import { BaseError } from '@zetapush/common';
export declare class MissingKeyError extends BaseError {
    readonly key: string;
    readonly context: any;
    constructor(message: string, key: string, context: any, cause?: Error);
}
export declare class EvaluatorMissingKeyHandlerBuilder {
    private errorMsgBuilder?;
    private defaultValueBuilder?;
    /**
     * If a key is missing then generate an error message and throw an exception.
     *
     * @param message either a message or a function that provides a
     * message according to the key and the evaluation context
     */
    error(message: string): this;
    error(messageProvider: (key: string, context: any) => string): this;
    /**
     * If a key is missing, then an empty string is used in place.
     */
    ignore(): this;
    /**
     * If a key is missing then replace by a string value.
     *
     * @param value either a value or a function that provides a
     * value according to the key and the context.
     */
    defaultValue(value: string): this;
    defaultValue(valueProvider: (key: string, context: any) => string): this;
    build(): (key: string, context: any) => string;
}
export declare const failOnMissingKeyHandler: (key: string, context: any) => string;
export declare class VariableEvaluator {
    private missingKeyHandler;
    constructor(missingKeyHandler?: (key: string, context: any) => string);
    evaluate(str: string, context: any): string;
}