79023ee190
Reviewed By: bhamodi Differential Revision: D33331422 fbshipit-source-id: 016e8dcc0c0c7f1fc353a348b54fda0d5e2ddc01
48 lines
1.3 KiB
TypeScript
48 lines
1.3 KiB
TypeScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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*/
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import {ReactNode, ReactElement} from 'react';
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function isReactElement(object: any) {
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return (
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typeof object === 'object' &&
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object !== null &&
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object.$$typeof === Symbol.for('react.element')
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);
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}
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/**
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* Recursively walks through all children of a React element and returns
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* the string representation of the leafs concatenated.
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*/
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export function textContent(node: ReactNode): string {
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let res = '';
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const traverse = (node: ReactNode) => {
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if (typeof node === 'string' || typeof node === 'number') {
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// this is a leaf, add it to the result string
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res += node;
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} else if (Array.isArray(node)) {
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// traverse all array members and recursively stringify them
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node.forEach(traverse);
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} else if (isReactElement(node)) {
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// node is a react element access its children an recursively stringify them
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const {children} = (node as ReactElement).props;
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if (Array.isArray(children)) {
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children.forEach(traverse);
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} else {
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traverse(children);
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}
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}
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};
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traverse(node);
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return res;
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}
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