Vue 2.7 types `$refs` as an index signature, so the TypeScript service sends `this.$refs.child` to that signature in vue.d.ts and finds nothing for `this.$refs.child.focusIt`.
Go to Declaration in a Vue SFC's script now reads the template: `this.$refs.<name>` goes to the `ref="<name>"` attribute, and a member read from a component's ref goes to that member in the component's options (methods, computed, props, data() / setup() return). The component comes from the default import its tag names; relative paths resolve directly, aliases through the language service, then `@/` as `src/`.
Fixes#2940
l0ng-ai
4f9dc0a56c