/**
 * Lambda parameter emission and lowering.
 *
 * Extracted from functions.ts — contains parameter type resolution,
 * typed parameter AST emission, default-value lowering, and destructuring
 * prelude generation for lambda expressions.
 */
import { IrExpression, IrParameter, IrType } from "@tsonic/frontend";
import { EmitterContext } from "../types.js";
import type { CSharpExpressionAst, CSharpLambdaParameterAst, CSharpStatementAst } from "../core/format/backend-ast/types.js";
export type EmittedLambdaParameter = {
    readonly parameter?: IrParameter;
    readonly ast?: CSharpLambdaParameterAst;
    readonly emittedName: string;
    readonly bindsDirectly: boolean;
    readonly resolvedType?: IrType;
    readonly bindingSourceExpression?: CSharpExpressionAst;
    readonly bindingSourceType?: IrType;
};
export declare const seedLocalNameMapFromParameters: (params: readonly EmittedLambdaParameter[], context: EmitterContext) => EmitterContext;
export type ContextualFunctionType = Extract<IrType, {
    kind: "functionType";
}>;
export declare const resolveContextualFunctionType: (expr: Extract<IrExpression, {
    kind: "functionExpression" | "arrowFunction";
}>, expectedType: IrType | undefined, context: EmitterContext) => ContextualFunctionType | undefined;
/**
 * Emit lambda parameters as typed AST nodes.
 */
export declare const emitLambdaParametersAst: (parameters: readonly IrParameter[], context: EmitterContext, contextualFunctionType?: ContextualFunctionType) => [readonly EmittedLambdaParameter[], EmitterContext];
export declare const lowerLambdaParameterPreludeAst: (parameters: readonly EmittedLambdaParameter[], context: EmitterContext) => [readonly CSharpStatementAst[], EmitterContext];
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