import type { EngineId } from '../types.js';
export type EngineSelection = {
    kind: 'none';
} | {
    kind: 'engines';
    engines: EngineId[];
} | {
    kind: 'empty';
};
/** Classify raw engine tokens (trimmed/lowercased, blanks ignored). */
export declare function selectEngines(tokens: readonly string[]): EngineSelection;