/**
 * Internal: the fn: reference rules the tree validator enforces on the wire —
 * 01 §8 grammar on TreeQuery.tool and action names. Not exported from the
 * package root.
 */
/** 01-core §8: `fn:<name>` with `<name>` matching this grammar. */
export declare const FN_REFERENCE_PATTERN: RegExp;
/** The first grammar-violating `fn:` action reference in a props value, or
 *  null. HOT wire path: validateTree runs on every render, so this walk is
 *  allocation-free (no collected arrays, no Object.values copies) — the
 *  tree-render perf budget is measured with it inline. */
export declare function findInvalidActionReference(value: unknown): string | null;
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