/**
 * The one trust boundary for route-owned `<meta>` and `<link>` attributes.
 *
 * Both SSR and soft navigation consume this normalized representation. Keeping policy here prevents
 * the two renderers from disagreeing about whether a descriptor is executable or otherwise unsafe.
 */
export type HeadTag = "meta" | "link";
export type HeadAttributeValue = string | boolean | undefined;
export type TrustedHeadAttribute = readonly [name: string, value: string | true];
/**
 * Normalize one descriptor. `null` means the entire element is unsafe (currently meta refresh).
 * Unknown attributes are dropped: future platform attributes must be reviewed and added explicitly.
 */
export declare function trustedHeadAttributes(tag: HeadTag, attrs: Readonly<object>): readonly TrustedHeadAttribute[] | null;
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