get_react_instances_for_node.js

function getReactInstancesForNode (node, { firstOnly } = {}) {
    const key = Object.keys(node).find(key => key.startsWith("__reactInternalInstance$"));
    let inst = node[key];
    const results = [];
    while (inst) {
        if (typeof inst.elementType === "function") {
            const result = {
                type: inst.elementType,
            };
            if (inst.stateNode) {
                // NOTE: stateless components have no instance
                result.instance = inst.stateNode;
            }
            if (inst.memoizedProps) {
                result.props = inst.memoizedProps;
            }
            if (inst.memoizedState) {
                // NOTE: stateless components have no instance
                result.state = inst.memoizedState;
            }
            if (firstOnly) {
                return result;
            }
            results.push(result);
        }
        inst = inst.return;
    }
    return results;
}