/** @internal Brand a `{ value }` handle so isSignal() recognizes it. */
export declare function markSignal<T extends object>(handle: T): T;
/**
 * Check whether a value is a signal-shaped `{ value }` handle: a
 * primitive-wrapper signal created by `signal(primitive)`, or a property
 * view from `toSignal`/`toSignals`.
 *
 * Returns `false` for object signals (use `isReactive`) and computeds
 * (use `isComputed`).
 *
 * @example
 * ```ts
 * isSignal(signal(0));            // true
 * isSignal(toSignal(state, 'x')); // true
 * isSignal(signal({ x: 1 }));     // false — object signal
 * isSignal({ value: 1 });         // false — plain object
 * ```
 */
export declare function isSignal(value: unknown): value is {
    value: unknown;
};
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