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45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
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import { options } from 'preact';
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import { assign } from './util';
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let oldDiffHook = options._diff;
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options._diff = vnode => {
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if (vnode.type && vnode.type._forwarded && vnode.ref) {
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vnode.props.ref = vnode.ref;
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vnode.ref = null;
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}
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if (oldDiffHook) oldDiffHook(vnode);
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};
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export const REACT_FORWARD_SYMBOL =
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(typeof Symbol != 'undefined' &&
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Symbol.for &&
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Symbol.for('react.forward_ref')) ||
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0xf47;
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/**
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* Pass ref down to a child. This is mainly used in libraries with HOCs that
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* wrap components. Using `forwardRef` there is an easy way to get a reference
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* of the wrapped component instead of one of the wrapper itself.
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* @param {import('./index').ForwardFn} fn
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* @returns {import('./internal').FunctionComponent}
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*/
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export function forwardRef(fn) {
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function Forwarded(props) {
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let clone = assign({}, props);
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delete clone.ref;
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return fn(clone, props.ref || null);
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}
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// mobx-react checks for this being present
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Forwarded.$$typeof = REACT_FORWARD_SYMBOL;
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// mobx-react heavily relies on implementation details.
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// It expects an object here with a `render` property,
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// and prototype.render will fail. Without this
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// mobx-react throws.
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Forwarded.render = Forwarded;
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Forwarded.prototype.isReactComponent = Forwarded._forwarded = true;
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Forwarded.displayName = 'ForwardRef(' + (fn.displayName || fn.name) + ')';
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return Forwarded;
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}
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