/** Materialize request headers for a Standard Schema boundary.
 *
 * HTTP field names are case-insensitive and `Headers` already combines repeated fields using the
 * platform's defined comma-join behavior. A null-prototype record prevents a hostile field name
 * such as `__proto__` or `constructor` from interacting with Object.prototype before validation.
 */
export declare function headerObjectOf(headers: Headers): Record<string, string>;
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