export declare const DEVELOPMENT_MODE: boolean;
export declare const isTs: RegExp;
export declare const isJs: RegExp;
export declare const isTsxOrJsx: RegExp;
export declare const BASE_CONFIG: {
    format: string;
    charset: string;
    sourcemap: string;
    target: string;
    minify: boolean;
};
export declare type ModuleLoaders = {
    [extension: string]: {
        [configKey: string]: unknown;
    };
};
export declare const MODULE_LOADERS: ModuleLoaders;
export declare const POSSIBLE_EXTENSIONS: string[];
/**
 * Force a Unix-like path.
 */
export declare const normalizeSpecifier: (path: string) => string;
export declare const fileExists: (fileUrl: string) => string | void;
export declare const fileExistsAny: (fileUrls: string[]) => string | void;
export declare const checkTsExtensions: (specifier: string) => string | void;
export declare const checkJsExtension: (specifier: string) => string | void;
export declare const checkExtensions: (specifier: string) => string;