import type { PipelineOverlay, StepEnablementEntry } from '../../types/index.js';
/**
 * Apply a project-type overlay to resolved pipeline state.
 *
 * Pure function — no I/O, no side effects. Spreads input maps,
 * applies overlay overrides (replace-then-append-then-dedup),
 * and returns new pipeline state without mutating inputs.
 */
export declare function applyOverlay(steps: Record<string, StepEnablementEntry>, knowledgeMap: Record<string, string[]>, readsMap: Record<string, string[]>, dependencyMap: Record<string, string[]>, crossReadsMap: Record<string, Array<{
    service: string;
    step: string;
}>>, overlay: PipelineOverlay): {
    steps: Record<string, StepEnablementEntry>;
    knowledge: Record<string, string[]>;
    reads: Record<string, string[]>;
    dependencies: Record<string, string[]>;
    crossReads: Record<string, Array<{
        service: string;
        step: string;
    }>>;
};
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