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What is this?
Protractor and many WebDriver libraries allow a control flow syntax where asynchronous code can be written as if it were synchronous. While this feature is largely deprecated, current Protractor docs and legacy test suites still use this control flow syntax. Rather than requiring a user to rewrite their entire test suite away from control flow towards async/await in order to use Percy, we can enable control flow usage by utilizing Protractor's
browser.call
method which adds an async function to the control flow context.