Is there a method to incorporate lists of varying types in a single v-for loop without causing any issues with type validations?

My current component is designed to display two different datasets, each with their own unique nature of data:

state.articleTypeList: string[]
state.renderPriceClassNameList: {[key: string]: string[]}

To render both datasets within a single v-for component, I am utilizing ternary operators:

<div
  v-for="(rootItem, key) in openTab === 1
    ? state.articleTypeList
    : state.renderPriceClassNameList"
  :key="key">
  <div
    @click="
      openTab === 1 ? getArticleList(rootItem) : getPriceClass(rootItem)
    "
    ...

In typescript, an error is displayed for rootItem, indicating:

Argument of type 'string | string[]' is not assignable to parameter of type 'string'
. This error should only occur when openTab !== 1.

Despite my search efforts, I have not found a solution to this error apart from encountering this git issue which offers no resolution. One possible alternative could involve separating the rendering of each dataset into its own v-for loop rather than using ternary operators, but this would require a significant overhaul of the entire component.

Is there a viable approach to address this challenge?

Answer №1

When openTab is followed by rootItem, Typescript does not recognize the dependency between them. For instance, given:

const foo = bar === 42 ? [1,2] : 3

The type of foo will be inferred as number[] | 3, and it will not dynamically adjust with subsequent conditions.

To provide this information to Typescript, you can use type assertions like:

@click="
  openTab === 1 ? getArticleList(rootItem as string) : getPriceClass(rootItem as string[])
"

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