/**
 * Minimal subscribe contract used by MotionGPU core.
 */
export interface Subscribable<T> {
    subscribe: (run: (value: T) => void) => () => void;
}
/**
 * Readable value with synchronous access to the latest value.
 */
export interface CurrentReadable<T> extends Subscribable<T> {
    readonly current: T;
}
/**
 * Writable extension of {@link CurrentReadable}.
 */
export interface CurrentWritable<T> extends CurrentReadable<T> {
    set: (value: T) => void;
    update: (updater: (value: T) => T) => void;
}
/**
 * Creates a writable value with immediate subscription semantics.
 */
export declare function createCurrentWritable<T>(initialValue: T, onChange?: (value: T) => void): CurrentWritable<T>;
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