export function traverseNode(node: Object, callback: Function): void;
export function traverseNodes(nodes: any[], callback: Function): void;
export function findNode(nodes: any[], predicate: Function): Object | null;
export function findVariable(nodes: any[], variableId: string): Object | null;
export function findAllNodes(nodes: any[], predicate: Function): any[];
export function findAllVariables(nodes: any[]): any[];
export function countNodes(nodes: any[], predicate: Function): number;
export function countVariables(nodes: any[]): number;
export function variableExists(nodes: any[], variableId: string): boolean;
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