/**
 * Get the implementation of the `getMnemonic` method.
 *
 * @param defaultSecretRecoveryPhrase - The default secret recovery phrase to
 * use.
 * @returns The implementation of the `getMnemonic` method.
 */
export declare function getGetMnemonicImplementation(defaultSecretRecoveryPhrase?: string): (source?: string | undefined) => Promise<Uint8Array>;
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