@vuesax-alpha/nightly/es/components/slot/src/only-child.mjs

A Component Library for Vue 3

import { defineComponent, inject, withDirectives, cloneVNode, Fragment, Text, Comment, h } from 'vue';
import { NOOP, isObject } from '@vue/shared';
import '../../../hooks/index.mjs';
import '../../../utils/index.mjs';
import { FORWARD_REF_INJECTION_KEY, useForwardRefDirective } from '../../../hooks/use-forward-ref/index.mjs';
import { debugWarn } from '../../../utils/error.mjs';
import { useNamespace } from '../../../hooks/use-namespace/index.mjs';

const NAME = "VsOnlyChild";
const OnlyChild = defineComponent({
  name: NAME,
  setup(_, { slots, attrs }) {
    return () => {
      var _a, _b;
      const forwardRefInjection = inject(FORWARD_REF_INJECTION_KEY, void 0);
      const forwardRefDirective = useForwardRefDirective(
        (_a = forwardRefInjection == null ? void 0 : forwardRefInjection.setForwardRef) != null ? _a : NOOP
      );
      const defaultSlot = (_b = slots.default) == null ? void 0 : _b.call(slots, attrs);
      if (!defaultSlot)
        return null;
      if (defaultSlot.length > 1) {
        debugWarn(NAME, "requires exact only one valid child.");
        return null;
      }
      const firstLegitNode = findFirstLegitChild(defaultSlot);
      if (!firstLegitNode) {
        debugWarn(NAME, "no valid child node found");
        return null;
      }
      return withDirectives(cloneVNode(firstLegitNode), [
        [forwardRefDirective]
      ]);
    };
  }
});
function findFirstLegitChild(node) {
  if (!node)
    return null;
  const children = node;
  for (const child of children) {
    if (isObject(child)) {
      switch (child.type) {
        case Comment:
          continue;
        case Text:
        case "svg":
          return wrapTextContent(child);
        case Fragment:
          return findFirstLegitChild(child.children);
        default:
          return child;
      }
    }
    return wrapTextContent(child);
  }
  return null;
}
function wrapTextContent(s) {
  const ns = useNamespace("only-child");
  return h(
    "span",
    {
      className: ns.e("content")
    },
    s
  );
}

export { OnlyChild };
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