To get Vue SFCs and TypeScript working together, Volar creates a separate TS language service instance patched with Vue-specific support, and uses it in Vue SFCs. At the same time, plain TS files are still handled by VSCode's built-in TS language service, which is why we need TypeScript Vue Plugin to support Vue SFC imports in TS files. This default setup works, but for each project we are running two TS language service instances: one from Volar, one from VSCode's built-in service. This is a bit inefficient and can lead to performance issues in large projects.
Volar provides a feature called "Takeover Mode" to improve performance. In takeover mode, Volar provides support for both Vue and TS files using a single TS language service instance.
- Disable built-in TypeScript extension:
- Run Extensions: Show Built-in Extensions command
- Find "TypeScript and JavaScript Language Features", right click and select: Disable (Workspace)
- Reload VSCode (F1 -> Reload Window)
- Start build process with Ctrl-Shift-B or "npm run dev" command
- Close the borwser if it appears
- Start debug mode with F5 key (open debug browser)
- Open the page where you want to debug the code
- Set some breakpoints before lines in the page's TS code
- In the browser cause the process to reach the breakpoint(S)
- Examine the variables, continue the execution step by step (F10, F11, or for next breakpont: F5)
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