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Frittoli","email":"info@alessiofrittoli.it","url":"https://alessiofrittoli.it"},"license":"MIT","homepage":"https://github.com/alessiofrittoli/stream-writer#readme","keywords":["stream","stream-writer","streaming"],"repository":{"type":"git","url":"git+https://github.com/alessiofrittoli/stream-writer.git"},"description":"Easly push data to a Stream","maintainers":[{"name":"alessiofrittoli","email":"info@alessiofrittoli.it"}],"readme":"# Stream Writer 🪶\n\n[![NPM Latest Version][version-badge]][npm-url] [![Coverage Status][coverage-badge]][coverage-url] [![Socket Status][socket-badge]][socket-url] [![NPM Monthly Downloads][downloads-badge]][npm-url] [![Dependencies][deps-badge]][deps-url]\n\n[![GitHub Sponsor][sponsor-badge]][sponsor-url]\n\n[version-badge]: https://img.shields.io/npm/v/%40alessiofrittoli%2Fstream-writer\n[npm-url]: https://npmjs.org/package/%40alessiofrittoli%2Fstream-writer\n[coverage-badge]: https://coveralls.io/repos/github/alessiofrittoli/stream-writer/badge.svg\n[coverage-url]: https://coveralls.io/github/alessiofrittoli/stream-writer\n[socket-badge]: https://socket.dev/api/badge/npm/package/@alessiofrittoli/stream-writer\n[socket-url]: https://socket.dev/npm/package/@alessiofrittoli/stream-writer/overview\n[downloads-badge]: https://img.shields.io/npm/dm/%40alessiofrittoli%2Fstream-writer.svg\n[deps-badge]: https://img.shields.io/librariesio/release/npm/%40alessiofrittoli%2Fstream-writer\n[deps-url]: https://libraries.io/npm/%40alessiofrittoli%2Fstream-writer\n\n[sponsor-badge]: https://img.shields.io/static/v1?label=Fund%20this%20package&message=%E2%9D%A4&logo=GitHub&color=%23DB61A2\n[sponsor-url]: https://github.com/sponsors/alessiofrittoli\n\n## Easly push data to a Stream\n\nThe `Stream` class extends the [`TransformStream`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream) interface, providing additional convenience methods for handling streams, such as writing, closing, and aborting reducing the amount of code required for those operations.\n\nIf you're interested in a simple and effective way to read streams, take a look at [`@alessiofrittoli/stream-reader`](https://npmjs.com/package/@alessiofrittoli/stream-reader) package.\n\n### Table of Contents\n\n- [Getting started](#getting-started)\n- [Key features](#key-features)\n- [API Reference](#api-reference)\n - [Importing the library](#importing-the-library)\n - [Properties](#properties)\n - [Constructor](#constructor)\n - [Methods](#methods)\n - [`Stream.write()`](#streamwrite)\n - [`Stream.close()`](#streamclose)\n - [`Stream.abort()`](#streamabort)\n- [Examples](#examples)\n - [Writing data into a stream](#writing-data-into-a-stream)\n - [Writing data into a stream with a custom transformer](#writing-data-into-a-stream-with-a-custom-transformer)\n - [Aborting the stream](#aborting-the-stream)\n- [Development](#development)\n - [Install depenendencies](#install-depenendencies)\n - [Build the source code](#build-the-source-code)\n - [ESLint](#eslint)\n - [Jest](#jest)\n- [Contributing](#contributing)\n- [Security](#security)\n- [Credits](#made-with-)\n\n---\n\n### Getting started\n\nRun the following command to start using `stream-writer` in your projects:\n\n```bash\nnpm i @alessiofrittoli/stream-writer\n```\n\nor using `pnpm`\n\n```bash\npnpm i @alessiofrittoli/stream-writer\n```\n\n---\n\n### Key features\n\n#### Extends `TransformStream`\n\n- Inherits all the functionality of the [`TransformStream`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream) API, allowing for custom transformations of input to output streams.\n- Provides seamless integration with modern streaming APIs.\n\n#### Convenient Stream Management\n\n- `write` Method: A high-level abstraction for writing chunks of data into the stream. It handles readiness and ensures proper sequencing of write operations.