Current File : //usr/share/nodejs/@types/node/buffer.d.ts
/**
* `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 & 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/v18.0.0/lib/buffer.js)
*/
declare module "buffer" {
import { BinaryLike } from "node:crypto";
import { ReadableStream as WebReadableStream } from "node:stream/web";
export function isUtf8(input: Buffer | ArrayBuffer | NodeJS.TypedArray): boolean;
export function isAscii(input: Buffer | ArrayBuffer | NodeJS.TypedArray): boolean;
export const INSPECT_MAX_BYTES: number;
export const kMaxLength: number;
export const kStringMaxLength: number;
export const constants: {
MAX_LENGTH: number;
MAX_STRING_LENGTH: number;
};
export type TranscodeEncoding = "ascii" | "utf8" | "utf16le" | "ucs2" | "latin1" | "binary";
/**
* Re-encodes the given `Buffer` or `Uint8Array` instance from one character
* encoding to another. Returns a new `Buffer` instance.
*
* Throws if the `fromEnc` or `toEnc` specify invalid character encodings or if
* conversion from `fromEnc` to `toEnc` is not permitted.
*
* Encodings supported by `buffer.transcode()` are: `'ascii'`, `'utf8'`,`'utf16le'`, `'ucs2'`, `'latin1'`, and `'binary'`.
*
* The transcoding process will use substitution characters if a given byte
* sequence cannot be adequately represented in the target encoding. For instance:
*
* ```js
* import { Buffer, transcode } from 'buffer';
*
* const newBuf = transcode(Buffer.from('€'), 'utf8', 'ascii');
* console.log(newBuf.toString('ascii'));
* // Prints: '?'
* ```
*
* Because the Euro (`€`) sign is not representable in US-ASCII, it is replaced
* with `?` in the transcoded `Buffer`.
* @since v7.1.0
* @param source A `Buffer` or `Uint8Array` instance.
* @param fromEnc The current encoding.
* @param toEnc To target encoding.
*/
export function transcode(source: Uint8Array, fromEnc: TranscodeEncoding, toEnc: TranscodeEncoding): Buffer;
export const SlowBuffer: {
/** @deprecated since v6.0.0, use `Buffer.allocUnsafeSlow()` */
new(size: number): Buffer;
prototype: Buffer;
};
/**
* Resolves a `'blob:nodedata:...'` an associated `Blob` object registered using
* a prior call to `URL.createObjectURL()`.
* @since v16.7.0
* @experimental
* @param id A `'blob:nodedata:...` URL string returned by a prior call to `URL.createObjectURL()`.
*/
export function resolveObjectURL(id: string): Blob | undefined;
export { Buffer };
/**
* @experimental
*/
export interface BlobOptions {
/**
* @default 'utf8'
*/
encoding?: BufferEncoding | undefined;
/**
* The Blob content-type. The intent is for `type` to convey
* the MIME media type of the data, however no validation of the type format
* is performed.
*/
type?: string | undefined;
}
/**
* A [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) encapsulates immutable, raw data that can be safely shared across
* multiple worker threads.
* @since v15.7.0, v14.18.0
*/
export class Blob {
/**
* The total size of the `Blob` in bytes.
* @since v15.7.0, v14.18.0
*/
readonly size: number;
/**
* The content-type of the `Blob`.
* @since v15.7.0, v14.18.0
*/
readonly type: string;
/**
* Creates a new `Blob` object containing a concatenation of the given sources.
*
* {ArrayBuffer}, {TypedArray}, {DataView}, and {Buffer} sources are copied into
* the 'Blob' and can therefore be safely modified after the 'Blob' is created.
*
* String sources are also copied into the `Blob`.
*/
constructor(sources: Array<BinaryLike | Blob>, options?: BlobOptions);
/**
* Returns a promise that fulfills with an [ArrayBuffer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) containing a copy of
* the `Blob` data.
* @since v15.7.0, v14.18.0
*/
arrayBuffer(): Promise<ArrayBuffer>;
/**
* Creates and returns a new `Blob` containing a subset of this `Blob` objects
* data. The original `Blob` is not altered.
