/**
 * Verify PKCE code challenge.
 * Throws an error if verification fails.
 *
 * @param codeVerifier The PKCE code verifier.
 * @param codeChallenge The stored code challenge.
 * @param method The code challenge method (S256 or plain).
 */
export declare function verifyPKCE(codeVerifier: string, codeChallenge: string, method: string): void;
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