import { Client, Context } from "./pg";
import { ParsedSettings } from "./settings";
export interface Migration {
    /**
     * The filename without the message slug in it, used for storing to the database.
     */
    filename: string;
    /**
     * A hash of the content of the migration.
     */
    hash: string;
    /**
     * The hash of the previous migration, or null if there was no previous migration
     */
    previousHash: string | null;
    /**
     * True if we should allow the hash to be invalid; false otherwise.
     */
    allowInvalidHash: boolean;
}
export interface DbMigration extends Migration {
    date: Date;
}
export interface FileMigration extends Migration {
    /**
     * The actual filename on disk
     */
    realFilename: string;
    /**
     * The content of the migration
     */
    body: string;
    /**
     * The message the migration was committed with
     */
    message: string | null;
    /**
     * The slugified message, stored as part of the file name
     */
    messageSlug: string | null;
    /**
     * The full path to this migration on disk
     */
    fullPath: string;
    /**
     * If there was a previous migration, that
     */
    previous: FileMigration | null;
}
export declare const slowGeneratePlaceholderReplacement: (parsedSettings: ParsedSettings, { database }: Context) => (str: string) => string;
export declare const generatePlaceholderReplacement: (parsedSettings: ParsedSettings, __1: Context) => (str: string) => string;
export declare function compilePlaceholders(parsedSettings: ParsedSettings, content: string, shadow?: boolean): string;
export declare function _migrateMigrationSchema(pgClient: Client, parsedSettings: ParsedSettings): Promise<void>;
export declare function parseMigrationText(fullPath: string, contents: string, 
/**
 * Should be set true for committed migrations - requires that there is a \n\n divide after the header
 */
strict?: boolean): {
    headers: {
        [key: string]: string | null;
    };
    body: string;
};
export declare function serializeHeader(key: string, value: string | null): string;
export declare function serializeMigration(body: string, headers: {
    [key: string]: string | null | undefined;
}): string;
export declare const isMigrationFilename: (filename: string) => RegExpMatchArray | null;
export declare function getLastMigration(pgClient: Client, parsedSettings: ParsedSettings): Promise<DbMigration | null>;
export declare function getAllMigrations(parsedSettings: ParsedSettings): Promise<Array<FileMigration>>;
export declare function getMigrationsAfter(parsedSettings: ParsedSettings, previousMigration: Migration | null): Promise<Array<FileMigration>>;
export declare function runStringMigration(pgClient: Client, parsedSettings: ParsedSettings, context: Context, rawBody: string, filename: string, committedMigration?: FileMigration, dryRun?: boolean): Promise<{
    sql: string;
    transaction: boolean;
}>;
export declare function undoMigration(parsedSettings: ParsedSettings, committedMigration: FileMigration): Promise<void>;
export declare function runCommittedMigration(pgClient: Client, parsedSettings: ParsedSettings, context: Context, committedMigration: FileMigration, logSuffix: string): Promise<void>;
export declare function reverseMigration(pgClient: Client, _body: string): Promise<void>;