_buffer.d.ts

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Copyright DefinitelyTyped contributors. All rights reserved. MIT license.

/**
 * One of many allowed encodings for the buffer content
 * - ascii
 * - base64
 * - base64url
 * - binary
 * - hex
 * - latin1
 * - ucs-2
 * - ucs2
 * - utf-8
 * - utf16le
 * - utf8
 */
type Encoding = unknown;

type WithImplicitCoercion<T> =
  | T
  | {
    valueOf(): T;
  };

/**
 * `Buffer` objects are used to represent a fixed-length sequence of bytes. Many
 * Node.js APIs support `Buffer`s.
 *
 * The `Buffer` class is a subclass of JavaScript's [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) class and
 * extends it with methods that cover additional use cases. Node.js APIs accept
 * plain [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) s wherever `Buffer`s are supported as well.
 *
 * While the `Buffer` class is available within the global scope, it is still
 * recommended to explicitly reference it via an import or require statement.
 *
 * ```js
 * import { Buffer } from 'buffer';
 *
 * // Creates a zero-filled Buffer of length 10.
 * const buf1 = Buffer.alloc(10);
 *
 * // Creates a Buffer of length 10,
 * // filled with bytes which all have the value `1`.
 * const buf2 = Buffer.alloc(10, 1);
 *
 * // Creates an uninitialized buffer of length 10.
 * // This is faster than calling Buffer.alloc() but the returned
 * // Buffer instance might contain old data that needs to be
 * // overwritten using fill(), write(), or other functions that fill the Buffer's
 * // contents.
 * const buf3 = Buffer.allocUnsafe(10);
 *
 * // Creates a Buffer containing the bytes [1, 2, 3].
 * const buf4 = Buffer.from([1, 2, 3]);
 *
 * // Creates a Buffer containing the bytes [1, 1, 1, 1] – the entries
 * // are all truncated using `(value &#x26; 255)` to fit into the range 0–255.
 * const buf5 = Buffer.from([257, 257.5, -255, '1']);
 *
 * // Creates a Buffer containing the UTF-8-encoded bytes for the string 'tést':
 * // [0x74, 0xc3, 0xa9, 0x73, 0x74] (in hexadecimal notation)
 * // [116, 195, 169, 115, 116] (in decimal notation)
 * const buf6 = Buffer.from('tést');
 *
 * // Creates a Buffer containing the Latin-1 bytes [0x74, 0xe9, 0x73, 0x74].
 * const buf7 = Buffer.from('tést', 'latin1');
 * ```
 * @see [source](https://github.com/nodejs/node/blob/v16.9.0/lib/buffer.js)
 */
export class Buffer extends Uint8Array {
  /**
   * Allocates a new buffer containing the given {str}.
   *
   * @param str String to store in buffer.
   * @param encoding encoding to use, optional.  Default is 'utf8'
   * @deprecated since v10.0.0 - Use `Buffer.from(string[, encoding])` instead.
   */
  constructor(str: string, encoding?: Encoding);
  /**
   * Allocates a new buffer of {size} octets.
   *
   * @param size count of octets to allocate.
   * @deprecated since v10.0.0 - Use `Buffer.alloc()` instead (also see `Buffer.allocUnsafe()`).
   */
  constructor(size: number);
  /**
   * Allocates a new buffer containing the given {array} of octets.
   *
   * @param array The octets to store.
   * @deprecated since v10.0.0 - Use `Buffer.from(array)` instead.
   */
  constructor(array: Uint8Array);
  /**
   * Produces a Buffer backed by the same allocated memory as
   * the given {ArrayBuffer}/{SharedArrayBuffer}.
   *
   * @param arrayBuffer The ArrayBuffer with which to share memory.
   * @deprecated since v10.0.0 - Use `Buffer.from(arrayBuffer[, byteOffset[, length]])` instead.
   */
  constructor(arrayBuffer: ArrayBuffer | SharedArrayBuffer);
  /**
   * Allocates a new buffer containing the given {array} of octets.
   *
   * @param array The octets to store.
   * @deprecated since v10.0.0 - Use `Buffer.from(array)` instead.
   */
  constructor(array: ReadonlyArray<unknown>);
  /**
   * Copies the passed {buffer} data onto a new {Buffer} instance.
   *
   * @param buffer The buffer to copy.
   * @deprecated since v10.0.0 - Use `Buffer.from(buffer)` instead.
   */
  constructor(buffer: Buffer);
  /**
   * Allocates a new `Buffer` using an `array` of bytes in the range `0` – `255`.
   * Array entries outside that range will be truncated to fit into it.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Creates a new Buffer containing the UTF-8 bytes of the string 'buffer'.
   * const buf = Buffer.from([0x62, 0x75, 0x66, 0x66, 0x65, 0x72]);
   * ```
   *
   * A `TypeError` will be thrown if `array` is not an `Array` or another type
   * appropriate for `Buffer.from()` variants.
   *
   * `Buffer.from(array)` and `Buffer.from(string)` may also use the internal`Buffer` pool like `Buffer.allocUnsafe()` does.
   * @since v5.10.0
   */
  static from(
    arrayBuffer: WithImplicitCoercion<ArrayBuffer | SharedArrayBuffer>,
    byteOffset?: number,
    length?: number,
  ): Buffer;
  /**
   * Creates a new Buffer using the passed {data}
   * @param data data to create a new Buffer
   */
  static from(data: Uint8Array | ReadonlyArray<number>): Buffer;
  static from(
    data: WithImplicitCoercion<Uint8Array | ReadonlyArray<number> | string>,
  ): Buffer;
  /**
   * Creates a new Buffer containing the given JavaScript string {str}.
   * If provided, the {encoding} parameter identifies the character encoding.
   * If not provided, {encoding} defaults to 'utf8'.
   */
  static from(
    str:
      | WithImplicitCoercion<string>
      | {
        [Symbol.toPrimitive](hint: "string"): string;
      },
    encoding?: Encoding,
  ): Buffer;
  /**
   * Creates a new Buffer using the passed {data}
   * @param values to create a new Buffer
   */
  static of(...items: number[]): Buffer;
  /**
   * Returns `true` if `obj` is a `Buffer`, `false` otherwise.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * Buffer.isBuffer(Buffer.alloc(10)); // true
   * Buffer.isBuffer(Buffer.from('foo')); // true
   * Buffer.isBuffer('a string'); // false
   * Buffer.isBuffer([]); // false
   * Buffer.isBuffer(new Uint8Array(1024)); // false
   * ```
   * @since v0.1.101
   */
  static isBuffer(obj: unknown): obj is Buffer;
  /**
   * Returns `true` if `encoding` is the name of a supported character encoding,
   * or `false` otherwise.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * console.log(Buffer.isEncoding('utf8'));
   * // Prints: true
   *
   * console.log(Buffer.isEncoding('hex'));
   * // Prints: true
   *
   * console.log(Buffer.isEncoding('utf/8'));
   * // Prints: false
   *
   * console.log(Buffer.isEncoding(''));
   * // Prints: false
   * ```
   * @since v0.9.1
   * @param encoding A character encoding name to check.
   */
  static isEncoding(encoding: string): boolean;
  /**
   * Returns the byte length of a string when encoded using `encoding`.
