Function discriminatedUnionValueForTab

discriminatedUnionValueForTab(
    optionLabels: readonly string[],
    discKey: string,
    newIndex: number,
): Record<string, string> | undefined
Pure helper: convert a tab index into the new value the discriminated union should emit. Returns undefined when the index is out of bounds.

Extracted so the contract is unit-testable without instantiating the Vue component (which relies on the Vue runtime).
Parameters
- optionLabels: readonly string[]
- discKey: string
- newIndex: number
Returns Record<string, string> | undefined
- Defined in packages/core/src/vue/renderers.ts:823