export declare function isValidScopeGrant(grant: string): boolean;
/** Exact grants cover only themselves. A terminal :* grant covers its prefix and descendants. */
export declare function scopeGrantCovers(parent: string, child: string): boolean;
export declare function grantsAreCanonical(grants: readonly string[]): boolean;
export declare function scopeNarrows(parent: readonly string[], child: readonly string[]): boolean;
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