/** `unknown`: the probes disagree, or have nothing to test (no existing
 *  directory, no name with a letter whose case can be swapped). */
export type CaseSensitivity = 'insensitive' | 'sensitive' | 'unknown';
/** How the filesystem holding `p` (an absolute, resolved path) compares
 *  names below its nearest existing directory. `p` itself need not exist. */
export declare function probeCase(p: string): CaseSensitivity;
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