CompressionStream: writable property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since May 2023.
Note: This feature is available in Web Workers.
The writable read-only property of the CompressionStream interface returns a WritableStream that accepts uncompressed data to be compressed, in the form of ArrayBuffer, TypedArray, or DataView chunks.
Value
Examples
This example creates a CompressionStream that performs gzip compression. It writes some binary data to the writable stream, then reads the compressed data from the readable stream.
js
const stream = new CompressionStream("gzip"); // Write data to be compressed const data = new TextEncoder().encode("Hello, world!"); const writer = stream.writable.getWriter(); writer.write(data); writer.close(); // Read compressed data const reader = stream.readable.getReader(); let done = false; let output = []; while (!done) { const result = await reader.read(); if (result.value) { output.push(...result.value); } done = result.done; } console.log(new Uint8Array(output).toBase64()); // H4sIAAAAAAAAE/NIzcnJ11Eozy/KSVEEAObG5usNAAAA Specifications
| Specification |
|---|
| Streams # dom-generictransformstream-writable |