/**
 * Extracts external dependency information from esbuild metafiles.
 *
 * Parses esbuild's metafile JSON to find all node_modules references,
 * then resolves their exact versions from the project's package.json
 * and/or yarn.lock to produce a minimal package.json.
 */
import type { Metafile } from 'esbuild';
/**
 * Extracts bare package names from esbuild metafile imports.
 *
 * When esbuild runs with `packages: 'external'`, external imports appear
 * in the metafile's outputs[].imports array with `external: true`.
 * This function collects all unique package names from those imports.
 */
export declare function extractExternalPackages(metafile: Metafile): Set<string>;
/**
 * Parses a bare import specifier into a package name.
 *
 * Handles scoped packages (`@scope/pkg`) and deep imports (`pkg/sub/path`).
 * Returns null for relative imports or other non-package specifiers.
 */
export declare function parsePackageName(specifier: string): string | null;
/**
 * Resolves exact versions for a set of external package names.
 *
 * Shared by both bundler backends: esbuild derives the set from its metafile
 * (`extractExternalPackages`), while the Bun.build backend captures it via a
 * resolve plugin (Bun's metafile does not record external imports).
 */
export declare function resolveExternalVersions(externalPackages: Set<string>, projectDir: string): Promise<{
    exactDependencies: Record<string, string>;
    exactOptionalDependencies: Record<string, string>;
}>;
/**
 * Given an esbuild metafile, extracts all external packages and resolves
 * their versions from the project's dependency files.
 */
export declare function extractDependencies(metafile: Metafile, projectDir: string): Promise<{
    exactDependencies: Record<string, string>;
    exactOptionalDependencies: Record<string, string>;
}>;
/**
 * Generates a minimal package.json content object for a unit bundle.
 */
export declare function generateMinimalPackageJson(unitName: string, dependencies: Record<string, string>, optionalDependencies: Record<string, string>): Record<string, unknown>;