/**
 * Phase composition interface for the PDF engine.
 *
 * Replaces the ad-hoc if-else ladder in `engine.ts:renderBuffer` with a
 * data-driven `composePhases([...])` runner. Each phase declares a
 * `matches(input)` predicate and a `run(input)` reducer; the runner
 * picks the first matching phase. Order in the array matters: phases
 * with stricter predicates (PDF/A → tagged accessibility → interactive
 * forms → tables → layout → flat) come first so the highest-applicable
 * phase wins.
 */
import type { PdfDocument, PdfRenderOptions } from "./engine.js";
import type { PdfEmbeddedFontInput } from "./font-embedding.js";
import type { PdfDocumentInteractiveSpec, PdfRenderedPage, PdfRenderMeta } from "./pdf-renderer.js";
export interface PhaseInput {
    /** The validated, preprocessed document. */
    document: PdfDocument;
    /** User-supplied render options (already conflict-checked by the engine). */
    options: PdfRenderOptions | undefined;
    /** Engine-resolved automatic fallback font (Pro-license-gated). */
    automaticFallbackFont: PdfEmbeddedFontInput | undefined;
}
export interface PhaseOutput {
    pages: PdfRenderedPage[];
    meta: PdfRenderMeta;
    interactive?: PdfDocumentInteractiveSpec;
}
export interface Phase {
    /** Human-readable name for diagnostics — e.g. "phase8-pdfa". */
    readonly name: string;
    /** Predicate: does this phase apply to the given input? */
    matches(input: PhaseInput): boolean;
    /** Materialize pages, meta, and interactive spec ready for `renderPdfPages`. */
    run(input: PhaseInput): Promise<PhaseOutput>;
}
export declare function composePhases(input: PhaseInput, phases: ReadonlyArray<Phase>): Promise<PhaseOutput>;
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