/** Largest value that fits in a 1-byte varint (6 bits). */
export declare const MAX_U6: number;
/** Largest value that fits in a 2-byte varint (14 bits). */
export declare const MAX_U14: number;
/** Largest value that fits in a 4-byte varint (30 bits). */
export declare const MAX_U30: number;
/** Largest value representable without precision loss (`Number.MAX_SAFE_INTEGER`, 53 bits). */
export declare const MAX_U53: number;
/** Number of bytes needed to encode a value in the leading-ones varint format. */
export declare function sizeLeadingOnes(v: number | bigint): number;
/** Encode a value in leading-ones varint format into the provided buffer, returning the written subarray. */
export declare function encodeLeadingOnesTo(dst: ArrayBuffer, v: number | bigint): Uint8Array;
/** Encode a value in leading-ones varint format into a freshly allocated buffer. */
export declare function encodeLeadingOnes(v: number | bigint): Uint8Array;
/** Decode a leading-ones varint, returning the value and the remaining buffer. */
export declare function decodeLeadingOnes(buf: Uint8Array): [bigint, Uint8Array];
/**
 * Returns the number of bytes needed to encode a value as a varint.
 */
export declare function size(v: number): number;
/**
 * Encodes a number or bigint into a scratch buffer.
 * Used by stream.ts to avoid allocations.
 */
export declare function encodeTo(dst: ArrayBuffer, v: number | bigint): Uint8Array;
/**
 * Encodes a number as a QUIC variable-length integer.
 * Returns a new Uint8Array containing the encoded bytes.
 */
export declare function encode(v: number): Uint8Array;
/**
 * Decodes a QUIC variable-length integer from a buffer.
 * Returns a tuple of [value, remaining buffer].
 */
export declare function decode(buf: Uint8Array): [number, Uint8Array];
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