nacos in ng ssr server.ts not work

[LauGaHo]

my ng project use nacos, I write it in the server.ts, through webpack , it found that error

error msg as followed:

Unhandled Promise rejection: _this3._client.getConfigs is not a function ; Zone: <root> ; Task: Promise.then ; Value: TypeError: _this3._client.getConfigs is not a function
  at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:256766:35
  at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:364731:24)
    at _next (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:364750:9)
    at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:364755:7
    at new ZoneAwarePromise (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:361963:23)
    at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:364747:12
    at NacosConfigClient.getConfigs (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:256767:7)
    at 2747 (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:363281:14)
    at __webpack_require__ (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:528907:42) TypeError: _this3._client.getConfigs is not a function
    at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:256766:35
    at Generator.next (<anonymous>)
      at asyncGeneratorStep (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:364731:24)
      at _next (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:364750:9)
      at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:364755:7
      at new ZoneAwarePromise (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:361963:23)
      at /Users/Documents/my-framework/dist/apps/my-app/server/main.js:364747:12
      at NacosConfigClient.getConfigs (/Users/Documents/my-framework/dist/apps/my-app/server/main.js:256767:7)

my code as followed:

const configClient = new NacosConfigClient({
  serverAddr: 'xxxxxxxxxxx:443',
  namespace: 'xxxxxxxxx',
  username: 'xxxxxx',
  ssl: true,
  password: 'xxxxxx'
});

const content = configClient.getConfig('xxx', 'xxxxxx').then((res) => {
  
});

pls help me thanks