/* @flow */
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import { extend, warn, isObject } from 'core/util/index'
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/**
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* Runtime helper for rendering <slot>
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*/
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export function renderSlot (
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name: string,
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fallback: ?Array<VNode>,
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props: ?Object,
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bindObject: ?Object
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): ?Array<VNode> {
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const scopedSlotFn = this.$scopedSlots[name]
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let nodes
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if (scopedSlotFn) { // scoped slot
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props = props || {}
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if (bindObject) {
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if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
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warn(
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'slot v-bind without argument expects an Object',
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this
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)
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}
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props = extend(extend({}, bindObject), props)
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}
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nodes = scopedSlotFn(props) || fallback
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} else {
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nodes = this.$slots[name] || fallback
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}
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const target = props && props.slot
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if (target) {
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return this.$createElement('template', { slot: target }, nodes)
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} else {
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return nodes
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}
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}
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