/** Check an explicit `--store-dir` before anything is written. Its nearest existing part must be a
 *  directory, so a regular file there is a usage refusal that names it, and that directory's chain
 *  is held to the project-root rule for other local writers. A non-empty directory is accepted,
 *  because it may be an existing store. A control directory, or a path in one, is refused unless it
 *  is `root`'s own default store: its files would mix with credentials and records, or with another
 *  root's store, and no reset could remove it alone. */
export declare function assertStoreDirArgument(value: string, root: string): void;
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