lib/options.js
function(opts) {
		opts.metrics = opts.metrics || require('./metrics').builtIns;
		if (typeof opts.metrics === 'string') {
			opts.metrics = opts.metrics.split(/[,;]/);
		} else if (typeof opts.metrics === 'function') {
			opts.metrics = [opts.metrics];
		}
		return opts;
	}
function(opts) {
		opts.metrics = opts.metrics || require('./metrics').builtIns;
		if (typeof opts.metrics === 'string') {
			opts.metrics = opts.metrics.split(/[,;]/);
		} else if (typeof opts.metrics === 'function') {
			opts.metrics = [opts.metrics];
		}
		return opts;
	}
metrics