From requireSpacesInCallExpression and disallowSpacesInCallExpression.

In JSCS, we can specify that spaces are required before the open parenthesis of call expressions.
In ESLint, no-spaced-func has a responsibility for spacing of call expressions.

This proposal is to add "always"/"never" option to no-spaced-func.
Maybe we should rename this rule to call-spacing or something like.

{
    "call-spacing": ["error", "always" or "never"]
}

• "always" - Requires spacing before the open parenthesis of call expressions.
• "never" (default) - Disallows spacing before the open parenthesis of call expressions. (the current behavior)