- **language-server:** support files that do not exist in FS but are open in the editor for TS project ([#235](https://github.com/volarjs/volar.js/issues/235))

- **typescript:** ensure unopened files are synced to project ([vuejs/language-tools#4711](https://github.com/vuejs/language-tools/issues/4711)) ([vuejs/language-tools#4632](https://github.com/vuejs/language-tools/issues/4632)) - Thanks to @davidmatter!

- **language-server:** avoid project initialized twice

- **language-service:** don't set item data if item has been resolved

- **language-service:** don't set item data if LanguageServicePlugin does not provide resolve hook ([#233](https://github.com/volarjs/volar.js/issues/233))

- **test-utils:** correct `openUntitledDocument` params order

- **typescript:** `runTsc` does not recognize service script with `preventLeadingOffset` enabled

- **language-server:** replace `setTimeout` with `setImmediate` ([#234](https://github.com/volarjs/volar.js/issues/234)) - Thanks to nieyuyao!

- **language-server:** add `onDidChange` API for `LanguageServer.workspaceFolders`

- **language-core:** add `error`, `source` params for `verification.shouldReport` hook