   * This is not the same as [`String.prototype.length`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length), which does not account
   * for the encoding that is used to convert the string into bytes.
   *
   * For `'base64'`, `'base64url'`, and `'hex'`, this function assumes valid input.
   * For strings that contain non-base64/hex-encoded data (e.g. whitespace), the
   * return value might be greater than the length of a `Buffer` created from the
   * string.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const str = '\u00bd + \u00bc = \u00be';
   *
   * console.log(`${str}: ${str.length} characters, ` +
   *             `${Buffer.byteLength(str, 'utf8')} bytes`);
   * // Prints: ½ + ¼ = ¾: 9 characters, 12 bytes
   * ```
   *
   * When `string` is a
   * `Buffer`/[`DataView`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView)/[`TypedArray`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/-
   * Reference/Global_Objects/TypedArray)/[`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer)/[`SharedArrayBuffer`](https://develop-
   * er.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer), the byte length as reported by `.byteLength`is returned.
   * @since v0.1.90
   * @param string A value to calculate the length of.
   * @param [encoding='utf8'] If `string` is a string, this is its encoding.
   * @return The number of bytes contained within `string`.
   */
  static byteLength(
    string:
      | string
      | ArrayBufferView
      | ArrayBuffer
      | SharedArrayBuffer,
    encoding?: Encoding,
  ): number;
  /**
   * Returns a new `Buffer` which is the result of concatenating all the `Buffer`instances in the `list` together.
   *
   * If the list has no items, or if the `totalLength` is 0, then a new zero-length`Buffer` is returned.
   *
   * If `totalLength` is not provided, it is calculated from the `Buffer` instances
   * in `list` by adding their lengths.
   *
   * If `totalLength` is provided, it is coerced to an unsigned integer. If the
   * combined length of the `Buffer`s in `list` exceeds `totalLength`, the result is
   * truncated to `totalLength`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Create a single `Buffer` from a list of three `Buffer` instances.
   *
   * const buf1 = Buffer.alloc(10);
   * const buf2 = Buffer.alloc(14);
   * const buf3 = Buffer.alloc(18);
   * const totalLength = buf1.length + buf2.length + buf3.length;
   *
   * console.log(totalLength);
   * // Prints: 42
   *
   * const bufA = Buffer.concat([buf1, buf2, buf3], totalLength);
   *
   * console.log(bufA);
   * // Prints: <Buffer 00 00 00 00 ...>
   * console.log(bufA.length);
   * // Prints: 42
   * ```
   *
   * `Buffer.concat()` may also use the internal `Buffer` pool like `Buffer.allocUnsafe()` does.
   * @since v0.7.11
   * @param list List of `Buffer` or {@link Uint8Array} instances to concatenate.
   * @param totalLength Total length of the `Buffer` instances in `list` when concatenated.
   */
  static concat(
    list: ReadonlyArray<Uint8Array>,
    totalLength?: number,
  ): Buffer;
  /**
   * Compares `buf1` to `buf2`, typically for the purpose of sorting arrays of`Buffer` instances. This is equivalent to calling `buf1.compare(buf2)`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from('1234');
   * const buf2 = Buffer.from('0123');
   * const arr = [buf1, buf2];
   *
   * console.log(arr.sort(Buffer.compare));
   * // Prints: [ <Buffer 30 31 32 33>, <Buffer 31 32 33 34> ]
   * // (This result is equal to: [buf2, buf1].)
   * ```
   * @since v0.11.13
   * @return Either `-1`, `0`, or `1`, depending on the result of the comparison. See `compare` for details.
   */
  static compare(buf1: Uint8Array, buf2: Uint8Array): number;
  /**
   * Allocates a new `Buffer` of `size` bytes. If `fill` is `undefined`, the`Buffer` will be zero-filled.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.alloc(5);
   *
   * console.log(buf);
   * // Prints: <Buffer 00 00 00 00 00>
   * ```
   *
   * If `size` is larger than {@link constants.MAX_LENGTH} or smaller than 0, `ERR_INVALID_ARG_VALUE` is thrown.
   *
   * If `fill` is specified, the allocated `Buffer` will be initialized by calling `buf.fill(fill)`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.alloc(5, 'a');
   *
   * console.log(buf);
   * // Prints: <Buffer 61 61 61 61 61>
   * ```
   *
   * If both `fill` and `encoding` are specified, the allocated `Buffer` will be
   * initialized by calling `buf.fill(fill, encoding)`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.alloc(11, 'aGVsbG8gd29ybGQ=', 'base64');
   *
   * console.log(buf);
   * // Prints: <Buffer 68 65 6c 6c 6f 20 77 6f 72 6c 64>
   * ```
   *
   * Calling `Buffer.alloc()` can be measurably slower than the alternative `Buffer.allocUnsafe()` but ensures that the newly created `Buffer` instance
   * contents will never contain sensitive data from previous allocations, including
   * data that might not have been allocated for `Buffer`s.
   *
   * A `TypeError` will be thrown if `size` is not a number.
   * @since v5.10.0
   * @param size The desired length of the new `Buffer`.
   * @param [fill=0] A value to pre-fill the new `Buffer` with.
   * @param [encoding='utf8'] If `fill` is a string, this is its encoding.
   */
  static alloc(
    size: number,
    fill?: string | Uint8Array | number,
    encoding?: Encoding,
  ): Buffer;
  /**
   * Allocates a new `Buffer` of `size` bytes. If `size` is larger than {@link constants.MAX_LENGTH} or smaller than 0, `ERR_INVALID_ARG_VALUE` is thrown.
   *
   * The underlying memory for `Buffer` instances created in this way is _not_
   * _initialized_. The contents of the newly created `Buffer` are unknown and_may contain sensitive data_. Use `Buffer.alloc()` instead to initialize`Buffer` instances with zeroes.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(10);
   *
   * console.log(buf);
   * // Prints (contents may vary): <Buffer a0 8b 28 3f 01 00 00 00 50 32>
   *
   * buf.fill(0);
   *
   * console.log(buf);
   * // Prints: <Buffer 00 00 00 00 00 00 00 00 00 00>
   * ```
   *
   * A `TypeError` will be thrown if `size` is not a number.
   *
   * The `Buffer` module pre-allocates an internal `Buffer` instance of
   * size `Buffer.poolSize` that is used as a pool for the fast allocation of new`Buffer` instances created using `Buffer.allocUnsafe()`,`Buffer.from(array)`, `Buffer.concat()`, and the
   * deprecated`new Buffer(size)` constructor only when `size` is less than or equal
   * to `Buffer.poolSize >> 1` (floor of `Buffer.poolSize` divided by two).
   *
   * Use of this pre-allocated internal memory pool is a key difference between
   * calling `Buffer.alloc(size, fill)` vs. `Buffer.allocUnsafe(size).fill(fill)`.
   * Specifically, `Buffer.alloc(size, fill)` will _never_ use the internal `Buffer`pool, while `Buffer.allocUnsafe(size).fill(fill)`_will_ use the internal`Buffer` pool if `size` is less
   * than or equal to half `Buffer.poolSize`. The
   * difference is subtle but can be important when an application requires the
   * additional performance that `Buffer.allocUnsafe()` provides.
   * @since v5.10.0
   * @param size The desired length of the new `Buffer`.
