--- displayed_sidebar: jsClientSidebar --- # Interface: ReadWriteStream [internal](../modules/internal-8.md).ReadWriteStream ## Hierarchy - [`ReadableStream`](internal-8.ReadableStream.md) - [`WritableStream`](internal-8.WritableStream.md) ↳ **`ReadWriteStream`** ## Properties ### readable • **readable**: `boolean` #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[readable](internal-8.ReadableStream.md#readable) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:210 ___ ### writable • **writable**: `boolean` #### Inherited from [WritableStream](internal-8.WritableStream.md).[writable](internal-8.WritableStream.md#writable) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:224 ## Methods ### [asyncIterator] ▸ **[asyncIterator]**(): [`AsyncIterableIterator`](internal-8.AsyncIterableIterator.md)<`string` \| [`Buffer`](../modules/internal-8.md#buffer)\> #### Returns [`AsyncIterableIterator`](internal-8.AsyncIterableIterator.md)<`string` \| [`Buffer`](../modules/internal-8.md#buffer)\> #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[[asyncIterator]](internal-8.ReadableStream.md#[asynciterator]) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:220 ___ ### addListener ▸ **addListener**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Alias for `emitter.on(eventName, listener)`. #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | | `listener` | (...`args`: `any`[]) => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.1.26 #### Inherited from [WritableStream](internal-8.WritableStream.md).[addListener](internal-8.WritableStream.md#addlistener) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:390 ___ ### emit ▸ **emit**(`eventName`, `...args`): `boolean` Synchronously calls each of the listeners registered for the event named`eventName`, in the order they were registered, passing the supplied arguments to each. Returns `true` if the event had listeners, `false` otherwise. ```js import { EventEmitter } from 'node:events'; const myEmitter = new EventEmitter(); // First listener myEmitter.on('event', function firstListener() { console.log('Helloooo! first listener'); }); // Second listener myEmitter.on('event', function secondListener(arg1, arg2) { console.log(`event with parameters ${arg1}, ${arg2} in second listener`); }); // Third listener myEmitter.on('event', function thirdListener(...args) { const parameters = args.join(', '); console.log(`event with parameters ${parameters} in third listener`); }); console.log(myEmitter.listeners('event')); myEmitter.emit('event', 1, 2, 3, 4, 5); // Prints: // [ // [Function: firstListener], // [Function: secondListener], // [Function: thirdListener] // ] // Helloooo! first listener // event with parameters 1, 2 in second listener // event with parameters 1, 2, 3, 4, 5 in third listener ``` #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | | `...args` | `any`[] | #### Returns `boolean` **`Since`** v0.1.26 #### Inherited from [WritableStream](internal-8.WritableStream.md).[emit](internal-8.WritableStream.md#emit) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:652 ___ ### end ▸ **end**(`cb?`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `cb?` | () => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [WritableStream](internal-8.WritableStream.md).[end](internal-8.WritableStream.md#end) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:227 ▸ **end**(`data`, `cb?`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `data` | `string` \| `Uint8Array` | | `cb?` | () => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [WritableStream](internal-8.WritableStream.md).[end](internal-8.WritableStream.md#end) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:228 ▸ **end**(`str`, `encoding?`, `cb?`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `str` | `string` | | `encoding?` | [`BufferEncoding`](../modules/internal-8.md#bufferencoding) | | `cb?` | () => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [WritableStream](internal-8.WritableStream.md).[end](internal-8.WritableStream.md#end) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:229 ___ ### eventNames ▸ **eventNames**(): (`string` \| `symbol`)[] Returns an array listing the events for which the emitter has registered listeners. The values in the array are strings or `Symbol`s. ```js import { EventEmitter } from 'node:events'; const myEE = new EventEmitter(); myEE.on('foo', () => {}); myEE.on('bar', () => {}); const sym = Symbol('symbol'); myEE.on(sym, () => {}); console.log(myEE.eventNames()); // Prints: [ 'foo', 'bar', Symbol(symbol) ] ``` #### Returns (`string` \| `symbol`)[] **`Since`** v6.0.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[eventNames](internal-8.WritableStream.md#eventnames) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:715 ___ ### getMaxListeners ▸ **getMaxListeners**(): `number` Returns the current max listener value for the `EventEmitter` which is either set by `emitter.setMaxListeners(n)` or defaults to defaultMaxListeners. #### Returns `number` **`Since`** v1.0.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[getMaxListeners](internal-8.WritableStream.md#getmaxlisteners) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:567 ___ ### isPaused ▸ **isPaused**(): `boolean` #### Returns `boolean` #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[isPaused](internal-8.ReadableStream.md#ispaused) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:215 ___ ### listenerCount ▸ **listenerCount**(`eventName`, `listener?