Problem assets commercial html theme with meteor and react router

Hello, I am new in javascript development meteor, I would like to integrate a commercial html theme, how to integrate assets and external javascript files into meteor with react router ? with iron router i use miro: preloaderr package and with Flowouter I used ostrio: flow-router-meta. The problem is that with react router I do not know how to do.

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Thank for your answer :thumbsup: ,but it does not help me much,