/**
 * Resolve the ttsc helper binary path, or null when unavailable.
 *
 * Resolution order:
 *
 * 1. `TTSC_BINARY` env var — must be an absolute path when set.
 * 2. The per-platform npm package `@ttsc/<platform>-<arch>/bin/ttsc[.exe]`.
 * 3. A `ttsc-native[.exe]` sibling of this package's root (dev/CI layout).
 */
export declare function resolveBinary(opts?: {
    env?: NodeJS.ProcessEnv;
}): string | null;