feat: Use ES6 syntax (class, const/let, arrow functions) #551
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Background
I try to update Spectron to WebDriverIO v5 (#349), but I realized I have to refactor it before update.
Changes
Use ES6 features: class keyword, const/let, arrow functions.
classkeywords for Application, Api, ChromeDriverconstorletfor definition variables instead ofvarfunction()addClientProperty,addClientPropertiesinapi.js(this script usesthis)selfcould be deleted