/**
 * Support the three possible header formats we'd get from a request or
 * response:
 *
 * - A flat array with both names and values: [name, value, name, value, ...]
 * - An object with array values: { name: [value, value] }
 * - An object with string values: { name: value }
 */
export declare function buildHeaders(headers: any): any[];
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