export default function (runCallbacks = true, direction) {
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const swiper = this;
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const { activeIndex, params, previousIndex } = swiper;
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if (params.cssMode) return;
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if (params.autoHeight) {
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swiper.updateAutoHeight();
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}
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let dir = direction;
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if (!dir) {
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if (activeIndex > previousIndex) dir = 'next';
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else if (activeIndex < previousIndex) dir = 'prev';
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else dir = 'reset';
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}
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swiper.emit('transitionStart');
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if (runCallbacks && activeIndex !== previousIndex) {
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if (dir === 'reset') {
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swiper.emit('slideResetTransitionStart');
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return;
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}
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swiper.emit('slideChangeTransitionStart');
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if (dir === 'next') {
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swiper.emit('slideNextTransitionStart');
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} else {
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swiper.emit('slidePrevTransitionStart');
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}
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}
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}
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