`): `number` Returns the number of listeners listening for the event named `eventName`. If `listener` is provided, it will return how many times the listener is found in the list of the listeners of the event. #### Parameters | Name | Type | Description | | :------ | :------ | :------ | | `eventName` | `string` \| `symbol` | The name of the event being listened for | | `listener?` | `Function` | The event handler function | #### Returns `number` **`Since`** v3.2.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[listenerCount](internal-8.WritableStream.md#listenercount) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:661 ___ ### listeners ▸ **listeners**(`eventName`): `Function`[] Returns a copy of the array of listeners for the event named `eventName`. ```js server.on('connection', (stream) => { console.log('someone connected!'); }); console.log(util.inspect(server.listeners('connection'))); // Prints: [ [Function] ] ``` #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | #### Returns `Function`[] **`Since`** v0.1.26 #### Inherited from [WritableStream](internal-8.WritableStream.md).[listeners](internal-8.WritableStream.md#listeners) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:580 ___ ### off ▸ **off**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Alias for `emitter.removeListener()`. #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | | `listener` | (...`args`: `any`[]) => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v10.0.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[off](internal-8.WritableStream.md#off) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:540 ___ ### on ▸ **on**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Adds the `listener` function to the end of the listeners array for the event named `eventName`. No checks are made to see if the `listener` has already been added. Multiple calls passing the same combination of `eventName`and `listener` will result in the `listener` being added, and called, multiple times. ```js server.on('connection', (stream) => { console.log('someone connected!'); }); ``` Returns a reference to the `EventEmitter`, so that calls can be chained. By default, event listeners are invoked in the order they are added. The`emitter.prependListener()` method can be used as an alternative to add the event listener to the beginning of the listeners array. ```js import { EventEmitter } from 'node:events'; const myEE = new EventEmitter(); myEE.on('foo', () => console.log('a')); myEE.prependListener('foo', () => console.log('b')); myEE.emit('foo'); // Prints: // b // a ``` #### Parameters | Name | Type | Description | | :------ | :------ | :------ | | `eventName` | `string` \| `symbol` | The name of the event. | | `listener` | (...`args`: `any`[]) => `void` | The callback function | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.1.101 #### Inherited from [WritableStream](internal-8.WritableStream.md).[on](internal-8.WritableStream.md#on) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:422 ___ ### once ▸ **once**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Adds a **one-time**`listener` function for the event named `eventName`. The next time `eventName` is triggered, this listener is removed and then invoked. ```js server.once('connection', (stream) => { console.log('Ah, we have our first user!'); }); ``` Returns a reference to the `EventEmitter`, so that calls can be chained. By default, event listeners are invoked in the order they are added. The`emitter.prependOnceListener()` method can be used as an alternative to add the event listener to the beginning of the listeners array. ```js import { EventEmitter } from 'node:events'; const myEE = new EventEmitter(); myEE.once('foo', () => console.log('a')); myEE.prependOnceListener('foo', () => console.log('b')); myEE.emit('foo'); // Prints: // b // a ``` #### Parameters | Name | Type | Description | | :------ | :------ | :------ | | `eventName` | `string` \| `symbol` | The name of the event. | | `listener` | (...`args`: `any`[]) => `void` | The callback function | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.3.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[once](internal-8.WritableStream.md#once) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:452 ___ ### pause ▸ **pause**(): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[pause](internal-8.ReadableStream.md#pause) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:213 ___ ### pipe ▸ **pipe**<`T`\>(`destination`, `options?`): `T` #### Type parameters | Name | Type | | :------ | :------ | | `T` | extends [`WritableStream`](internal-8.WritableStream.md) | #### Parameters | Name | Type | | :------ | :------ | | `destination` | `T` | | `options?` | `Object` | | `options.end?