import { DbAdapter } from './adapter';
import { Commit } from './git';
export declare type TaskType = 'up' | 'down';
export declare class MigrationLoadError extends Error {
    migration: Migration;
    migrationDir: string;
    error: any;
    constructor(migration: Migration, migrationDir: string, error: any);
}
export declare class FirstDownMigrationError extends Error {
    migration: Migration;
    constructor(migration: Migration);
}
export declare class MigrationRunTwiceError extends Error {
    migration: Migration;
    type: 'up' | 'down';
    constructor(migration: Migration, type: 'up' | 'down');
}
export declare class MigrationNotFoundError extends Error {
    migration: Migration;
    migrationDir: string;
    constructor(migration: Migration, migrationDir: string);
}
export declare class TaskTypeNotFoundError extends Error {
    migration: Migration;
    taskType: TaskType;
    migrationDir: string;
    constructor(migration: Migration, taskType: TaskType, migrationDir: string);
}
export declare class MigrationExecutionError extends Error {
    original: any;
    constructor(original: any);
}
export declare class UnknownTaskTypeError extends Error {
    constructor(type: string);
}
export declare class Migration {
    /** The name of the migration */
    name: string;
    constructor(
    /** The name of the migration */
    name: string);
    /**
     * @param migrationDir The migration directory
     */
    getPath(migrationDir: string): Promise<string>;
}
export declare class TaskList extends Array<Task> {
    /**
     * Converts the task list to a string of commands that can be embedded in a commit message
     */
    toString(withComment?: boolean): string;
    execute(migrationDir: string, adapter: DbAdapter, head?: Commit, commit?: Commit): Promise<void>;
}
export declare class Task {
    /** The sequential id of the task entry in the database */
    id: number | undefined;
    /** The function that was executed */
    type: TaskType;
    /** The migration that was run */
    migration: Migration;
    /** The commit that triggered the task, if triggered by a commit */
    commit?: Commit;
    /** The git HEAD at the time the task was executed */
    head?: Commit;
    /** The date when the migration was applied if already executed */
    appliedAt?: Date;
    constructor(options: {
        id?: number;
        type: TaskType;
        migration: Migration;
        commit?: Commit;
        head?: Commit;
        appliedAt?: Date;
    });
    invert(): Task;
    /**
     * Executes the task
     * @param migrationDir the fallback folder to search the migration in if no merkelrc can be found
     */
    execute(migrationDir: string, adapter: DbAdapter, head?: Commit, commit?: Commit): Promise<void>;
    /**
     * Converts the task to a short string including the type and migration name that can be shown
     * in the CLI
     */
    toString(): string;
}