/**
 * @module adaptive-expressions
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { Expression } from '..';
import { ExpressionEvaluator } from '../expressionEvaluator';
import { Options } from '../options';
/**
 * Evaluator that transforms a string to another string.
 */
export declare class StringTransformEvaluator extends ExpressionEvaluator {
    /**
     * Initializes a new instance of the [StringTransformEvaluator](xref:adaptive-expressions.StringTransformEvaluator) class.
     *
     * @param type Name of the built-in function.
     * @param func The string transformation function, it takes a list of objects and returns an string.
     * @param validator The validation function.
     */
    constructor(type: string, func: (arg0: any[], options: Options) => string, validator?: (expr: Expression) => void);
}
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