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fix(types): allow scoped slots to return a single VNode #9563

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merged 3 commits into from
Feb 28, 2019

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KaelWD
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@KaelWD KaelWD commented Feb 24, 2019

What kind of change does this PR introduce? (check at least one)

  • Bugfix
  • Feature
  • Code style update
  • Refactor
  • Build-related changes
  • Other, please describe:

Does this PR introduce a breaking change? (check one)

  • Yes
  • No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

If adding a new feature, the PR's description includes:

  • A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

Scoped slots are normalised to VNode[], but they should still be able to return a bare string or VNode when used in a render function.
https://codepen.io/anon/pen/BMXvme?editors=1010

@yyx990803 yyx990803 requested a review from ktsn February 25, 2019 15:41
types/vnode.d.ts Outdated
@@ -1,7 +1,8 @@
import { Vue } from "./vue";

export type ScopedSlot = (props: any) => VNode | VNode[] | string | undefined;
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I guess the return type should have similar type with VNodeChildren as it is normalized as same as vnode children.

function normalizeScopedSlot(normalSlots, key, fn) {
const normalized = scope => {
let res = fn(scope || {})
res = res && typeof res === 'object' && !Array.isArray(res)
? [res] // single vnode
: normalizeChildren(res)
return res && res.length === 0
? undefined
: res
}

Maybe it will be:

type ScopedSlot = (props: any) => ScopedSlotReturn;
type ScopedSlotReturn = VNode | string | boolean | null | undefined | ScopedSlotReturnArray;
interface ScopedSlotReturnArray extends Array<ScopedSlotReturn> {}

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@KaelWD are you planning to update the PR according to the suggestion?

@yyx990803 yyx990803 merged commit 241eea1 into vuejs:dev Feb 28, 2019
kiku-jw pushed a commit to kiku-jw/vue that referenced this pull request Jun 18, 2019
Lostlover pushed a commit to Lostlover/vue that referenced this pull request Dec 10, 2019
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3 participants