import { Code } from './code';
export interface ObjectField {
    renderedField: string;
    propertyRegex?: string;
}
export declare class ToJsonFunction {
    private readonly baseType;
    private readonly internal;
    /**
     * The name the toJson function for a struct.
     */
    readonly functionName: string;
    private readonly fields;
    constructor(baseType: string, internal?: boolean);
    /**
     * Adds a field to the struct.
     *
     * @param schemaName The name of the property in the schema ("to")
     * @param propertyName The name of the TypeScript property ("from")
     * @param toJson A function used to convert a value from JavaScript to schema
     * format. This could be `x => x` if no conversion is required.
     */
    addField(schemaName: string, propertyName: string, toJson: ToJson, propertyRegex?: string): void;
    emit(code: Code): void;
}
/**
 * A function that converts an expression from JavaScript to schema format.
 *
 * @example x => x
 * @example x => x?.map(y => toJson_Foo(y))
 */
export type ToJson = (expression: string) => string;