Reproduction for vuejs/language-tools#5226

Run npm run test to see the reported issue.

src/example.vue:20:26 - error TS18047: '__VLS_ctx.example.foo' is possibly 'null'.

Workaround

• Run npm i [email protected] to downgrade vue-tsc to 2.2.4.
• Run npm run test and see the error no longer occurs