\n- `close` Method: Safely closes the stream while preventing multiple or concurrent close operations.\n- `abort` Method: Gracefully aborts the stream with an optional reason, making it easier to handle errors or interruptions.\n\n#### Built-In Headers for Server Responses\n\n- The `headers` property contains default headers commonly used in server responses, such as:\n - `Connection: keep-alive`\n - `Transfer-Encoding: chunked`\n - `Cache-Control: no-cache, no-transform`\n - `X-Accel-Buffering: no`\n - `Content-Encoding: none`\n\n#### Stream Writer Abstraction\n\n- The `writer` property provides direct access to the underlying `WritableStreamDefaultWriter`, enabling fine-grained control over the writable stream.\n- Ensures proper handling of stream readiness, errors, and resource management (e.g., releasing locks).\n\n#### Type Safety\n\n- Generic parameters (`I` for input, `O` for output) make the class type-safe and adaptable to various use cases, such as processing specific data types.\n\n#### Designed for Robustness\n\n- Internal mechanisms, ensure the class behaves predictably and avoids race conditions.\n\n#### Chainable API\n\n- Methods like `write`, `close`, and `abort` return the current `Stream` instance, enabling method chaining for more concise and readable code.\n\n#### Compatibility and Modularity\n\n- The `Stream` class can be used in both client-side and server-side applications where the `TransformStream` API is supported.\n- Its modular design makes it easy to extend or customize further for specific application needs.\n\n#### Focused on Developer Experience\n\n- Clear and concise API with thoughtful defaults.\n- Built-in documentation and examples make it easy to understand and integrate into existing projects.\n\nThese features make the `Stream` class a versatile and developer-friendly abstraction for working with streams in modern JavaScript and TypeScript environments.\n\n---\n\n### API Reference\n\n### Importing the library\n\n```ts\nimport { Stream } from '@alessiofrittoli/stream-writer'\n```\n\n---\n\n### Properties\n\n| Property | Type | Description |\n|------------|----------------------------------|------------------------------------------------|\n| `writable` | `WritableStream` | The writable stream instance. |\n| `readable` | `ReadableStream` | The readable stream instance. |\n| `writer` | `WritableStreamDefaultWriter` | The writer instance for the writable stream. |\n| `closed` | `boolean` | Indicates whether the stream is closed. |\n| `headers` | `Headers` | Common headers to return in a server response. |\n\n---\n\n### Constructor\n\nConstructs a new instance of the `Stream` class.\n\n| Parameter | Type | Description |\n|--------------------|----------------------|-------------------------------------------------------|\n| `transformer` | `Transformer` | (Optional) A custom transformer for the stream. |\n| `writableStrategy` | `QueuingStrategy` | (Optional) A custom strategy for the writable stream. |\n| `readableStrategy` | `QueuingStrategy` | (Optional) A custom strategy for the readable stream. |\n\n---\n\n### Methods\n\n#### `Stream.write()`\n\nWrites data into the stream.\n\n##### Parameters\n\n| Parameter | Type | Description |\n|-----------|------|----------------------------------------|\n| `chunk` | `I` | The data chunk to write to the stream. |\n\n##### Returns\n\nType: `Promise`\n\n- A Promise that resolves to the current `Stream` instance.\n\n---\n\n#### `Stream.close()`\n\nCloses the stream.\n\n- Closes the writer if it is not already closed or in the process of closing.\n- Prevents multiple close operations when .close() is not awaited.\n- Releases the lock on the writer.\n\n##### Returns\n\nType: `Promise`\n\n- A Promise that resolves to the current `Stream` instance.\n\n---\n\n#### `Stream.abort()`\n\nAborts the stream with an optional reason.