/** Installs the default outbound fetch timeout once for this runtime. */
export declare function install(): void;
/** Adds a default maximum duration to fetch calls that do not carry a signal. */
export declare function withTimeout(fetch: typeof globalThis.fetch, options: withTimeout.Options): typeof globalThis.fetch;
/** Resolves a caller signal or creates the default fetch deadline signal. */
export declare function resolveSignal(input: Parameters<typeof globalThis.fetch>[0], options: resolveSignal.Options): AbortSignal;
export declare namespace resolveSignal {
    /** Options for {@link resolveSignal}. */
    type Options = {
        /** Optional fetch initialization carrying a caller signal. */
        init?: Parameters<typeof globalThis.fetch>[1];
        /** Default maximum duration in milliseconds. */
        timeout: number;
    };
}
export declare namespace withTimeout {
    /** Options for {@link withTimeout}. */
    type Options = {
        /** Maximum fetch duration in milliseconds. */
        timeout: number;
    };
}
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