/**
 * `fetch` with a timeout abort signal merged onto the caller's own signal.
 * The default timeout is 15s. Pass `Infinity` to disable the timeout
 * (the caller's own `signal` still applies). Passing `0` aborts
 * immediately — almost never what you want — so we treat any
 * non-positive value as "no timeout" to avoid the footgun.
 *
 * **Lockstep duplicate** of `vault/clients/shared/src/utils/fetch.ts`.
 * `@vault/shared` is the vault-specific lower layer; `@entropy-softworks/ui`
 * is the cross-portfolio UI package. Neither can depend on the other
 * (shared → ui would invert layering; ui → shared would chain every
 * downstream Entropy Softworks app to vault). The function is small,
 * pure, and stable; keep both copies byte-identical and update both
 * when changing.
 */
export declare function fetchWithTimeout(url: string, options?: RequestInit, timeoutMs?: number): Promise<Response>;
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