import type { NodeMetric } from "audit-tools/shared";
/** True for the JS/TS source files these metrics are defined over. */
export declare function isJsTsPath(path: string): boolean;
/**
 * Approximate cyclomatic complexity by counting branch/decision tokens plus a
 * base path of 1. Lexical (no parse) → tagged `cyclomatic-approx`. Returns
 * `undefined` for non-js/ts source.
 */
export declare function computeComplexityMetric(path: string, source: string): NodeMetric | undefined;
/**
 * Duplication measure: the count of non-trivial source lines that appear more
 * than once (i.e. the number of duplicated line occurrences, excluding the
 * first occurrence of each). Lines are normalized (trimmed + whitespace
 * collapsed); blank lines and lines shorter than 3 chars are ignored as noise.
 * Tagged `duplicate-line-count`. Returns `undefined` for non-js/ts source.
 */
export declare function computeDuplicationMetric(path: string, source: string): NodeMetric | undefined;
/**
 * Compute both metrics for one file. Returns `undefined` for non-js/ts source
 * (so the caller records no entry at all). For js/ts, always returns both a
 * complexity and a duplication metric.
 */
export declare function computeNodeMetricsForFile(path: string, source: string): {
    complexity?: NodeMetric;
    duplication?: NodeMetric;
} | undefined;
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