export declare const InvalidCapacityErrorSym: unique symbol;
export declare class InvalidCapacityError extends Error {
    readonly [InvalidCapacityErrorSym] = "InvalidCapacityError";
    constructor(message?: string);
}
export declare function ensureCapacity(capacity: number): asserts capacity;
export declare function isInvalidCapacityError(u: unknown): u is InvalidCapacityError;
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