/**
 * Best-effort caller-frame capture for the `${callsite}` layout variable.
 *
 * NLog gates stack-trace capture behind `StackTraceUsage` so that logging is
 * zero-cost unless a target's layout actually references the caller. This
 * mirrors that: {@link FrameworkLogger} only calls {@link captureCallsite}
 * when some target's layout references `${callsite}`, so the `new Error()`
 * ( the only cost here ) is never constructed otherwise.
 *
 * The parser is intentionally defensive - it must NEVER throw. Browser stack
 * formats vary and V8's format is not guaranteed, so an unparseable stack just
 * yields `""` rather than crashing a log call.
 */
/**
 * Walk the current stack and return the first frame OUTSIDE the log package -
 * i.e. the user's call site - as `"basename:line"` ( e.g. `service.ts:42` ).
 *
 * Internal frames belonging to the logger itself ( `log.ts`, `callsite.ts`,
 * the `log-common` package, `wrapWrite`, `createLogMessageObject` ) are skipped
 * so the returned frame is the caller of `log.info(...)` / `log.error(...)`.
 *
 * Returns `""` when no frame can be parsed ( no stack, or an unrecognized
 * stack format ). Best-effort by design.
 */
export declare function captureCallsite(): string;
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