perf(typescript-plugin): redo single-file language service for Reactivity Visualization #5652
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Resolves #5650, partially reverts https://github.com/vuejs/language-tools/pull/5632/files#diff-7918fad7f00b0ebdd36f0242099e9d5a41469117455ca22f8f79333175ab7ffc.
The
getDefinitionAtPosition
andfindReferences
functions required by Reactivity Visualization only need to be evaluated for the current file. Maintaining a single-file TypeScript Language Service instance instead of reusing tsserver's Language Service will avoid cross-file semantic analysis, thereby significantly improving performance in large projects.