/**
 * Runtime-union projection helpers.
 * Handles widening, narrowing, and member-projection of runtime union expressions
 * via Match().
 */
import type { IrType } from "@tsonic/frontend";
import type { EmitterContext } from "../types.js";
import type { CSharpExpressionAst } from "../core/format/backend-ast/types.js";
export declare const maybeWidenRuntimeUnionExpressionAst: (ast: CSharpExpressionAst, actualType: IrType, context: EmitterContext, expectedType: IrType, visited: ReadonlySet<string>, selectedSourceMemberNs?: ReadonlySet<number>) => [CSharpExpressionAst, EmitterContext] | undefined;
export declare const maybeNarrowRuntimeUnionExpressionAst: (ast: CSharpExpressionAst, actualType: IrType, context: EmitterContext, expectedType: IrType, visited: ReadonlySet<string>, selectedSourceMemberNs?: ReadonlySet<number>) => [CSharpExpressionAst, EmitterContext] | undefined;
export declare const maybeProjectRuntimeUnionMemberExpressionAst: (ast: CSharpExpressionAst, actualType: IrType, context: EmitterContext, expectedType: IrType, visited: ReadonlySet<string>, selectedSourceMemberNs?: ReadonlySet<number>) => [CSharpExpressionAst, EmitterContext] | undefined;
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