[Keir Bowden] The Summer 17 release of Salesforce sees the activation of the Lightning Components Locker Service critical update - something that I’d say has been anticipated and feared in equal measure since it was announced. If you’ve been hiding under a rock for the last couple of years, the Locker Service (among other things) adds a security layer to your Lightning Components JavaScript, isolating components by namespace to ensure that your Evil Co-worker can’t write components can’t go tinkering with the standard Salesforce components for nefarious purposes. – Learn more at Bob Buzzard