src/App.vue:8:4 - error TS2375: Type '{ alt: undefined; }' is not assignable to type 'ElementAttrs<ImgHTMLAttributes>' with 'exactOptionalPropertyTypes: true'. Consider adding 'undefined' to the types of the target's properties.
  Type '{ alt: undefined; }' is not assignable to type 'ImgHTMLAttributes' with 'exactOptionalPropertyTypes: true'. Consider adding 'undefined' to the types of the target's properties.
    Types of property 'alt' are incompatible.
      Type 'undefined' is not assignable to type 'string'.

8   <img :alt="msg" />
     ~~~

Found 1 error in src/App.vue:8

export interface ImgHTMLAttributes extends HTMLAttributes {
  alt?: undefined | string
  crossorigin?: 'anonymous' | 'use-credentials' | ''
  decoding?: 'async' | 'auto' | 'sync'
  height?: Numberish
  sizes?: string
  src?: string
  srcset?: string
  usemap?: string
  width?: Numberish
}

export interface ImgHTMLAttributes extends HTMLAttributes {
  alt?: string
  crossorigin?: 'anonymous' | 'use-credentials' | ''
  decoding?: 'async' | 'auto' | 'sync'
  height?: Numberish
  sizes?: string
  src?: string
  srcset?: string
  usemap?: string
  width?: Numberish
}