/**
 * Duplicate type declaration suppression and deduplication planning.
 *
 * Extracted from emitter.ts — contains the logic that detects duplicate type
 * declarations across modules and builds suppression/canonicalization plans
 * so that only one copy of each structurally-identical type is emitted.
 */
import type { Diagnostic, IrModule } from "@tsonic/frontend";
export type DuplicatePlanResult = {
    readonly ok: true;
    readonly suppressed: ReadonlySet<string>;
    readonly canonicalLocalTypeTargets: ReadonlyMap<string, string>;
} | {
    readonly ok: false;
    readonly errors: readonly Diagnostic[];
};
export declare const planDuplicateTypeSuppression: (modules: readonly IrModule[]) => DuplicatePlanResult;
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