Function step

test/33.database.aggregate.js:144–144

(ctx, ...args)

	});
	it('should accept a "varargs" option', function () {
		const step = (ctx, ...args) => args.reduce((a, b) => a * b, 1) + ctx;
		Object.defineProperty(step, 'length', { value: '-2' });
		this.db.aggregate('agg', { varargs: true, step });
		expect(this.get('agg()')).to.equal(1);