/**
 * The URL-scheme rule: which attributes carry a URL, and what a written one is
 * refused for.
 *
 * D115 P4 R3a: one question about one string — asked of a literal `href`, of a
 * JSX attribute value, and of an interpolation's parts — so it is written once
 * here rather than in the middle of the analyzer's JSX pass.
 */
export declare const WEB_URL_ATTRIBUTES: Set<string>;
/** The clause naming why one literal URL is refused, or null when it is fine. */
export declare function urlSchemeRefusal(value: string): string | null;
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