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handler.call(vnode, event, vnode);\n } else if (typeof handler === \"object\") {\n // call handler with arguments\n if (typeof handler[0] === \"function\") {\n // special case for single argument for performance\n if (handler.length === 2) {\n handler[0].call(vnode, handler[1], event, vnode);\n } else {\n var args = handler.slice(1);\n args.push(event);\n args.push(vnode);\n handler[0].apply(vnode, args);\n }\n } else {\n // call multiple handlers\n for (var i = 0; i < handler.length; i++) {\n invokeHandler(handler[i]);\n }\n }\n }\n}\n\nfunction handleEvent(event, vnode) {\n var name = event.type,\n on = vnode.data.on;\n\n // call event handler(s) if exists\n if (on && on[name]) {\n invokeHandler(on[name], vnode, event);\n }\n}\n\nfunction createListener() {\n return function handler(event) {\n handleEvent(event, handler.vnode);\n }\n}\n\nfunction updateEventListeners(oldVnode, vnode) {\n var oldOn = oldVnode.data.on,\n oldListener = oldVnode.listener,\n oldElm = oldVnode.elm,\n on = vnode && vnode.data.on,\n elm = vnode && vnode.elm,\n name;\n\n // optimization for reused immutable handlers\n if (oldOn === on) {\n return;\n }\n\n // remove existing listeners which no longer used\n if (oldOn && oldListener) {\n // if element changed or deleted we remove all existing listeners unconditionally\n if (!on) {\n for (name in oldOn) {\n // remove listener if element was changed or existing listeners removed\n oldElm.removeEventListener(name, oldListener, false);\n }\n } else {\n for (name in oldOn) {\n // remove listener if existing listener removed\n if (!on[name]) {\n oldElm.removeEventListener(name, oldListener, false);\n }\n }\n }\n }\n\n // add new listeners which has not already attached\n if (on) {\n // reuse existing listener or create new\n var listener = vnode.listener = oldVnode.listener || createListener();\n // update vnode for listener\n listener.vnode = vnode;\n\n // if element changed or added we add all needed listeners unconditionally\n if (!oldOn) {\n for (name in on) {\n // add listener if element was changed or new listeners added\n elm.addEventListener(name, listener, false);\n }\n } else {\n for (name in on) {\n // add listener if new listener added\n if (!oldOn[name]) {\n elm.addEventListener(name, listener, false);\n }\n }\n }\n }\n}\n\nmodule.exports = {\n create: updateEventListeners,\n update: updateEventListeners,\n destroy: updateEventListeners\n};\n\n},{}]},{},[1])(1)\n});\n//# 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