/**
 * @fileoverview Shared presentation formatters.
 *
 * Small, dependency-free helpers used by more than one tool's CLI/report
 * layer. Kept in core because tools sit in a peer layer and cannot depend on
 * each other — core is their only shared home.
 */
/**
 * Format a millisecond duration as `"Xms"` under one second, `"X.Ys"` for
 * sub-minute durations, or `"Xm Y.Ys"` at minute scale.
 *
 * @example formatDuration(450)  // "450ms"
 * @example formatDuration(1500) // "1.5s"
 * @example formatDuration(1471600) // "24m 31.6s"
 */
export declare function formatDuration(ms: number): string;
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