import * as nunjucks from 'nunjucks';
export interface OutputAdaptor {
    appendLine(text: string): void;
    show(): void;
}
export declare class PreProcessingError implements Error {
    readonly message: string;
    readonly line: number;
    readonly column: number;
    stack?: string;
    constructor(message: string, line: number, column: number);
    get name(): string;
}
export declare abstract class PreProcessor {
    protected metaDataLine?: string | undefined;
    readonly metaDataLineOffset?: number | undefined;
    constructor(metaDataLine?: string | undefined, metaDataLineOffset?: number | undefined);
    abstract transform(input: string, workingDirectory: string, outputWindow: OutputAdaptor): Promise<string>;
    abstract toString(): string;
    abstract getInputFiles(): string[];
    abstract getLabel(): string;
    protected removeMetaDataLine(text: string): string;
}
/**
 * Shell command based pre-processor.
 */
export declare class CommandPreProcessor extends PreProcessor {
    private command;
    protected args: string[];
    constructor(command: string, args: string[], metaDataLine?: string, metaDataLineOffset?: number);
    toString(): string;
    static fromJson(json: never): PreProcessor;
    getInputFiles(): string[];
    getLabel(): string;
    handleError(error: Error): void;
    handleErrorAsync(error: Error, reject: (message: any) => void): void;
    transform(input: string, workingDirectory: string, outputWindow: OutputAdaptor): Promise<string>;
}
/**
 * Python-based pre-processor
 */
export declare class PythonPreProcessor extends CommandPreProcessor {
    constructor(pythonPath: string, script: string, args: string[], metaDataLine?: string, metaDataLineOffset?: number);
    getInputFiles(): string[];
    getLabel(): string;
    static fromJson(_json: never): PreProcessor;
    private static readonly JINJA2_TEMPLATE_SYNTAX_ERROR_PREFIX;
    private static readonly PYTHON_JSON_DECODER;
    handleErrorAsync(error: Error, reject: (message: any) => void): void;
}
/**
 * Jinja2 pre-processor
 */
export declare class Jinja2PreProcessor extends PythonPreProcessor {
    dataFileName: string;
    constructor(pythonPath: string, extensionRoot: string, dataFileName: string, metaDataLine?: string, metaDataLineOffset?: number);
    static fromJson(_json: unknown): PreProcessor;
    getInputFiles(): string[];
    getLabel(): string;
}
/**
 * Nunjucks based pre-processor
 */
export declare class NunjucksPreProcessor extends PreProcessor {
    dataFileName: string;
    nunjucksEnv: nunjucks.Environment;
    constructor(dataFileName: string, metaDataLine: string | undefined, metaDataLineOffset: number, preserveWhitespace: boolean);
    getInputFiles(): string[];
    getLabel(): string;
    toString(): string;
    transform(input: string, workingDirectory: string, _outputWindow: OutputAdaptor): Promise<string>;
}