   */
  static allocUnsafe(size: number): Buffer;
  /**
   * Allocates a new `Buffer` of `size` bytes. If `size` is larger than {@link constants.MAX_LENGTH} or smaller than 0, `ERR_INVALID_ARG_VALUE` is thrown. A zero-length `Buffer` is created
   * if `size` is 0.
   *
   * The underlying memory for `Buffer` instances created in this way is _not_
   * _initialized_. The contents of the newly created `Buffer` are unknown and_may contain sensitive data_. Use `buf.fill(0)` to initialize
   * such `Buffer` instances with zeroes.
   *
   * When using `Buffer.allocUnsafe()` to allocate new `Buffer` instances,
   * allocations under 4 KB are sliced from a single pre-allocated `Buffer`. This
   * allows applications to avoid the garbage collection overhead of creating many
   * individually allocated `Buffer` instances. This approach improves both
   * performance and memory usage by eliminating the need to track and clean up as
   * many individual `ArrayBuffer` objects.
   *
   * However, in the case where a developer may need to retain a small chunk of
   * memory from a pool for an indeterminate amount of time, it may be appropriate
   * to create an un-pooled `Buffer` instance using `Buffer.allocUnsafeSlow()` and
   * then copying out the relevant bits.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Need to keep around a few small chunks of memory.
   * const store = [];
   *
   * socket.on('readable', () => {
   *   let data;
   *   while (null !== (data = readable.read())) {
   *     // Allocate for retained data.
   *     const sb = Buffer.allocUnsafeSlow(10);
   *
   *     // Copy the data into the new allocation.
   *     data.copy(sb, 0, 0, 10);
   *
   *     store.push(sb);
   *   }
   * });
   * ```
   *
   * A `TypeError` will be thrown if `size` is not a number.
   * @since v5.12.0
   * @param size The desired length of the new `Buffer`.
   */
  static allocUnsafeSlow(size: number): Buffer;
  // /**
  //  * This is the size (in bytes) of pre-allocated internal `Buffer` instances used
  //  * for pooling. This value may be modified.
  //  * @since v0.11.3
  //  */
  // static poolSize: number;

  /**
   * Writes `string` to `buf` at `offset` according to the character encoding in`encoding`. The `length` parameter is the number of bytes to write. If `buf` did
   * not contain enough space to fit the entire string, only part of `string` will be
   * written. However, partially encoded characters will not be written.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.alloc(256);
   *
   * const len = buf.write('\u00bd + \u00bc = \u00be', 0);
   *
   * console.log(`${len} bytes: ${buf.toString('utf8', 0, len)}`);
   * // Prints: 12 bytes: ½ + ¼ = ¾
   *
   * const buffer = Buffer.alloc(10);
   *
   * const length = buffer.write('abcd', 8);
   *
   * console.log(`${length} bytes: ${buffer.toString('utf8', 8, 10)}`);
   * // Prints: 2 bytes : ab
   * ```
   * @since v0.1.90
   * @param string String to write to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write `string`.
   * @param [length=buf.length - offset] Maximum number of bytes to write (written bytes will not exceed `buf.length - offset`).
   * @param [encoding='utf8'] The character encoding of `string`.
   * @return Number of bytes written.
   */
  write(string: string, encoding?: Encoding): number;
  write(string: string, offset: number, encoding?: Encoding): number;
  write(
    string: string,
    offset: number,
    length: number,
    encoding?: Encoding,
  ): number;
  /**
   * Decodes `buf` to a string according to the specified character encoding in`encoding`. `start` and `end` may be passed to decode only a subset of `buf`.
   *
   * If `encoding` is `'utf8'` and a byte sequence in the input is not valid UTF-8,
   * then each invalid byte is replaced with the replacement character `U+FFFD`.
   *
   * The maximum length of a string instance (in UTF-16 code units) is available
   * as {@link constants.MAX_STRING_LENGTH}.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.allocUnsafe(26);
   *
   * for (let i = 0; i < 26; i++) {
   *   // 97 is the decimal ASCII value for 'a'.
   *   buf1[i] = i + 97;
   * }
   *
   * console.log(buf1.toString('utf8'));
   * // Prints: abcdefghijklmnopqrstuvwxyz
   * console.log(buf1.toString('utf8', 0, 5));
   * // Prints: abcde
   *
   * const buf2 = Buffer.from('tést');
   *
   * console.log(buf2.toString('hex'));
   * // Prints: 74c3a97374
   * console.log(buf2.toString('utf8', 0, 3));
   * // Prints: té
   * console.log(buf2.toString(undefined, 0, 3));
   * // Prints: té
   * ```
   * @since v0.1.90
   * @param [encoding='utf8'] The character encoding to use.
   * @param [start=0] The byte offset to start decoding at.
   * @param [end=buf.length] The byte offset to stop decoding at (not inclusive).
   */
  toString(encoding?: Encoding, start?: number, end?: number): string;
  /**
   * Returns a JSON representation of `buf`. [`JSON.stringify()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify) implicitly calls
   * this function when stringifying a `Buffer` instance.
   *
   * `Buffer.from()` accepts objects in the format returned from this method.
   * In particular, `Buffer.from(buf.toJSON())` works like `Buffer.from(buf)`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5]);
   * const json = JSON.stringify(buf);
   *
   * console.log(json);
   * // Prints: {"type":"Buffer","data":[1,2,3,4,5]}
   *
   * const copy = JSON.parse(json, (key, value) => {
   *   return value &#x26;&#x26; value.type === 'Buffer' ?
   *     Buffer.from(value) :
   *     value;
   * });
   *
   * console.log(copy);
   * // Prints: <Buffer 01 02 03 04 05>
   * ```
   * @since v0.9.2
   */
  toJSON(): {
    type: "Buffer";
    data: number[];
  };
  /**
   * Returns `true` if both `buf` and `otherBuffer` have exactly the same bytes,`false` otherwise. Equivalent to `buf.compare(otherBuffer) === 0`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from('ABC');
   * const buf2 = Buffer.from('414243', 'hex');
   * const buf3 = Buffer.from('ABCD');
   *
   * console.log(buf1.equals(buf2));
   * // Prints: true
   * console.log(buf1.equals(buf3));
   * // Prints: false
   * ```
   * @since v0.11.13
   * @param otherBuffer A `Buffer` or {@link Uint8Array} with which to compare `buf`.
   */
  equals(otherBuffer: Uint8Array): boolean;
  /**
   * Compares `buf` with `target` and returns a number indicating whether `buf`comes before, after, or is the same as `target` in sort order.
   * Comparison is based on the actual sequence of bytes in each `Buffer`.
   *
   * * `0` is returned if `target` is the same as `buf`
   * * `1` is returned if `target` should come _before_`buf` when sorted.
   * * `-1` is returned if `target` should come _after_`buf` when sorted.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from('ABC');
   * const buf2 = Buffer.from('BCD');
   * const buf3 = Buffer.from('ABCD');
   *
   * console.log(buf1.compare(buf1));
   * // Prints: 0
   * console.log(buf1.compare(buf2));
   * // Prints: -1
   * console.log(buf1.compare(buf3));
   * // Prints: -1
   * console.log(buf2.compare(buf1));
   * // Prints: 1
   * console.log(buf2.compare(buf3));
   * // Prints: 1
   * console.log([buf1, buf2, buf3].sort(Buffer.compare));
   * // Prints: [ <Buffer 41 42 43>, <Buffer 41 42 43 44>, <Buffer 42 43 44> ]
   * // (This result is equal to: [buf1, buf3, buf2].)
