import { PackageJson } from 'type-fest';
export declare function readPackageJson(dir: string): null | PackageJson;
export declare function stripExtension(somePath: string): string;
export declare function absolutify(rootDir: string, somePath: string): string;
export declare function assertPathExists(somePath: string, customMessage?: string): void;
export declare function assertDirExists(somePath: string, customMessage?: string): void;
export declare function assertFileExists(somePath: string, customMessage?: string): void;
export declare function assertPathAbsolute(somePath: string, customMessage?: string): void;
export declare function downloadPackageTarball(tarballUrl: string, toFilePath: string): Promise<void>;
export declare function getPackageVersionTarballUrl(packageName: string, packageVersion?: string): Promise<string>;
export declare function downloadPackage({ name, version, downloadDir, }: {
    version?: string;
    name: string;
    downloadDir: string;
}): Promise<void>;
export declare function getPackageMain(packageJson: PackageJson): string;
export declare function JsFilePathToTsDeclarationFilePath(jsFilePath: string): string;
/**
 * Turn the file path into a module path. The difference from a file path
 * is that a module path does not have a file extension and is always in posix format.
 *
 * If the file path is already actually a module path then this is effectively a no-op.
 */
export declare function pathToModulePath(filePath: string): string;
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