Add a step to check typedoc in CI

Author: fs-eire

tools/ci_build/github/azure-pipelines/templates/linux-web-init-and-check.yml

@@ -31,6 +31,10 @@ steps:
     node -e "a=require('child_process').execSync('git diff --name-only').toString();if(a)throw new Error('Following source files are not formatted: (did you run \"npm run format\"?)\n'+a)"
   workingDirectory: '$(Build.SourcesDirectory)/js'
   displayName: 'Check unformatted files'
+- script: |
+    npx typedoc --emit none --treatWarningsAsErrors
+  workingDirectory: '$(Build.SourcesDirectory)/js/common'
+  displayName: 'TypeDoc Validation'
 - script: |
     npm run build:doc
   workingDirectory: '$(Build.SourcesDirectory)/js/web'