* @since v15.7.0, v14.18.0
* @param start The starting index.
* @param end The ending index.
* @param type The content-type for the new `Blob`
*/
slice(start?: number, end?: number, type?: string): Blob;
/**
* Returns a promise that fulfills with the contents of the `Blob` decoded as a
* UTF-8 string.
* @since v15.7.0, v14.18.0
*/
text(): Promise<string>;
/**
* Returns a new (WHATWG) `ReadableStream` that allows the content of the `Blob` to be read.
* @since v16.7.0
*/
stream(): WebReadableStream;
}
export interface FileOptions {
/**
* One of either `'transparent'` or `'native'`. When set to `'native'`, line endings in string source parts will be
* converted to the platform native line-ending as specified by `require('node:os').EOL`.
*/
endings?: "native" | "transparent";
/** The File content-type. */
type?: string;
/** The last modified date of the file. `Default`: Date.now(). */
lastModified?: number;
}
/**
* A [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File) provides information about files.
* @experimental
* @since v18.13.0
*/
export class File extends Blob {
constructor(sources: Array<BinaryLike | Blob>, fileName: string, options?: FileOptions);
/**
* The name of the `File`.
* @since v18.13.0
*/
readonly name: string;
/**
* The last modified date of the `File`.
* @since v18.13.0
*/
readonly lastModified: number;
}
export import atob = globalThis.atob;
export import btoa = globalThis.btoa;
import { Blob as NodeBlob } from "buffer";
// This conditional type will be the existing global Blob in a browser, or
// the copy below in a Node environment.
type __Blob = typeof globalThis extends { onmessage: any; Blob: any } ? {} : NodeBlob;
global {
namespace NodeJS {
export { BufferEncoding };
}
// Buffer class
type BufferEncoding =
| "ascii"
| "utf8"
| "utf-8"
| "utf16le"
| "ucs2"
| "ucs-2"
| "base64"
| "base64url"
| "latin1"
| "binary"
| "hex";
type WithImplicitCoercion<T> =
| T
| {
valueOf(): T;
};
/**
* Raw data is stored in instances of the Buffer class.
* A Buffer is similar to an array of integers but corresponds to a raw memory allocation outside the V8 heap. A Buffer cannot be resized.
* Valid string encodings: 'ascii'|'utf8'|'utf16le'|'ucs2'(alias of 'utf16le')|'base64'|'base64url'|'binary'(deprecated)|'hex'
*/
interface BufferConstructor {
/**
* 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.
*/
new(str: string, encoding?: BufferEncoding): Buffer;
/**
* 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()`).
*/
new(size: number): Buffer;
/**
* 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.
*/
new(array: Uint8Array): Buffer;
/**
* 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.
*/
new(arrayBuffer: ArrayBuffer | SharedArrayBuffer): Buffer;
/**
* 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.
*/
new(array: readonly any[]): Buffer;
/**
* 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.
*/
new(buffer: 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
*/
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
*/
from(data: Uint8Array | readonly number[]): Buffer;
from(data: WithImplicitCoercion<Uint8Array | readonly 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'.
*/
from(
str:
| WithImplicitCoercion<string>
| {
[Symbol.toPrimitive](hint: "string"): string;
},
encoding?: BufferEncoding,
): Buffer;
/**
* Creates a new Buffer using the passed {data}
* @param values to create a new Buffer
*/
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
*/
isBuffer(obj: any): 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.
*/
isEncoding(encoding: string): encoding is BufferEncoding;
/**
* 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`.
*/
byteLength(
string: string | NodeJS.ArrayBufferView | ArrayBuffer | SharedArrayBuffer,
encoding?: BufferEncoding,
): 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.
*/
concat(list: readonly Uint8Array[], totalLength?: number): Buffer;
/**
* Copies the underlying memory of `view` into a new `Buffer`.
* @since v18.16.0
* @param view The `TypedArray` to copy.
