Volar and vue-tsc are producing conflicting TypeScript error messages

During the development of my project using Vite, Vue 3, and TypeScript, I have set up vue-tsc to run in watch mode. I am utilizing VS Code along with Volar. This setup has been helpful as it displays all TypeScript errors in the console as expected, but I am also encountering additional errors from vue-tsc which are not present with Volar.

One specific error states that state.month is not compatible with type Date, even though it should be Date.

vue-tsc https://i.sstatic.net/8vTh3.png

In comparison, volar does not highlight this error for the same component https://i.sstatic.net/wGQU6.png

piece of code within the component's state where state.month is defined as Date. https://i.sstatic.net/KFZxU.png

I would appreciate some assistance. Could I have missed something important?

Answer №1

After realizing that the TypeScript version in my project's package.json didn't match the TypeScript version in VSCode, I discovered it was the cause of some strange errors. Once I updated the version in package.json to match the one in VSCode, all of the errors disappeared.

https://i.sstatic.net/tvXwG.png

Answer №2

One important tip is to ensure that your vue-tsc package is kept up-to-date. Volar, being a VS Code extension, automatically updates itself, but vue-tsc is an npm package and might remain at an older version if not manually updated.

This simple fix worked for me. To ensure you have the latest version for development purposes, execute npm i -D vue-tsc@latest.

You can find more information in the Volar repository: https://github.com/johnsoncodehk/volar/issues/1205

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