import type { IrType } from "@tsonic/frontend";
import type { EmitterContext } from "../../types.js";
import type { CSharpTypeAst } from "../format/backend-ast/types.js";
export declare const buildRuntimeUnionMemberIndexByAstKey: (memberTypeAsts: readonly CSharpTypeAst[]) => ReadonlyMap<string, number>;
export declare const findMappedRuntimeUnionMemberIndex: (opts: {
    readonly targetMembers: readonly IrType[];
    readonly targetMemberIndexByAstKey: ReadonlyMap<string, number>;
    readonly actualMember: IrType;
    readonly actualMemberTypeAst?: CSharpTypeAst;
    readonly context: EmitterContext;
}) => number | undefined;
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