/**
 * Builds a storage namespace bound to `prefix`. Every signal the
 * returned factory creates persists under `prefix + key` in the
 * default storage area: `localStorage`, falling back to
 * `sessionStorage`, then to an in-memory shim.
 *
 * ```js
 * const store = storage('my-app:')
 * const dark = store('dark', false)
 * dark.read()
 * dark.write(true)
 * dark.update(v => !v)
 * ```
 *
 * Each call returns a regular pota `signal()` object — `.read()`,
 * `.write(value)`, `.update(prev => next)`. The initial value comes
 * from storage when present, falling back to `initial`. Signals for
 * the same key stay in sync within the same document, and
 * browser-backed stores also react to `storage` events from other
 * tabs. Storage writes are wrapped in try/catch so quota and
 * private-mode failures are silently ignored — the signal still
 * behaves correctly in-memory.
 *
 * @param {string} prefix Prefix prepended to every key (caller picks
 *   the separator, e.g. `'my-app:'` or `'my-app/'`).
 * @url https://pota.quack.uy/use/storage
 */
export function storage(prefix: string): (key: string, initial?: T) => Signal<T>;
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