` | `boolean` | #### Returns `T` #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[pipe](internal-8.ReadableStream.md#pipe) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:216 ___ ### prependListener ▸ **prependListener**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Adds the `listener` function to the _beginning_ of the listeners array for the event named `eventName`. No checks are made to see if the `listener` has already been added. Multiple calls passing the same combination of `eventName`and `listener` will result in the `listener` being added, and called, multiple times. ```js server.prependListener('connection', (stream) => { console.log('someone connected!'); }); ``` Returns a reference to the `EventEmitter`, so that calls can be chained. #### Parameters | Name | Type | Description | | :------ | :------ | :------ | | `eventName` | `string` \| `symbol` | The name of the event. | | `listener` | (...`args`: `any`[]) => `void` | The callback function | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v6.0.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[prependListener](internal-8.WritableStream.md#prependlistener) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:679 ___ ### prependOnceListener ▸ **prependOnceListener**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Adds a **one-time**`listener` function for the event named `eventName` to the _beginning_ of the listeners array. The next time `eventName` is triggered, this listener is removed, and then invoked. ```js server.prependOnceListener('connection', (stream) => { console.log('Ah, we have our first user!'); }); ``` Returns a reference to the `EventEmitter`, so that calls can be chained. #### Parameters | Name | Type | Description | | :------ | :------ | :------ | | `eventName` | `string` \| `symbol` | The name of the event. | | `listener` | (...`args`: `any`[]) => `void` | The callback function | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v6.0.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[prependOnceListener](internal-8.WritableStream.md#prependoncelistener) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:695 ___ ### rawListeners ▸ **rawListeners**(`eventName`): `Function`[] Returns a copy of the array of listeners for the event named `eventName`, including any wrappers (such as those created by `.once()`). ```js import { EventEmitter } from 'node:events'; const emitter = new EventEmitter(); emitter.once('log', () => console.log('log once')); // Returns a new Array with a function `onceWrapper` which has a property // `listener` which contains the original listener bound above const listeners = emitter.rawListeners('log'); const logFnWrapper = listeners[0]; // Logs "log once" to the console and does not unbind the `once` event logFnWrapper.listener(); // Logs "log once" to the console and removes the listener logFnWrapper(); emitter.on('log', () => console.log('log persistently')); // Will return a new Array with a single function bound by `.on()` above const newListeners = emitter.rawListeners('log'); // Logs "log persistently" twice newListeners[0](); emitter.emit('log'); ``` #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | #### Returns `Function`[] **`Since`** v9.4.0 #### Inherited from [WritableStream](internal-8.WritableStream.md).[rawListeners](internal-8.WritableStream.md#rawlisteners) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:611 ___ ### read ▸ **read**(`size?`): `string` \| [`Buffer`](../modules/internal-8.md#buffer) #### Parameters | Name | Type | | :------ | :------ | | `size?` | `number` | #### Returns `string` \| [`Buffer`](../modules/internal-8.md#buffer) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[read](internal-8.ReadableStream.md#read) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:211 ___ ### removeAllListeners ▸ **removeAllListeners**(`event?`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Removes all listeners, or those of the specified `eventName`. It is bad practice to remove listeners added elsewhere in the code, particularly when the `EventEmitter` instance was created by some other component or module (e.g. sockets or file streams). Returns a reference to the `EventEmitter`, so that calls can be chained. #### Parameters | Name | Type | | :------ | :------ | | `event?` | `string` \| `symbol` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.1.26 #### Inherited from [WritableStream](internal-8.WritableStream.md).[removeAllListeners](internal-8.WritableStream.md#removealllisteners) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:551 ___ ### removeListener ▸ **removeListener**(`eventName`, `listener`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) Removes the specified `listener` from the listener array for the event named`eventName`. ```js const callback = (stream) => { console.log('someone connected!'); }; server.on('connection', callback); // ... server.removeListener('connection', callback); ``` `removeListener()` will remove, at most, one instance of a listener from the listener array. If any single listener has been added multiple times to the listener array for the specified `eventName`, then `removeListener()` must be called multiple times to remove each instance. Once an event is emitted, all listeners attached to it at the time of emitting are called in order. This implies that any`removeListener()` or `removeAllListeners()` calls _after_ emitting and _before_ the last listener finishes execution will not remove them from`emit()` in progress. Subsequent events behave as expected. ```js import { EventEmitter } from 'node:events'; class MyEmitter extends EventEmitter {} const