import type { CSharpTypeAst } from "../format/backend-ast/types.js";
export type RuntimeUnionCarrierMetadata = {
    readonly familyKey: string;
    readonly name?: string;
    readonly namespaceName?: string;
    readonly typeParameters?: readonly string[];
    readonly definitionMemberTypeAsts?: readonly CSharpTypeAst[];
    readonly accessModifier?: "public" | "internal";
};
export type RuntimeUnionCarrierDefinition = {
    readonly key: string;
    readonly name: string;
    readonly namespaceName: string;
    readonly fullName: string;
    readonly arity: number;
    readonly typeParameters: readonly string[];
    readonly memberTypeAsts: readonly CSharpTypeAst[];
    readonly memberTypeKeys: readonly string[];
    readonly accessModifier: "public" | "internal";
};
export type RuntimeUnionRegistry = {
    readonly definitions: Map<string, RuntimeUnionCarrierDefinition>;
    readonly definitionsByName: Map<string, RuntimeUnionCarrierDefinition>;
};
export declare const createRuntimeUnionRegistry: () => RuntimeUnionRegistry;
export declare const getRuntimeUnionCarrierDefinitionByName: (name: string, registry: RuntimeUnionRegistry | undefined) => RuntimeUnionCarrierDefinition | undefined;
export declare const getOrRegisterRuntimeUnionCarrier: (memberTypeAsts: readonly CSharpTypeAst[], registry: RuntimeUnionRegistry | undefined, metadata?: RuntimeUnionCarrierMetadata) => RuntimeUnionCarrierDefinition;
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