   * ```
   *
   * The optional `targetStart`, `targetEnd`, `sourceStart`, and `sourceEnd`arguments can be used to limit the comparison to specific ranges within `target`and `buf` respectively.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8, 9]);
   * const buf2 = Buffer.from([5, 6, 7, 8, 9, 1, 2, 3, 4]);
   *
   * console.log(buf1.compare(buf2, 5, 9, 0, 4));
   * // Prints: 0
   * console.log(buf1.compare(buf2, 0, 6, 4));
   * // Prints: -1
   * console.log(buf1.compare(buf2, 5, 6, 5));
   * // Prints: 1
   * ```
   *
   * `ERR_OUT_OF_RANGE` is thrown if `targetStart < 0`, `sourceStart < 0`,`targetEnd > target.byteLength`, or `sourceEnd > source.byteLength`.
   * @since v0.11.13
   * @param target A `Buffer` or {@link Uint8Array} with which to compare `buf`.
   * @param [targetStart=0] The offset within `target` at which to begin comparison.
   * @param [targetEnd=target.length] The offset within `target` at which to end comparison (not inclusive).
   * @param [sourceStart=0] The offset within `buf` at which to begin comparison.
   * @param [sourceEnd=buf.length] The offset within `buf` at which to end comparison (not inclusive).
   */
  compare(
    target: Uint8Array,
    targetStart?: number,
    targetEnd?: number,
    sourceStart?: number,
    sourceEnd?: number,
  ): number;
  /**
   * Copies data from a region of `buf` to a region in `target`, even if the `target`memory region overlaps with `buf`.
   *
   * [`TypedArray.prototype.set()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/set) performs the same operation, and is available
   * for all TypedArrays, including Node.js `Buffer`s, although it takes
   * different function arguments.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Create two `Buffer` instances.
   * const buf1 = Buffer.allocUnsafe(26);
   * const buf2 = Buffer.allocUnsafe(26).fill('!');
   *
   * for (let i = 0; i < 26; i++) {
   *   // 97 is the decimal ASCII value for 'a'.
   *   buf1[i] = i + 97;
   * }
   *
   * // Copy `buf1` bytes 16 through 19 into `buf2` starting at byte 8 of `buf2`.
   * buf1.copy(buf2, 8, 16, 20);
   * // This is equivalent to:
   * // buf2.set(buf1.subarray(16, 20), 8);
   *
   * console.log(buf2.toString('ascii', 0, 25));
   * // Prints: !!!!!!!!qrst!!!!!!!!!!!!!
   * ```
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Create a `Buffer` and copy data from one region to an overlapping region
   * // within the same `Buffer`.
   *
   * const buf = Buffer.allocUnsafe(26);
   *
   * for (let i = 0; i < 26; i++) {
   *   // 97 is the decimal ASCII value for 'a'.
   *   buf[i] = i + 97;
   * }
   *
   * buf.copy(buf, 0, 4, 10);
   *
   * console.log(buf.toString());
   * // Prints: efghijghijklmnopqrstuvwxyz
   * ```
   * @since v0.1.90
   * @param target A `Buffer` or {@link Uint8Array} to copy into.
   * @param [targetStart=0] The offset within `target` at which to begin writing.
   * @param [sourceStart=0] The offset within `buf` from which to begin copying.
   * @param [sourceEnd=buf.length] The offset within `buf` at which to stop copying (not inclusive).
   * @return The number of bytes copied.
   */
  copy(
    target: Uint8Array,
    targetStart?: number,
    sourceStart?: number,
    sourceEnd?: number,
  ): number;
  /**
   * Returns a new `Buffer` that references the same memory as the original, but
   * offset and cropped by the `start` and `end` indices.
   *
   * This is the same behavior as `buf.subarray()`.
   *
   * This method is not compatible with the `Uint8Array.prototype.slice()`,
   * which is a superclass of `Buffer`. To copy the slice, use`Uint8Array.prototype.slice()`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('buffer');
   *
   * const copiedBuf = Uint8Array.prototype.slice.call(buf);
   * copiedBuf[0]++;
   * console.log(copiedBuf.toString());
   * // Prints: cuffer
   *
   * console.log(buf.toString());
   * // Prints: buffer
   * ```
   * @since v0.3.0
   * @param [start=0] Where the new `Buffer` will start.
   * @param [end=buf.length] Where the new `Buffer` will end (not inclusive).
   */
  slice(start?: number, end?: number): Buffer;
  /**
   * Returns a new `Buffer` that references the same memory as the original, but
   * offset and cropped by the `start` and `end` indices.
   *
   * Specifying `end` greater than `buf.length` will return the same result as
   * that of `end` equal to `buf.length`.
   *
   * This method is inherited from [`TypedArray.prototype.subarray()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/subarray).
   *
   * Modifying the new `Buffer` slice will modify the memory in the original `Buffer`because the allocated memory of the two objects overlap.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Create a `Buffer` with the ASCII alphabet, take a slice, and modify one byte
   * // from the original `Buffer`.
   *
   * const buf1 = Buffer.allocUnsafe(26);
   *
   * for (let i = 0; i < 26; i++) {
   *   // 97 is the decimal ASCII value for 'a'.
   *   buf1[i] = i + 97;
   * }
   *
   * const buf2 = buf1.subarray(0, 3);
   *
   * console.log(buf2.toString('ascii', 0, buf2.length));
   * // Prints: abc
   *
   * buf1[0] = 33;
   *
   * console.log(buf2.toString('ascii', 0, buf2.length));
   * // Prints: !bc
   * ```
   *
   * Specifying negative indexes causes the slice to be generated relative to the
   * end of `buf` rather than the beginning.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('buffer');
   *
   * console.log(buf.subarray(-6, -1).toString());
   * // Prints: buffe
   * // (Equivalent to buf.subarray(0, 5).)
   *
   * console.log(buf.subarray(-6, -2).toString());
   * // Prints: buff
   * // (Equivalent to buf.subarray(0, 4).)
   *
   * console.log(buf.subarray(-5, -2).toString());
   * // Prints: uff
   * // (Equivalent to buf.subarray(1, 4).)
   * ```
   * @since v3.0.0
   * @param [start=0] Where the new `Buffer` will start.
   * @param [end=buf.length] Where the new `Buffer` will end (not inclusive).
   */
  subarray(start?: number, end?: number): Buffer;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian.
   *
   * `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeBigInt64BE(0x0102030405060708n, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 01 02 03 04 05 06 07 08>
   * ```
   * @since v12.0.0, v10.20.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeBigInt64BE(value: bigint, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian.
   *
   * `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeBigInt64LE(0x0102030405060708n, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 08 07 06 05 04 03 02 01>
   * ```
   * @since v12.0.0, v10.20.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeBigInt64LE(value: bigint, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian.
