www/build/tools/csslint-rhino.js
function (actual, message) {
        YUITest.Assert._increment();
        if (typeof actual != "boolean"){
            throw new YUITest.UnexpectedValue(YUITest.Assert._formatMessage(message, "Value should be a Boolean."), actual);
        }
    }
function (actual, message) {
        YUITest.Assert._increment();
        if (typeof actual != "boolean"){
            throw new YUITest.UnexpectedValue(YUITest.Assert._formatMessage(message, "Value should be a Boolean."), actual);
        }
    }
function ( actual , message ) { YUITest . Assert . _increment ( ) ; if ( typeof actual != "boolean" ) { throw new YUITest . UnexpectedValue ( YUITest . Assert . _formatMessage ( message , "Value should be a Boolean." ) , actual ) ; } }
Asserts that a value is a Boolean.
@param {Object} actual The value to test.
@param {String} message (Optional) The message to display if the assertion fails.
@method isBoolean
@static
Asserts that a value is a Boolean .