/** The folder `arg` names, without characters a folder can't have or trailing slashes. */
export declare function formatTargetDir(arg: string): string;
export declare function isValidPackageName(name: string): boolean;
/** `name` as a valid package name, or '' when nothing usable remains. The
 *  scope and the name are cleaned separately, so a scope is never lost. */
export declare function toValidPackageName(name: string): string;
/** The package name for the folder `targetDir`: the folder itself when it is
 *  `@scope/name`, else its last segment. Either may not be valid yet. */
export declare function packageNameFor(targetDir: string, cwd: string): string;
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