lib/rules/keyword-spacing.js
function checkSpacingAfter(token, pattern) {
            checkMethodMap[token.value].after(token, pattern || NEXT_TOKEN);
        }
function checkSpacingAfter(token, pattern) {
            checkMethodMap[token.value].after(token, pattern || NEXT_TOKEN);
        }
function checkSpacingAfter ( token , pattern ) { checkMethodMap [ token . value ] . after ( token , pattern || NEXT_TOKEN ) ; }
Reports a given token if usage of spacing preceded by the token is
invalid.

@param {Token} token - A token to report.
@param {RegExp|undefined} pattern - Optional. A pattern of the next
token to check.
@returns {void}
Reports a given token if usage of spacing preceded by the token is invalid .