteed to work off the main thread. It also makes DevToolsUtils re-export
the thread-safe utilities. This is similar to ChromeUtils and
ThreadSafeChromeUtils webidl interfaces.
