import { isFunction, isString } from './utils/type-check'; export default { position({ top, left }) { if (!this.options.shift) { return; } let { shift } = this.options; if (isFunction(shift)) { shift = shift.call(this, { top, left }); } let shiftTop, shiftLeft; if (isString(shift)) { shift = shift.split(' '); shift[1] = shift[1] || shift[0]; ([shiftTop, shiftLeft] = shift); shiftTop = parseFloat(shiftTop, 10); shiftLeft = parseFloat(shiftLeft, 10); } else { ([shiftTop, shiftLeft] = [shift.top, shift.left]); } top += shiftTop; left += shiftLeft; return { top, left }; } };