myEmitter = new MyEmitter(); const callbackA = () => { console.log('A'); myEmitter.removeListener('event', callbackB); }; const callbackB = () => { console.log('B'); }; myEmitter.on('event', callbackA); myEmitter.on('event', callbackB); // callbackA removes listener callbackB but it will still be called. // Internal listener array at time of emit [callbackA, callbackB] myEmitter.emit('event'); // Prints: // A // B // callbackB is now removed. // Internal listener array [callbackA] myEmitter.emit('event'); // Prints: // A ``` Because listeners are managed using an internal array, calling this will change the position indices of any listener registered _after_ the listener being removed. This will not impact the order in which listeners are called, but it means that any copies of the listener array as returned by the `emitter.listeners()` method will need to be recreated. When a single function has been added as a handler multiple times for a single event (as in the example below), `removeListener()` will remove the most recently added instance. In the example the `once('ping')`listener is removed: ```js import { EventEmitter } from 'node:events'; const ee = new EventEmitter(); function pong() { console.log('pong'); } ee.on('ping', pong); ee.once('ping', pong); ee.removeListener('ping', pong); ee.emit('ping'); ee.emit('ping'); ``` Returns a reference to the `EventEmitter`, so that calls can be chained. #### Parameters | Name | Type | | :------ | :------ | | `eventName` | `string` \| `symbol` | | `listener` | (...`args`: `any`[]) => `void` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.1.26 #### Inherited from [WritableStream](internal-8.WritableStream.md).[removeListener](internal-8.WritableStream.md#removelistener) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:535 ___ ### resume ▸ **resume**(): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[resume](internal-8.ReadableStream.md#resume) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:214 ___ ### setEncoding ▸ **setEncoding**(`encoding`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `encoding` | [`BufferEncoding`](../modules/internal-8.md#bufferencoding) | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[setEncoding](internal-8.ReadableStream.md#setencoding) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:212 ___ ### setMaxListeners ▸ **setMaxListeners**(`n`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) By default `EventEmitter`s will print a warning if more than `10` listeners are added for a particular event. This is a useful default that helps finding memory leaks. The `emitter.setMaxListeners()` method allows the limit to be modified for this specific `EventEmitter` instance. The value can be set to`Infinity` (or `0`) to indicate an unlimited number of listeners. Returns a reference to the `EventEmitter`, so that calls can be chained. #### Parameters | Name | Type | | :------ | :------ | | `n` | `number` | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) **`Since`** v0.3.5 #### Inherited from [WritableStream](internal-8.WritableStream.md).[setMaxListeners](internal-8.WritableStream.md#setmaxlisteners) #### Defined in packages/medusa-js/node_modules/@types/node/events.d.ts:561 ___ ### unpipe ▸ **unpipe**(`destination?`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `destination?` | [`WritableStream`](internal-8.WritableStream.md) | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[unpipe](internal-8.ReadableStream.md#unpipe) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:217 ___ ### unshift ▸ **unshift**(`chunk`, `encoding?`): `void` #### Parameters | Name | Type | | :------ | :------ | | `chunk` | `string` \| `Uint8Array` | | `encoding?` | [`BufferEncoding`](../modules/internal-8.md#bufferencoding) | #### Returns `void` #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[unshift](internal-8.ReadableStream.md#unshift) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:218 ___ ### wrap ▸ **wrap**(`oldStream`): [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Parameters | Name | Type | | :------ | :------ | | `oldStream` | [`ReadableStream`](internal-8.ReadableStream.md) | #### Returns [`ReadWriteStream`](internal-8.ReadWriteStream.md) #### Inherited from [ReadableStream](internal-8.ReadableStream.md).[wrap](internal-8.ReadableStream.md#wrap) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:219 ___ ### write ▸ **write**(`buffer`, `cb?`): `boolean` #### Parameters | Name | Type | | :------ | :------ | | `buffer` | `string` \| `Uint8Array` | | `cb?` | (`err?`: ``null`` \| [`Error`](../modules/internal-8.md#error)) => `void` | #### Returns `boolean` #### Inherited from [WritableStream](internal-8.WritableStream.md).[write](internal-8.WritableStream.md#write) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:225 ▸ **write**(`str`, `encoding?`, `cb?`): `boolean` #### Parameters | Name | Type | | :------ | :------ | | `str` | `string` | | `encoding?` | [`BufferEncoding`](../modules/internal-8.md#bufferencoding) | | `cb?` | (`err?`: ``null`` \| [`Error`](../modules/internal-8.md#error)) => `void` | #### Returns `boolean` #### Inherited from [WritableStream](internal-8.WritableStream.md).[write](internal-8.WritableStream.md#write) #### Defined in packages/medusa-js/node_modules/@types/node/globals.d.ts:226