import { defineComponent, inject, withDirectives, cloneVNode, Fragment, createVNode, Text, Comment } from 'vue';
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import { NOOP, isObject } from '@vue/shared';
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import '../../../hooks/index.mjs';
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import '../../../utils/index.mjs';
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import { FORWARD_REF_INJECTION_KEY, useForwardRefDirective } from '../../../hooks/use-forward-ref/index.mjs';
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import { debugWarn } from '../../../utils/error.mjs';
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import { useNamespace } from '../../../hooks/use-namespace/index.mjs';
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const NAME = "ElOnlyChild";
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const OnlyChild = defineComponent({
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name: NAME,
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setup(_, {
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slots,
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attrs
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}) {
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var _a;
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const forwardRefInjection = inject(FORWARD_REF_INJECTION_KEY);
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const forwardRefDirective = useForwardRefDirective((_a = forwardRefInjection == null ? void 0 : forwardRefInjection.setForwardRef) != null ? _a : NOOP);
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return () => {
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var _a2;
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const defaultSlot = (_a2 = slots.default) == null ? void 0 : _a2.call(slots, attrs);
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if (!defaultSlot)
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return null;
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if (defaultSlot.length > 1) {
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debugWarn(NAME, "requires exact only one valid child.");
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return null;
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}
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const firstLegitNode = findFirstLegitChild(defaultSlot);
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if (!firstLegitNode) {
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debugWarn(NAME, "no valid child node found");
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return null;
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}
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return withDirectives(cloneVNode(firstLegitNode, attrs), [[forwardRefDirective]]);
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};
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}
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});
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function findFirstLegitChild(node) {
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if (!node)
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return null;
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const children = node;
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for (const child of children) {
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if (isObject(child)) {
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switch (child.type) {
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case Comment:
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continue;
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case Text:
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case "svg":
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return wrapTextContent(child);
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case Fragment:
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return findFirstLegitChild(child.children);
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default:
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return child;
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}
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}
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return wrapTextContent(child);
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}
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return null;
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}
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function wrapTextContent(s) {
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const ns = useNamespace("only-child");
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return createVNode("span", {
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"class": ns.e("content")
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}, [s]);
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}
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export { OnlyChild };
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//# sourceMappingURL=only-child.mjs.map
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