   *
   * This function is also available under the `writeBigUint64BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeBigUInt64BE(0xdecafafecacefaden, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer de ca fa fe ca ce fa de>
   * ```
   * @since v12.0.0, v10.20.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeBigUInt64BE(value: bigint, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeBigUInt64LE(0xdecafafecacefaden, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer de fa ce ca fe fa ca de>
   * ```
   *
   * This function is also available under the `writeBigUint64LE` alias.
   * @since v12.0.0, v10.20.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy: `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeBigUInt64LE(value: bigint, offset?: number): number;
  /**
   * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as little-endian. Supports up to 48 bits of accuracy. Behavior is undefined
   * when `value` is anything other than an unsigned integer.
   *
   * This function is also available under the `writeUintLE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(6);
   *
   * buf.writeUIntLE(0x1234567890ab, 0, 6);
   *
   * console.log(buf);
   * // Prints: <Buffer ab 90 78 56 34 12>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
   * @return `offset` plus the number of bytes written.
   */
  writeUIntLE(value: number, offset: number, byteLength: number): number;
  /**
   * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as big-endian. Supports up to 48 bits of accuracy. Behavior is undefined
   * when `value` is anything other than an unsigned integer.
   *
   * This function is also available under the `writeUintBE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(6);
   *
   * buf.writeUIntBE(0x1234567890ab, 0, 6);
   *
   * console.log(buf);
   * // Prints: <Buffer 12 34 56 78 90 ab>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
   * @return `offset` plus the number of bytes written.
   */
  writeUIntBE(value: number, offset: number, byteLength: number): number;
  /**
   * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as little-endian. Supports up to 48 bits of accuracy. Behavior is undefined
   * when `value` is anything other than a signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(6);
   *
   * buf.writeIntLE(0x1234567890ab, 0, 6);
   *
   * console.log(buf);
   * // Prints: <Buffer ab 90 78 56 34 12>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
   * @return `offset` plus the number of bytes written.
   */
  writeIntLE(value: number, offset: number, byteLength: number): number;
  /**
   * Writes `byteLength` bytes of `value` to `buf` at the specified `offset`as big-endian. Supports up to 48 bits of accuracy. Behavior is undefined when`value` is anything other than a
   * signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(6);
   *
   * buf.writeIntBE(0x1234567890ab, 0, 6);
   *
   * console.log(buf);
   * // Prints: <Buffer 12 34 56 78 90 ab>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param offset Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to write. Must satisfy `0 < byteLength <= 6`.
   * @return `offset` plus the number of bytes written.
   */
  writeIntBE(value: number, offset: number, byteLength: number): number;
  /**
   * Reads an unsigned, big-endian 64-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readBigUint64BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
   *
   * console.log(buf.readBigUInt64BE(0));
   * // Prints: 4294967295n
   * ```
   * @since v12.0.0, v10.20.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
   */
  readBigUInt64BE(offset?: number): bigint;
  /**
   * Reads an unsigned, little-endian 64-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readBigUint64LE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff]);
   *
   * console.log(buf.readBigUInt64LE(0));
   * // Prints: 18446744069414584320n
   * ```
   * @since v12.0.0, v10.20.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
   */
  readBigUInt64LE(offset?: number): bigint;
  /**
   * Reads a signed, big-endian 64-bit integer from `buf` at the specified `offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed
   * values.
   * @since v12.0.0, v10.20.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
   */
  readBigInt64BE(offset?: number): bigint;
  /**
   * Reads a signed, little-endian 64-bit integer from `buf` at the specified`offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed
   * values.
   * @since v12.0.0, v10.20.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy: `0 <= offset <= buf.length - 8`.
   */
  readBigInt64LE(offset?: number): bigint;
  /**
   * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as an unsigned, little-endian integer supporting
   * up to 48 bits of accuracy.
   *
   * This function is also available under the `readUintLE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
   *
   * console.log(buf.readUIntLE(0, 6).toString(16));
   * // Prints: ab9078563412
   * ```
   * @since v0.11.15
   * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
   */
  readUIntLE(offset: number, byteLength: number): number;
  /**
   * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as an unsigned big-endian integer supporting
   * up to 48 bits of accuracy.
   *
   * This function is also available under the `readUintBE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
   *
   * console.log(buf.readUIntBE(0, 6).toString(16));
   * // Prints: 1234567890ab
   * console.log(buf.readUIntBE(1, 6).toString(16));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.11.15
   * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
   */
  readUIntBE(offset: number, byteLength: number): number;
  /**
   * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as a little-endian, two's complement signed value
   * supporting up to 48 bits of accuracy.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
   *
   * console.log(buf.readIntLE(0, 6).toString(16));
   * // Prints: -546f87a9cbee
   * ```
   * @since v0.11.15
   * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
   */
  readIntLE(offset: number, byteLength: number): number;
  /**
   * Reads `byteLength` number of bytes from `buf` at the specified `offset`and interprets the result as a big-endian, two's complement signed value
   * supporting up to 48 bits of accuracy.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);
   *
   * console.log(buf.readIntBE(0, 6).toString(16));
   * // Prints: 1234567890ab
   * console.log(buf.readIntBE(1, 6).toString(16));
   * // Throws ERR_OUT_OF_RANGE.
   * console.log(buf.readIntBE(1, 0).toString(16));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.11.15
   * @param offset Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - byteLength`.
   * @param byteLength Number of bytes to read. Must satisfy `0 < byteLength <= 6`.
   */
  readIntBE(offset: number, byteLength: number): number;
  /**
   * Reads an unsigned 8-bit integer from `buf` at the specified `offset`.
   *
   * This function is also available under the `readUint8` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([1, -2]);
   *
   * console.log(buf.readUInt8(0));
   * // Prints: 1
   * console.log(buf.readUInt8(1));
   * // Prints: 254
   * console.log(buf.readUInt8(2));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 1`.
   */
  readUInt8(offset?: number): number;
  /**
   * Reads an unsigned, little-endian 16-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readUint16LE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56]);
   *
   * console.log(buf.readUInt16LE(0).toString(16));
   * // Prints: 3412
   * console.log(buf.readUInt16LE(1).toString(16));
   * // Prints: 5634
   * console.log(buf.readUInt16LE(2).toString(16));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
   */
  readUInt16LE(offset?: number): number;
  /**
   * Reads an unsigned, big-endian 16-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readUint16BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56]);
   *
   * console.log(buf.readUInt16BE(0).toString(16));
   * // Prints: 1234
   * console.log(buf.readUInt16BE(1).toString(16));
   * // Prints: 3456
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
   */
  readUInt16BE(offset?: number): number;
  /**
   * Reads an unsigned, little-endian 32-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readUint32LE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78]);
   *
   * console.log(buf.readUInt32LE(0).toString(16));
   * // Prints: 78563412
   * console.log(buf.readUInt32LE(1).toString(16));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readUInt32LE(offset?: number): number;
  /**
   * Reads an unsigned, big-endian 32-bit integer from `buf` at the specified`offset`.
   *
   * This function is also available under the `readUint32BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0x12, 0x34, 0x56, 0x78]);
   *
   * console.log(buf.readUInt32BE(0).toString(16));
   * // Prints: 12345678
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readUInt32BE(offset?: number): number;
  /**
   * Reads a signed 8-bit integer from `buf` at the specified `offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed values.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([-1, 5]);
   *
   * console.log(buf.readInt8(0));
   * // Prints: -1
   * console.log(buf.readInt8(1));
   * // Prints: 5
   * console.log(buf.readInt8(2));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.0
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 1`.
