export interface AllocU32Options {
    /** When true and the runtime allows it, back the array with a SharedArrayBuffer. */
    readonly shared?: boolean;
    /**
     * Reserve a resizable backing whose view widens on `.grow()` up to `maxLength` elements.
     * Omit for a fixed-size, non-resizable buffer.
     */
    readonly maxLength?: number;
}
export interface U32Region {
    /**
     * Length-tracking on a resizable backing (re-derives its length on `.grow()`), or fixed-size
     * over a non-resizable backing. Never constructed with an explicit length argument over a
     * resizable buffer.
     */
    readonly view: Uint32Array;
    readonly backing: ArrayBufferLike;
    readonly shared: boolean;
    /** Current element capacity (`backing.byteLength / 4`). */
    capacity(): number;
    /** Grow the backing to at least `length` elements. No-op if already large enough. */
    grow(length: number): void;
}
export declare function allocU32(length: number, opts?: AllocU32Options): U32Region;
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