/** @module Interface wasi:random/random@0.3.0 **/
/**
 * Return up to `max-len` cryptographically-secure random or pseudo-random
 * bytes.
 * 
 * This function must produce data at least as cryptographically secure and
 * fast as an adequately seeded cryptographically-secure pseudo-random
 * number generator (CSPRNG). It must not block, from the perspective of
 * the calling program, under any circumstances, including on the first
 * request and on requests for numbers of bytes. The returned data must
 * always be unpredictable.
 * 
 * Implementations MAY return fewer bytes than requested (a short read).
 * Callers that require exactly `max-len` bytes MUST call this function in
 * a loop until the desired number of bytes has been accumulated.
 * Implementations MUST return at least 1 byte when `max-len` is greater
 * than zero. When `max-len` is zero, implementations MUST return an empty
 * list without trapping.
 * 
 * This function must always return fresh data. Deterministic environments
 * must omit this function, rather than implementing it with deterministic
 * data.
 */
export function getRandomBytes(maxLen: bigint): Uint8Array;
/**
 * Return a cryptographically-secure random or pseudo-random `u64` value.
 * 
 * This function returns the same type of data as `get-random-bytes`,
 * represented as a `u64`.
 */
export function getRandomU64(): bigint;