   */
  readInt8(offset?: number): number;
  /**
   * Reads a signed, little-endian 16-bit integer from `buf` at the specified`offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed values.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0, 5]);
   *
   * console.log(buf.readInt16LE(0));
   * // Prints: 1280
   * console.log(buf.readInt16LE(1));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
   */
  readInt16LE(offset?: number): number;
  /**
   * Reads a signed, big-endian 16-bit integer from `buf` at the specified `offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed values.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0, 5]);
   *
   * console.log(buf.readInt16BE(0));
   * // Prints: 5
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 2`.
   */
  readInt16BE(offset?: number): number;
  /**
   * Reads a signed, little-endian 32-bit integer from `buf` at the specified`offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed values.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0, 0, 0, 5]);
   *
   * console.log(buf.readInt32LE(0));
   * // Prints: 83886080
   * console.log(buf.readInt32LE(1));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readInt32LE(offset?: number): number;
  /**
   * Reads a signed, big-endian 32-bit integer from `buf` at the specified `offset`.
   *
   * Integers read from a `Buffer` are interpreted as two's complement signed values.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([0, 0, 0, 5]);
   *
   * console.log(buf.readInt32BE(0));
   * // Prints: 5
   * ```
   * @since v0.5.5
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readInt32BE(offset?: number): number;
  /**
   * Reads a 32-bit, little-endian float from `buf` at the specified `offset`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([1, 2, 3, 4]);
   *
   * console.log(buf.readFloatLE(0));
   * // Prints: 1.539989614439558e-36
   * console.log(buf.readFloatLE(1));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.11.15
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readFloatLE(offset?: number): number;
  /**
   * Reads a 32-bit, big-endian float from `buf` at the specified `offset`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([1, 2, 3, 4]);
   *
   * console.log(buf.readFloatBE(0));
   * // Prints: 2.387939260590663e-38
   * ```
   * @since v0.11.15
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 4`.
   */
  readFloatBE(offset?: number): number;
  /**
   * Reads a 64-bit, little-endian double from `buf` at the specified `offset`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
   *
   * console.log(buf.readDoubleLE(0));
   * // Prints: 5.447603722011605e-270
   * console.log(buf.readDoubleLE(1));
   * // Throws ERR_OUT_OF_RANGE.
   * ```
   * @since v0.11.15
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 8`.
   */
  readDoubleLE(offset?: number): number;
  /**
   * Reads a 64-bit, big-endian double from `buf` at the specified `offset`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from([1, 2, 3, 4, 5, 6, 7, 8]);
   *
   * console.log(buf.readDoubleBE(0));
   * // Prints: 8.20788039913184e-304
   * ```
   * @since v0.11.15
   * @param [offset=0] Number of bytes to skip before starting to read. Must satisfy `0 <= offset <= buf.length - 8`.
   */
  readDoubleBE(offset?: number): number;
  reverse(): this;
  /**
   * Interprets `buf` as an array of unsigned 16-bit integers and swaps the
   * byte order _in-place_. Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 2.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
   *
   * console.log(buf1);
   * // Prints: <Buffer 01 02 03 04 05 06 07 08>
   *
   * buf1.swap16();
   *
   * console.log(buf1);
   * // Prints: <Buffer 02 01 04 03 06 05 08 07>
   *
   * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
   *
   * buf2.swap16();
   * // Throws ERR_INVALID_BUFFER_SIZE.
   * ```
   *
   * One convenient use of `buf.swap16()` is to perform a fast in-place conversion
   * between UTF-16 little-endian and UTF-16 big-endian:
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('This is little-endian UTF-16', 'utf16le');
   * buf.swap16(); // Convert to big-endian UTF-16 text.
   * ```
   * @since v5.10.0
   * @return A reference to `buf`.
   */
  swap16(): Buffer;
  /**
   * Interprets `buf` as an array of unsigned 32-bit integers and swaps the
   * byte order _in-place_. Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 4.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
   *
   * console.log(buf1);
   * // Prints: <Buffer 01 02 03 04 05 06 07 08>
   *
   * buf1.swap32();
   *
   * console.log(buf1);
   * // Prints: <Buffer 04 03 02 01 08 07 06 05>
   *
   * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
   *
   * buf2.swap32();
   * // Throws ERR_INVALID_BUFFER_SIZE.
   * ```
   * @since v5.10.0
   * @return A reference to `buf`.
   */
  swap32(): Buffer;
  /**
   * Interprets `buf` as an array of 64-bit numbers and swaps byte order _in-place_.
   * Throws `ERR_INVALID_BUFFER_SIZE` if `buf.length` is not a multiple of 8.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf1 = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8]);
   *
   * console.log(buf1);
   * // Prints: <Buffer 01 02 03 04 05 06 07 08>
   *
   * buf1.swap64();
   *
   * console.log(buf1);
   * // Prints: <Buffer 08 07 06 05 04 03 02 01>
   *
   * const buf2 = Buffer.from([0x1, 0x2, 0x3]);
   *
   * buf2.swap64();
   * // Throws ERR_INVALID_BUFFER_SIZE.
   * ```
   * @since v6.3.0
   * @return A reference to `buf`.
   */
  swap64(): Buffer;
  /**
   * Writes `value` to `buf` at the specified `offset`. `value` must be a
   * valid unsigned 8-bit integer. Behavior is undefined when `value` is anything
   * other than an unsigned 8-bit integer.
   *
   * This function is also available under the `writeUint8` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeUInt8(0x3, 0);
   * buf.writeUInt8(0x4, 1);
   * buf.writeUInt8(0x23, 2);
   * buf.writeUInt8(0x42, 3);
   *
   * console.log(buf);
   * // Prints: <Buffer 03 04 23 42>
   * ```
   * @since v0.5.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 1`.
   * @return `offset` plus the number of bytes written.
   */
  writeUInt8(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid unsigned 16-bit integer. Behavior is undefined when `value` is
   * anything other than an unsigned 16-bit integer.
   *
   * This function is also available under the `writeUint16LE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeUInt16LE(0xdead, 0);
   * buf.writeUInt16LE(0xbeef, 2);
   *
   * console.log(buf);
   * // Prints: <Buffer ad de ef be>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
   * @return `offset` plus the number of bytes written.
   */
  writeUInt16LE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid unsigned 16-bit integer. Behavior is undefined when `value`is anything other than an
   * unsigned 16-bit integer.
   *
   * This function is also available under the `writeUint16BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeUInt16BE(0xdead, 0);
   * buf.writeUInt16BE(0xbeef, 2);
   *
   * console.log(buf);
   * // Prints: <Buffer de ad be ef>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
   * @return `offset` plus the number of bytes written.
   */
  writeUInt16BE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid unsigned 32-bit integer. Behavior is undefined when `value` is
   * anything other than an unsigned 32-bit integer.
   *
   * This function is also available under the `writeUint32LE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeUInt32LE(0xfeedface, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer ce fa ed fe>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeUInt32LE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid unsigned 32-bit integer. Behavior is undefined when `value`is anything other than an
   * unsigned 32-bit integer.
