/**
 * Template expander: substitute positional slot values into a template body.
 *
 * The engine marks variable slots with `$` (bare) or `$(format-spec)` in the
 * template body. `encoded.log` lines carry the slot values in the same order
 * the slots appear left-to-right in the template. To recover the original
 * text we substitute each `$` (and each `$(...)`) with the corresponding
 * value from the `values[]` array.
 *
 * This is the inverse of the engine's templating pass. It is NOT lossless
 * for timestamp slots (the engine emits the epoch epoch value as a formatted
 * string; we reverse the slot marker with the raw value from `values[]`). For
 * compaction measurement that is fine: we care about byte lengths, not exact
 * round-trip fidelity.
 *
 * Unit-testable: `expandTemplate(template, values)` is a pure function.
 */
/**
 * Expand a template body by substituting `$` slot markers with positional
 * values.
 *
 * Slot markers in the template:
 *   - Bare `$`               — consume the next value from `values[]`
 *   - `$(format-spec)`       — consume the next value; the spec is dropped
 *
 * Values beyond the slot count are ignored. Slots without a corresponding
 * value are left as the empty string (best-effort: a missing trailing slot
 * should not abort the expansion).
 *
 * @param template  Template body string from `templates.json`
 * @param values    Slot values in positional order from the `encoded.log` line
 * @returns         Reconstructed original log text
 */
export declare function expandTemplate(template: string, values: string[]): string;
/**
 * Measure the UTF-8 byte length of the original log line reconstructed
 * from a template + values. Convenience wrapper for compaction measurement.
 */
export declare function expandedByteLength(template: string, values: string[]): number;