import chex from '@darkobits/chex';
import { type NormalizedPackageJson, type Options } from 'read-pkg-up';
import { ThenArg } from "../etc/types";
/**
 * If the provided value is an array, it is returned as-is. Otherwise, the value
 * is wrapped in an array and returned.
 */
export declare function ensureArray<T = any>(value: any): Array<T>;
/**
 * Provided a string (or an array of strings), returns a string of label
 * arguments suitable for passing to `docker build`.
 */
export declare function parseLabels(labels: any): string;
/**
 * Object returned by `pkgInfo`.
 */
export interface PkgInfoResult {
    /**
     * Object containing the parsed/normalized contents of the package's
     * package.json.
     */
    json: NormalizedPackageJson;
    /**
     * Root directory of the package.
     *
     * Note: This is _not_ the path to its package.json.
     */
    root: string;
}
/**
 * Wraps `readPackageUp` and automatically throws if a package.json file could
 * not be found.
 */
export declare function pkgInfo(cwd: Options['cwd']): Promise<PkgInfoResult>;
/**
 * Provided a normalized package.json object, returns its first "bin" entry or,
 * if the package does not declare a "bin", its "main" entry.
 */
export declare function computePackageEntry(pkg: NormalizedPackageJson): string;
/**
 * Provided a base image name and a package.json object, computes a final image
 * name to use and then validates it.
 */
export declare function computeTag(tagFromOptions: string | undefined, packageJson: NormalizedPackageJson): string;
export interface RenderTemplateOptions {
    template: string;
    dest: string;
    data: any;
}
/**
 * Provided a path to an EJS template and a data object, returns a string
 * representing the rendered template.
 */
export declare function renderTemplate({ template, dest, data }: RenderTemplateOptions): Promise<void>;
/**
 * Provided a package's root directory and a target directory, gets a pack list
 * and copies all files therein to the provided destination directory.
 */
export declare function copyPackFiles(pkgRoot: string, destDir: string): Promise<void>;
/**
 * Provided a package's root directory and a target directory, determines if the
 * package has a 'package-lock.json' and, if so, copies it to the target
 * directory.
 *
 * Returns true if the a lockfile was copied and false otherwise.
 */
export declare function copyPackageLockfile(pkgRoot: string, destDir: string): Promise<boolean>;
/**
 * Provided an `npmrc` option from the Dockerize function, finds the appropriate
 * .npmrc file and copies it to the indicated destination directory.
 */
export declare function copyNpmrc(npmrcOption: string | undefined, destDir: string): Promise<boolean>;
/**
 * Provided a Docker image name, returns its size.
 */
export declare function getImageSize(docker: ThenArg<ReturnType<typeof chex>>, imageName: string): Promise<string>;
/**
 * Returns the current LTS version of NodeJS.
 */
export declare function getNodeLtsVersion(): Promise<string>;