   *
   * This function is also available under the `writeUint32BE` alias.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeUInt32BE(0xfeedface, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer fe ed fa ce>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeUInt32BE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset`. `value` must be a valid
   * signed 8-bit integer. Behavior is undefined when `value` is anything other than
   * a signed 8-bit integer.
   *
   * `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(2);
   *
   * buf.writeInt8(2, 0);
   * buf.writeInt8(-2, 1);
   *
   * console.log(buf);
   * // Prints: <Buffer 02 fe>
   * ```
   * @since v0.5.0
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 1`.
   * @return `offset` plus the number of bytes written.
   */
  writeInt8(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian.  The `value`must be a valid signed 16-bit integer. Behavior is undefined when `value` is
   * anything other than a signed 16-bit integer.
   *
   * The `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(2);
   *
   * buf.writeInt16LE(0x0304, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 04 03>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
   * @return `offset` plus the number of bytes written.
   */
  writeInt16LE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian.  The `value`must be a valid signed 16-bit integer. Behavior is undefined when `value` is
   * anything other than a signed 16-bit integer.
   *
   * The `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(2);
   *
   * buf.writeInt16BE(0x0102, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 01 02>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 2`.
   * @return `offset` plus the number of bytes written.
   */
  writeInt16BE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a valid signed 32-bit integer. Behavior is undefined when `value` is
   * anything other than a signed 32-bit integer.
   *
   * The `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeInt32LE(0x05060708, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 08 07 06 05>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeInt32LE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a valid signed 32-bit integer. Behavior is undefined when `value` is
   * anything other than a signed 32-bit integer.
   *
   * The `value` is interpreted and written as a two's complement signed integer.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeInt32BE(0x01020304, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 01 02 03 04>
   * ```
   * @since v0.5.5
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeInt32BE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian. Behavior is
   * undefined when `value` is anything other than a JavaScript number.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeFloatLE(0xcafebabe, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer bb fe 4a 4f>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeFloatLE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian. Behavior is
   * undefined when `value` is anything other than a JavaScript number.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(4);
   *
   * buf.writeFloatBE(0xcafebabe, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 4f 4a fe bb>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 4`.
   * @return `offset` plus the number of bytes written.
   */
  writeFloatBE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as little-endian. The `value`must be a JavaScript number. Behavior is undefined when `value` is anything
   * other than a JavaScript number.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeDoubleLE(123.456, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 77 be 9f 1a 2f dd 5e 40>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeDoubleLE(value: number, offset?: number): number;
  /**
   * Writes `value` to `buf` at the specified `offset` as big-endian. The `value`must be a JavaScript number. Behavior is undefined when `value` is anything
   * other than a JavaScript number.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(8);
   *
   * buf.writeDoubleBE(123.456, 0);
   *
   * console.log(buf);
   * // Prints: <Buffer 40 5e dd 2f 1a 9f be 77>
   * ```
   * @since v0.11.15
   * @param value Number to be written to `buf`.
   * @param [offset=0] Number of bytes to skip before starting to write. Must satisfy `0 <= offset <= buf.length - 8`.
   * @return `offset` plus the number of bytes written.
   */
  writeDoubleBE(value: number, offset?: number): number;
  /**
   * Fills `buf` with the specified `value`. If the `offset` and `end` are not given,
   * the entire `buf` will be filled:
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Fill a `Buffer` with the ASCII character 'h'.
   *
   * const b = Buffer.allocUnsafe(50).fill('h');
   *
   * console.log(b.toString());
   * // Prints: hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
   * ```
   *
   * `value` is coerced to a `uint32` value if it is not a string, `Buffer`, or
   * integer. If the resulting integer is greater than `255` (decimal), `buf` will be
   * filled with `value &#x26; 255`.
   *
   * If the final write of a `fill()` operation falls on a multi-byte character,
   * then only the bytes of that character that fit into `buf` are written:
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Fill a `Buffer` with character that takes up two bytes in UTF-8.
   *
   * console.log(Buffer.allocUnsafe(5).fill('\u0222'));
   * // Prints: <Buffer c8 a2 c8 a2 c8>
   * ```
   *
   * If `value` contains invalid characters, it is truncated; if no valid
   * fill data remains, an exception is thrown:
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.allocUnsafe(5);
   *
   * console.log(buf.fill('a'));
   * // Prints: <Buffer 61 61 61 61 61>
   * console.log(buf.fill('aazz', 'hex'));
   * // Prints: <Buffer aa aa aa aa aa>
   * console.log(buf.fill('zz', 'hex'));
   * // Throws an exception.
   * ```
   * @since v0.5.0
   * @param value The value with which to fill `buf`.
   * @param [offset=0] Number of bytes to skip before starting to fill `buf`.
   * @param [end=buf.length] Where to stop filling `buf` (not inclusive).
   * @param [encoding='utf8'] The encoding for `value` if `value` is a string.
   * @return A reference to `buf`.
   */
  fill(
    value: string | Uint8Array | number,
    offset?: number,
    end?: number,
    encoding?: Encoding,
  ): this;
  /**
   * If `value` is:
   *
   * * a string, `value` is interpreted according to the character encoding in`encoding`.
   * * a `Buffer` or [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array), `value` will be used in its entirety.
   * To compare a partial `Buffer`, use `buf.slice()`.
   * * a number, `value` will be interpreted as an unsigned 8-bit integer
   * value between `0` and `255`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('this is a buffer');
   *
   * console.log(buf.indexOf('this'));
   * // Prints: 0
   * console.log(buf.indexOf('is'));
   * // Prints: 2
   * console.log(buf.indexOf(Buffer.from('a buffer')));
   * // Prints: 8
   * console.log(buf.indexOf(97));
   * // Prints: 8 (97 is the decimal ASCII value for 'a')
   * console.log(buf.indexOf(Buffer.from('a buffer example')));
   * // Prints: -1
   * console.log(buf.indexOf(Buffer.from('a buffer example').slice(0, 8)));
   * // Prints: 8
   *
   * const utf16Buffer = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'utf16le');
   *
   * console.log(utf16Buffer.indexOf('\u03a3', 0, 'utf16le'));
   * // Prints: 4
   * console.log(utf16Buffer.indexOf('\u03a3', -4, 'utf16le'));
   * // Prints: 6
   * ```
   *
   * If `value` is not a string, number, or `Buffer`, this method will throw a`TypeError`. If `value` is a number, it will be coerced to a valid byte value,
   * an integer between 0 and 255.
   *
   * If `byteOffset` is not a number, it will be coerced to a number. If the result
   * of coercion is `NaN` or `0`, then the entire buffer will be searched. This
   * behavior matches [`String.prototype.indexOf()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf).
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const b = Buffer.from('abcdef');
   *
   * // Passing a value that's a number, but not a valid byte.
   * // Prints: 2, equivalent to searching for 99 or 'c'.
   * console.log(b.indexOf(99.9));
   * console.log(b.indexOf(256 + 99));
   *
   * // Passing a byteOffset that coerces to NaN or 0.
   * // Prints: 1, searching the whole buffer.