\n\n##### Parameters\n\n| Parameter | Type | Description |\n|-----------|----------|------------------------------------------------|\n| `reason` | `string` | (Optional) The reason for aborting the stream. |\n\n##### Returns\n\nType: `Promise`\n\n- A Promise that resolves to the current `Stream` instance.\n\n---\n\n### Examples\n\n#### Writing data into a stream\n\n```ts\nconst routeHandler = () => {\n const stream = new Stream()\n \n const streamTask = async () => {\n await stream.write( 'data' )\n await stream.write( 'data 2' )\n await stream.write( 'data 3' )\n await stream.write( 'data 4' )\n }\n \n streamTask()\n .then( () => stream.close() )\n \n return new Response( stream.readable, { headers: stream.headers } )\n}\n```\n\n---\n\n#### Writing data into a stream with a custom transformer\n\n```ts\nconst routeHandler = () => {\n const encoder = new TextEncoder()\n const stream = (\n new Stream( {\n transform( chunk, controller )\n {\n controller.enqueue( encoder.encode( chunk ) )\n }\n } )\n )\n\n const streamTask = async () => {\n await stream.write( 'data' )\n await stream.write( 'data 2' )\n await stream.write( 'data 3' )\n await stream.write( 'data 4' )\n }\n\n streamTask()\n .then( () => stream.close() )\n\n return new Response( stream.readable, { headers: stream.headers } )\n}\n```\n\n---\n\n#### Aborting the stream\n\n```ts\nconst routeHandler = request => {\n request.signal.addEventListener( 'abort', () => {\n stream.abort( 'The user aborted the request.' )\n } )\n \n const stream = new Stream()\n \n const streamTask = async () => {\n await stream.write( 'data' )\n await stream.write( 'data 2' )\n await stream.write( 'data 3' )\n await stream.write( 'data 4' )\n }\n \n streamTask()\n .catch( error => {\n if ( error.name === 'AbortError' ) {\n return console.log( 'AbortError:', error.message )\n }\n await stream.write( error.message )\n } )\n .finally( () => stream.close() )\n \n return new Response( stream.readable, { headers: stream.headers } )\n\n}\n```\n\n---\n\nIf you're interested in a simple and effective way to read streams, take a look at [`@alessiofrittoli/stream-reader`](https://npmjs.com/package/@alessiofrittoli/stream-reader) package.\n\n---\n\n### Development\n\n#### Install depenendencies\n\n```bash\nnpm install\n```\n\nor using `pnpm`\n\n```bash\npnpm i\n```\n\n#### Build the source code\n\nRun the following command to test and build code for distribution.\n\n```bash\npnpm build\n```\n\n#### [ESLint](https://www.npmjs.com/package/eslint)\n\nwarnings / errors check.\n\n```bash\npnpm lint\n```\n\n#### [Jest](https://npmjs.com/package/jest)\n\nRun all the defined test suites by running the following:\n\n```bash\n# Run tests and watch file changes.\npnpm test:watch\n\n# Run tests in a CI environment.\npnpm test:ci\n```\n\n- See [`package.json`](./package.json) file scripts for more info.\n\nRun tests with coverage.\n\nAn HTTP server is then started to serve coverage files from `./coverage` folder.\n\n⚠️ You may see a blank page the first time you run this command. Simply refresh the browser to see the updates.\n\n```bash\ntest:coverage:serve\n```\n\n---\n\n### Contributing\n\nContributions are truly welcome!\n\nPlease refer to the [Contributing Doc](./CONTRIBUTING.md) for more information on how to start contributing to this project.\n\nHelp keep this project up to date with [GitHub Sponsor][sponsor-url].\n\n[![GitHub Sponsor][sponsor-badge]][sponsor-url]\n\n---\n\n### Security\n\nIf you believe you have found a security vulnerability, we encourage you to **_responsibly disclose this and NOT open a public issue_**. We will investigate all legitimate reports. Email `security@alessiofrittoli.it` to disclose any security vulnerabilities.\n\n### Made with ☕\n\n\n \n \n \n \n \n \n
\n \"avatar\"\n \n \n \n \n \n \n \n \n \n \n
\n Alessio Frittoli\n
\n \n https://alessiofrittoli.it |\n info@alessiofrittoli.it\n \n
\n
\n","readmeFilename":"README.md"}