express - node.js module require() twice -- (relative path) -

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why qrchannelservice module required twice(mongoose throw overwritemethod error), why didn't cached ?

qrchannelservice path: mit/src/modules/qrchannel/services/qrchannelservice.js

require

path1: mit/src/controllers/api/qr.js var qrcodeservice = require('../../modules/qrchannel/services/qrchannelservice');


path2: mit/src/modules/qrchannel/common/qrhandlerdispather.js var qrchannelservice = require('../services/qrchannelservice');


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