自己找的leaflet相关js插件，怎么引入？请问下 ，我自己找个leaflet插件js怎么引入。？

• import '@/libs/leaflet/leaflet.css';
  import L from '@/libs/leaflet/leaflet'
  import '@/libs/leaflet/leaflet.ChineseTmsProviders.js'
  import '@/libs/leaflet/leaflet.mapCorrection.js'
  import '@/libs/leaflet/leaflet.rotatedMarker.js'
  import '@/libs/leaflet/leaflet-gradient.js'
  import '@/libs/leaflet/terraformer'
  import Terraformer from '@/libs/leaflet/terraformer-wkt-parser'

我自己找的js插件。引入这两个报错
import '@/libs/leaflet/leaflet.rotatedMarker.js'
import '@/libs/leaflet/leaflet-gradient.js'

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21:40:28.183 Error: Cannot find module 'leaflet' at view.umd.min.js:1