/** The first statement of `runCli`. When `MANAGED_HANDOFF_FILE_ENV` is set under any letter case,
 *  delete every such key from `env`, then run `takeManagedHandoffFile` on each distinct path it
 *  names and hold the text in this module. Spellings that name different files are refused, after
 *  every one of them was taken, so no file survives the ambiguity. A refusal prints one line naming
 *  the check and exits 1. With the variable absent it does nothing. */
export declare function takeManagedHandoffCustody(env: Record<string, string | undefined>): void;
/** Whether custody holds a handoff, without handing it over. Spawn's argument check reads this,
 *  because custody already removed the variable it would otherwise see. */
export declare function holdsManagedHandoff(): boolean;
/** The text custody holds, handed over once. A later call returns undefined. Only the spawn
 *  handler calls it. */
export declare function claimManagedHandoff(): string | undefined;
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