Interface dependency injection

[mcnLeandro]

If use Interface(not actual) have to think about dependency injection

JavaScript is dynamic, and we can't type declaration.

interface Focusable {
    focus(){}
}

Class Focus {
  // js is dynamic so argument name is important to express dependency injection
    focuTo(focusable){
        focusable.focus()
    }
}

• [x] rename arguments in project

[mcnLeandro]

Resolved, There was no unsuitable argument name, so did't changed any of arguments

750c253

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