/
to_writable_stream.ts
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/
to_writable_stream.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import { writeAll } from "./write_all.ts";
import type { Writer } from "./types.ts";
import { isCloser } from "./_common.ts";
/** Options for {@linkcode toWritableStream}. */
export interface toWritableStreamOptions {
/**
* If the `writer` is also a `Closer`, automatically close the `writer`
* when the stream is closed, aborted, or a write error occurs.
*
* @default {true}
*/
autoClose?: boolean;
}
/**
* Create a {@linkcode WritableStream} from a {@linkcode Writer}.
*
* @example
* ```ts
* import { toWritableStream } from "https://deno.land/std@$STD_VERSION/io/to_writable_stream.ts";
*
* const file = await Deno.open("./file.txt", { create: true, write: true });
* await ReadableStream.from("Hello World")
* .pipeThrough(new TextEncoderStream())
* .pipeTo(toWritableStream(file));
* ```
*/
export function toWritableStream(
writer: Writer,
{ autoClose = true }: toWritableStreamOptions = {},
): WritableStream<Uint8Array> {
return new WritableStream({
async write(chunk, controller) {
try {
await writeAll(writer, chunk);
} catch (e) {
controller.error(e);
if (isCloser(writer) && autoClose) {
writer.close();
}
}
},
close() {
if (isCloser(writer) && autoClose) {
writer.close();
}
},
abort() {
if (isCloser(writer) && autoClose) {
writer.close();
}
},
});
}