computed property classes should declare a type, like this

computed: {
  classes ():any {
    return {
      "navbar--on-scroll": this.onScroll,
      "navbar--active": this.navbarActive
    }
  }
}

ref

• typescript - ( VUE Computed ) Property 'XXX' does not exist on type 'CreateComponentPublicInstance' - Stack Overflow

在 script 中增加

import { defineComponent } from 'vue'

1. 将 export default { ... } 的形式改成 export default defineComponent({ ... }) 的形式即可

Bogus report, adding a type declaration resolves the issue.

([] as string[]).concat('foo')

ref

• Array.concat() is missing overload for non-Array arguments · Issue #36769 · microsoft/TypeScript

You should turn off the eslint core rule and turn on the typescript-eslint rule

rules: {
  "no-unused-vars": "off",
  "@typescript-eslint/no-unused-vars": "error"
}

原因是循环继承导致的

感叹号 !

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