import * as ts from 'typescript';
import * as Lint from 'tslint';
import { Rule as BaseUnusedExpressionRule } from 'tslint/lib/rules/noUnusedExpressionRule';
/**
 * Implements no-unused-expression-chai rules
 * To honor base rule's behavior, it inherits from default no-unused-expression rule
 * and override specific failure only
 *
 */
export declare class Rule extends BaseUnusedExpressionRule {
    static metadata: {
        ruleName: string;
        type: Lint.RuleType;
        deprecationMessage?: string | undefined;
        description: string;
        descriptionDetails?: string | undefined;
        hasFix?: boolean | undefined;
        optionsDescription: string;
        options: any;
        optionExamples?: string[] | (true | any[])[] | undefined;
        rationale?: string | undefined;
        requiresTypeInfo?: boolean | undefined;
        typescriptOnly: boolean;
        codeExamples?: Lint.ICodeExample[] | undefined;
    };
    /**
     * Apply rules. Simply walk source by default rule first, and filter out chai expression
     *
     */
    apply(sourceFile: ts.SourceFile): Lint.RuleFailure[];
}