   * console.log(b.indexOf('b', undefined));
   * console.log(b.indexOf('b', {}));
   * console.log(b.indexOf('b', null));
   * console.log(b.indexOf('b', []));
   * ```
   *
   * If `value` is an empty string or empty `Buffer` and `byteOffset` is less
   * than `buf.length`, `byteOffset` will be returned. If `value` is empty and`byteOffset` is at least `buf.length`, `buf.length` will be returned.
   * @since v1.5.0
   * @param value What to search for.
   * @param [byteOffset=0] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
   * @param [encoding='utf8'] If `value` is a string, this is the encoding used to determine the binary representation of the string that will be searched for in `buf`.
   * @return The index of the first occurrence of `value` in `buf`, or `-1` if `buf` does not contain `value`.
   */
  indexOf(
    value: string | number | Uint8Array,
    byteOffset?: number,
    encoding?: Encoding,
  ): number;
  /**
   * Identical to `buf.indexOf()`, except the last occurrence of `value` is found
   * rather than the first occurrence.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('this buffer is a buffer');
   *
   * console.log(buf.lastIndexOf('this'));
   * // Prints: 0
   * console.log(buf.lastIndexOf('buffer'));
   * // Prints: 17
   * console.log(buf.lastIndexOf(Buffer.from('buffer')));
   * // Prints: 17
   * console.log(buf.lastIndexOf(97));
   * // Prints: 15 (97 is the decimal ASCII value for 'a')
   * console.log(buf.lastIndexOf(Buffer.from('yolo')));
   * // Prints: -1
   * console.log(buf.lastIndexOf('buffer', 5));
   * // Prints: 5
   * console.log(buf.lastIndexOf('buffer', 4));
   * // Prints: -1
   *
   * const utf16Buffer = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'utf16le');
   *
   * console.log(utf16Buffer.lastIndexOf('\u03a3', undefined, 'utf16le'));
   * // Prints: 6
   * console.log(utf16Buffer.lastIndexOf('\u03a3', -5, 'utf16le'));
   * // Prints: 4
   * ```
   *
   * If `value` is not a string, number, or `Buffer`, this method will throw a`TypeError`. If `value` is a number, it will be coerced to a valid byte value,
   * an integer between 0 and 255.
   *
   * If `byteOffset` is not a number, it will be coerced to a number. Any arguments
   * that coerce to `NaN`, like `{}` or `undefined`, will search the whole buffer.
   * This behavior matches [`String.prototype.lastIndexOf()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/lastIndexOf).
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const b = Buffer.from('abcdef');
   *
   * // Passing a value that's a number, but not a valid byte.
   * // Prints: 2, equivalent to searching for 99 or 'c'.
   * console.log(b.lastIndexOf(99.9));
   * console.log(b.lastIndexOf(256 + 99));
   *
   * // Passing a byteOffset that coerces to NaN.
   * // Prints: 1, searching the whole buffer.
   * console.log(b.lastIndexOf('b', undefined));
   * console.log(b.lastIndexOf('b', {}));
   *
   * // Passing a byteOffset that coerces to 0.
   * // Prints: -1, equivalent to passing 0.
   * console.log(b.lastIndexOf('b', null));
   * console.log(b.lastIndexOf('b', []));
   * ```
   *
   * If `value` is an empty string or empty `Buffer`, `byteOffset` will be returned.
   * @since v6.0.0
   * @param value What to search for.
   * @param [byteOffset=buf.length - 1] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
   * @param [encoding='utf8'] If `value` is a string, this is the encoding used to determine the binary representation of the string that will be searched for in `buf`.
   * @return The index of the last occurrence of `value` in `buf`, or `-1` if `buf` does not contain `value`.
   */
  lastIndexOf(
    value: string | number | Uint8Array,
    byteOffset?: number,
    encoding?: Encoding,
  ): number;
  /**
   * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) of `[index, byte]` pairs from the contents
   * of `buf`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * // Log the entire contents of a `Buffer`.
   *
   * const buf = Buffer.from('buffer');
   *
   * for (const pair of buf.entries()) {
   *   console.log(pair);
   * }
   * // Prints:
   * //   [0, 98]
   * //   [1, 117]
   * //   [2, 102]
   * //   [3, 102]
   * //   [4, 101]
   * //   [5, 114]
   * ```
   * @since v1.1.0
   */
  entries(): IterableIterator<[number, number]>;
  /**
   * Equivalent to `buf.indexOf() !== -1`.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('this is a buffer');
   *
   * console.log(buf.includes('this'));
   * // Prints: true
   * console.log(buf.includes('is'));
   * // Prints: true
   * console.log(buf.includes(Buffer.from('a buffer')));
   * // Prints: true
   * console.log(buf.includes(97));
   * // Prints: true (97 is the decimal ASCII value for 'a')
   * console.log(buf.includes(Buffer.from('a buffer example')));
   * // Prints: false
   * console.log(buf.includes(Buffer.from('a buffer example').slice(0, 8)));
   * // Prints: true
   * console.log(buf.includes('this', 4));
   * // Prints: false
   * ```
   * @since v5.3.0
   * @param value What to search for.
   * @param [byteOffset=0] Where to begin searching in `buf`. If negative, then offset is calculated from the end of `buf`.
   * @param [encoding='utf8'] If `value` is a string, this is its encoding.
   * @return `true` if `value` was found in `buf`, `false` otherwise.
   */
  includes(
    value: string | number | Buffer,
    byteOffset?: number,
    encoding?: Encoding,
  ): boolean;
  /**
   * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) of `buf` keys (indices).
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('buffer');
   *
   * for (const key of buf.keys()) {
   *   console.log(key);
   * }
   * // Prints:
   * //   0
   * //   1
   * //   2
   * //   3
   * //   4
   * //   5
   * ```
   * @since v1.1.0
   */
  keys(): IterableIterator<number>;
  /**
   * Creates and returns an [iterator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols) for `buf` values (bytes). This function is
   * called automatically when a `Buffer` is used in a `for..of` statement.
   *
   * ```js
   * import { Buffer } from 'buffer';
   *
   * const buf = Buffer.from('buffer');
   *
   * for (const value of buf.values()) {
   *   console.log(value);
   * }
   * // Prints:
   * //   98
   * //   117
   * //   102
   * //   102
   * //   101
   * //   114
   *
   * for (const value of buf) {
   *   console.log(value);
   * }
   * // Prints:
   * //   98
   * //   117
   * //   102
   * //   102
   * //   101
   * //   114
   * ```
   * @since v1.1.0
   */
  values(): IterableIterator<number>;
}

export const SlowBuffer: {
  /** @deprecated since v6.0.0, use `Buffer.allocUnsafeSlow()` */
  new (size: number): Buffer;
  prototype: Buffer;
};

export const atob: typeof globalThis.atob;
export const Blob: Blob;
export const btoa: typeof globalThis.btoa;
export const constants: {
  MAX_LENGTH: number;
  MAX_STRING_LENGTH: number;
};
export const kMaxLength: number;
export const kStringMaxLength: number;

declare const exports: {
  atob: typeof atob;
  Blob: Blob;
  btoa: typeof btoa;
  Buffer: Buffer;
  constants: typeof constants;
  kMaxLength: typeof kMaxLength;
  kStringMaxLength: typeof kStringMaxLength;
  SlowBuffer: typeof SlowBuffer;
};

export default exports;