export declare function formatTargetDir(targetDir: string | undefined): string | undefined;
export declare function copy(src: string, dest: string): void;
export declare function isValidPackageName(projectName: string): boolean;
export declare function toValidPackageName(projectName: string): string;
export declare function isEmpty(path: string): boolean;
export declare function emptyDir(dir: string): void;
export declare function pkgFromUserAgent(userAgent: string | undefined): {
    name: string | undefined;
    version: string | undefined;
} | undefined;
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