I mean, it's the general case of the "get" and "set" when defining a method: https://www.ecma-international.org/ecma-262/6.0/#sec-method-definitions-runtime-semantics-propertydefinitionevaluation
That being said, there's a lot of "you just shouldn't do that" in javascript. Looking at you, `undefined` not being a reserved word. Syntax aside, a question that hasn't been sufficiently answered is what value does this actually add other than "I don't want to type ,"? Arguments for "easier to read code" I would absolutely disagree with, since it may be easier for one person, but not another. Giving a "line break matters" is a terrible answer, since that would break a ton of backwards compatibility.
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