export declare type TransformerType = (value: any) => any;
export declare type Middleware = (records: string[], columns: string[]) => string[];
export declare type ExecuterInstructions = [Middleware, ColumnTypes];
export declare type Operation = 'SKIP:MASK' | 'SKIP:OUTPUT';
export interface TableTypes {
    [table_name: string]: {
        [column_name: string]: TransformerType;
    } | ExecuterInstructions;
}
export interface __TableOperationType {
    [table_name: string]: Operation | ColumnTypes | ExecuterInstructions;
}
export interface ColumnTypes {
    [column_name: string]: TransformerType;
}
export interface OptionsType {
    skip?: {
        [table_name: string]: 'output' | 'mask';
    };
}
export interface ConfigurationType {
    connectionUrl: string;
    tables?: TableTypes;
    defaultTransformer?: TransformerType;
    columns?: ColumnTypes;
    options?: OptionsType;
}
export declare enum VerbosityLevel {
    verbose = 0,
    info = 1,
    silent = 2
}
export interface AbstractOperationType {
    aoo: {
        tables?: __TableOperationType;
        columns?: ColumnTypes;
        defaultTransformer?: TransformerType;
    };
}
export interface WriteableStream {
    write: (text: string) => void;
}
export interface EngineCache {
    tableName: string;
    columns?: Array<string>;
    transformers?: ColumnTypes | ExecuterInstructions | null;
}
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