/**
 * `QualifiedNameIndex` — O(1) `qualifiedName → DefId[]` lookup across all kinds.
 *
 * Cross-kind fast path for qualified-name resolution
 * (`lookupQualified(qname, scope, params)` in RFC §4.5). Class, method,
 * field, and namespace defs all contribute to a single index here; consumers
 * filter the returned `DefId[]` by `p.acceptedKinds` at the call site.
 *
 * Returns `DefId[]` (not a single `DefId`) because multiple defs can legally
 * share a qualified name — partial classes in C#, method overloads, or
 * accidental cross-kind collisions. The lookup caller filters to the expected
 * kind(s) and ranks the survivors.
 *
 * Part of RFC #909 Ring 2 SHARED — #913.
 *
 * Consumed by: #917 (`Registry.lookup` qualified fast path, `resolveTypeRef`
 * dotted fallback via #916).
 */
import type { SymbolDefinition } from './symbol-definition.js';
import type { DefId } from './types.js';
export interface QualifiedNameIndex {
    readonly byQualifiedName: ReadonlyMap<string, readonly DefId[]>;
    readonly size: number;
    /** Returns all `DefId`s registered under this qualified name; empty frozen
     *  array on miss so callers can iterate without null checks. */
    get(qualifiedName: string): readonly DefId[];
    has(qualifiedName: string): boolean;
}
/**
 * Build a `QualifiedNameIndex` from a flat list of `SymbolDefinition` records.
 *
 * Only defs with a non-empty `qualifiedName` contribute; defs without one are
 * silently skipped (not every kind carries a qualified name — anonymous or
 * top-level symbols, dynamic-unresolved imports, etc.).
 *
 * **Duplicate policy: appended in input order.** Each unique `(qname, DefId)`
 * pair contributes at most once — repeated entries for the same pair are
 * deduplicated. Distinct `DefId`s sharing a `qname` accumulate in insertion
 * order (stable output for deterministic lookup ranking at the call site).
 *
 * Pure function — safe to call repeatedly; no side effects.
 */
export declare function buildQualifiedNameIndex(defs: readonly SymbolDefinition[]): QualifiedNameIndex;
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