/** Generates a random URL-safe PKCE code verifier. Treat it as a temporary secret. */
export declare function generatePkceCodeVerifier(): string;
/**
 * Creates a PKCE verifier and its SHA-256 challenge.
 *
 * Send `challenge` and `method` in the authorization request. Send `verifier`
 * only to the token endpoint.
 */
export declare class PKCE extends String {
    /** Creates a new random verifier. */
    constructor();
    /** Returns the PKCE code challenge. */
    get challenge(): string;
    /** Returns the PKCE challenge method. */
    get method(): string;
    /** Returns the PKCE code verifier. */
    get verifier(): string;
}
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