style: Sync tooling configuration from 4.0 branch #2553
Merged
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Update ESLint and bring in a modified version of our config from 4.0. ESLint now manages running and checking prettier formatting so switching branches should be a more pleasant experience. Also updating mocha and bringing in the config from the 4.0 branch provides a similar convenience.
Fixed a few linter errors most of which were replace
hasOwnProperty
direct calls with indirectObject.prototype.hasOwnProperty.call
s.