export { isConstantNode, isSymbolNode as isVariableNode } from '../../utils/is.js';
import type { MathNode } from '../../utils/node.js';
/**
 * Return true if `x` is a ConstantNode, or a unary OperatorNode whose operand is a
 * ConstantNode (for example `-2`).
 */
export declare function isNumericNode(x: MathNode): boolean;
/**
 * Return true if `x` contains no symbols.
 *
 * The test is true for a ConstantNode, and for a FunctionNode or an OperatorNode whose
 * arguments are all constant expressions (recursive test).
 */
export declare function isConstantExpression(x: MathNode): boolean;
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