/**
 * The decoded link: the WAS server plus the controller secret AS A STRING.
 */
export interface WasLinkPayload {
    serverUrl: string;
    /**
     * The controller secret (already decoded back to the passphrase string).
     */
    secret: string;
}
/**
 * The `t` discriminator member every `was-link` payload carries.
 */
export declare const WAS_LINK_TYPE = "was-link";
/**
 * Whether some scanned or pasted text has a `was-link` payload's JSON shape.
 * Matched structurally on the `t` member rather than by calling the parser,
 * so an unrelated JSON blob is not refused with a connection-code error
 * message. This is the recognizer a wallet hands `@interop/wallet-request`'s
 * input classifier for its `was-link` branch; whether the payload is valid
 * is {@link parseWasLinkPayload}'s answer.
 *
 * @param text {string}
 * @returns {boolean}
 */
export declare function isWasLinkPayload(text: string): boolean;
/**
 * Encodes a passphrase into the payload's `secret` field: `base64url(utf8(...))`,
 * no padding.
 *
 * @param passphrase {string}
 * @returns {string}
 */
export declare function encodeWasLinkSecret(passphrase: string): string;
/**
 * Builds the full `was-link` payload string a QR encodes.
 *
 * @param options {object}
 * @param options.serverUrl {string}
 * @param options.passphrase {string}
 * @returns {string}
 */
export declare function buildWasLinkPayload({ serverUrl, passphrase }: {
    serverUrl: string;
    passphrase: string;
}): string;
/**
 * Parses and validates a scanned payload, returning the server URL and the
 * decoded string secret. Throws {@link HumanReadableError} for anything that is
 * not a valid current-version `was-link` payload (so the scanner shows a clean
 * message rather than mis-handling an unrelated QR).
 *
 * @param raw {string}   the raw scanned code value
 * @returns {WasLinkPayload}
 */
export declare function parseWasLinkPayload(raw: string): WasLinkPayload;
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