/**
 * @fileoverview Symlink-safe intermediate-directory creation for writeInstallFiles.
 * @module @skillsmith/core/services/skill-installation.io.dirs
 * @see SMI-6529 Wave A0 (F4): split out of skill-installation.io.ts to stay
 *   under the 500-line CI gate once the F1-F4 rollback fixes landed — pure
 *   move, no behavior change.
 */
/**
 * Create every path segment of `dir` (relative to `baseDir`) via `ensureDirNoFollow()`,
 * so no intermediate segment can be a pre-existing symlink. `dir` must already be lexically
 * inside `baseDir` — callers are expected to have proven that (as `writeInstallFiles()`'s
 * `installPath` already is, via its own lexical + realpath checks) before calling this.
 */
export declare function mkdirNoFollow(baseDir: string, dir: string, freshDirs: Set<string>): Promise<void>;
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