* @param offset The starting offset within `view`.
* @param length The number of elements from `view` to copy.
*/
copyBytesFrom(view: NodeJS.TypedArray, offset?: number, length?: 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.
*/
compare(buf1: Uint8Array, buf2: Uint8Array): -1 | 0 | 1;
/**
* 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.
*/
alloc(size: number, fill?: string | Uint8Array | number, encoding?: BufferEncoding): 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`.
*/
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`.
*/
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
*/
poolSize: number;
}
interface Buffer extends Uint8Array {
/**
* 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?: BufferEncoding): number;
write(string: string, offset: number, encoding?: BufferEncoding): number;
write(string: string, offset: number, length: number, encoding?: BufferEncoding): 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?: BufferEncoding, 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 && 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,
): -1 | 0 | 1;
/**
* 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 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
*
* // With buf.slice(), the original buffer is modified.
* const notReallyCopiedBuf = buf.slice();
* notReallyCopiedBuf[0]++;
* console.log(notReallyCopiedBuf.toString());
* // Prints: cuffer
* console.log(buf.toString());
* // Also prints: cuffer (!)
* ```
* @since v0.3.0
* @deprecated Use `subarray` instead.
* @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;
/**
* @alias Buffer.writeBigUInt64BE
* @since v14.10.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeBigUInt64LE
* @since v14.10.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUIntLE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUIntBE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readBigUInt64BE
* @since v14.10.0, v12.19.0
*/
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;
/**
* @alias Buffer.readBigUInt64LE
* @since v14.10.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUIntLE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUIntBE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUInt8
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUInt16LE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUInt16BE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUInt32LE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.readUInt32BE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUInt8
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUInt16LE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUInt16BE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUInt32LE
* @since v14.9.0, v12.19.0
*/
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;
/**
* @alias Buffer.writeUInt32BE
* @since v14.9.0, v12.19.0
*/
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 & 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?: BufferEncoding): 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.subarray`.
* * 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?: BufferEncoding): 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?: BufferEncoding): 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?: BufferEncoding): 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>;
}
var Buffer: BufferConstructor;
/**
* Decodes a string of Base64-encoded data into bytes, and encodes those bytes
* into a string using Latin-1 (ISO-8859-1).
*
* The `data` may be any JavaScript-value that can be coerced into a string.
*
* **This function is only provided for compatibility with legacy web platform APIs**
* **and should never be used in new code, because they use strings to represent**
* **binary data and predate the introduction of typed arrays in JavaScript.**
* **For code running using Node.js APIs, converting between base64-encoded strings**
* **and binary data should be performed using `Buffer.from(str, 'base64')` and`buf.toString('base64')`.**
* @since v15.13.0, v14.17.0
* @legacy Use `Buffer.from(data, 'base64')` instead.
* @param data The Base64-encoded input string.
*/
function atob(data: string): string;
/**
* Decodes a string into bytes using Latin-1 (ISO-8859), and encodes those bytes
* into a string using Base64.
*
* The `data` may be any JavaScript-value that can be coerced into a string.
*
* **This function is only provided for compatibility with legacy web platform APIs**
* **and should never be used in new code, because they use strings to represent**
* **binary data and predate the introduction of typed arrays in JavaScript.**
* **For code running using Node.js APIs, converting between base64-encoded strings**
* **and binary data should be performed using `Buffer.from(str, 'base64')` and`buf.toString('base64')`.**
* @since v15.13.0, v14.17.0
* @legacy Use `buf.toString('base64')` instead.
* @param data An ASCII (Latin1) string.
*/
function btoa(data: string): string;
interface Blob extends __Blob {}
/**
* `Blob` class is a global reference for `require('node:buffer').Blob`
* https://nodejs.org/api/buffer.html#class-blob
* @since v18.0.0
*/
var Blob: typeof globalThis extends {
onmessage: any;
Blob: infer T;
} ? T
: typeof NodeBlob;
}
}
declare module "node:buffer" {
export * from "buffer";
}
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