/** Which counting rule to use. One value per model family the targets use. */
export type EstimatorFamily = "claude" | "gpt" | "generic";
/** Estimates how many tokens a piece of text costs. */
export interface TokenEstimator {
    /** Deterministic: the same text always returns the same count. Never negative. */
    estimate(text: string): number;
}
/** Chooses an estimator. */
export interface EstimatorFactory {
    /** Returns the estimator for a family. Falls back to "generic" for an unknown family. */
    forFamily(family: EstimatorFamily): TokenEstimator;
}