/**
 * @module adaptive-expressions
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { ExpressionEvaluator } from '../expressionEvaluator';
/**
 * Check whether a string starts with a specific substring. Return true if the substring is found, or return false if not found.
 * This function is case-insensitive.
 */
export declare class StartsWith extends ExpressionEvaluator {
    /**
     * Initializes a new instance of the [StartsWith](xref:adaptive-expressions.StartsWith) class.
     */
    constructor();
    /**
     * @private
     */
    private static evaluator;
    /**
     * @private
     */
    private static validator;
}
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