/**
 * Suggesting what somebody probably meant.
 *
 * Used for an unrecognised CLI flag and an unrecognised config key. Both are
 * the same failure: a name that looks right, is silently not the name the tool
 * reads, and leaves a limit unenforced while the author believes it is set.
 */
export declare function editDistance(a: string, b: string): number;
/**
 * The closest candidate, or null when nothing is close enough to name.
 *
 * **The tolerance scales with the length of what was typed**, and that is the
 * whole reason this function exists rather than a fixed threshold. Three edits
 * is a plausible typo on `max-tokens` and a completely different word on
 * `llm` — which is how a fixed budget of three came to answer "did you mean
 * --help?" for `--llm`. A wrong guess is worse than no guess: it sends the
 * reader off to check something that was never the answer.
 */
export declare function nearestName(typed: string, candidates: readonly string[]): string | null;
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