c3/src/api.chart.js

c3_chart_fn.resize = function (size) {
    var $$ = this.internal, config = $$.config;
    config.size_width = size ? size.width : null;
    config.size_height = size ? size.height : null;
    this.flush();
};

c3_chart_fn.flush = function () {
    var $$ = this.internal;
    $$.updateAndRedraw({withLegend: true, withTransition: false, withTransitionForTransform: false});
};

c3_chart_fn.destroy = function () {
    var $$ = this.internal;
    $$.data.targets = undefined;
    $$.data.xs = {};
    $$.selectChart.classed('c3', false).html("");
    window.clearInterval($$.intervalForObserveInserted);
    window.onresize = null;
};