Commit ec1a37a

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support whatwg-stream.ReadableStream

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Lines changed: 21 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,21 @@`
	`1`	`+// utility for whatwg streams`
	`2`	`+`
	`3`	`+export function isReadableStream<T>(object: unknown): object is ReadableStream<T> {`
	`4`	`+ return typeof ReadableStream !== "object" && object instanceof ReadableStream;`
	`5`	`+}`
	`6`	`+`
	`7`	`+export async function* asyncIterableFromStream<T>(stream: ReadableStream<T>): AsyncIterable<T> {`
	`8`	`+ const reader = stream.getReader();`
	`9`	`+`
	`10`	`+ try {`
	`11`	`+ while (true) {`
	`12`	`+ const { done, value } = await reader.read();`
	`13`	`+ if (done) {`
	`14`	`+ return;`
	`15`	`+ }`
	`16`	`+ yield value;`
	`17`	`+ }`
	`18`	`+ } finally {`
	`19`	`+ reader.releaseLock();`
	`20`	`+ }`
	`21`	`+}`

Lines changed: 26 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,8 +1,9 @@`
`1`	`1`	`import { deepStrictEqual } from "assert";`
`2`		`-import { encode, decode } from "../src";`
	`2`	`+import { encode, decode, decodeAsync } from "@msgpack/msgpack";`
	`3`	`+import { asyncIterableFromStream } from "../src/utils/stream";`
`3`	`4`
`4`	`5`	`describe("README", () => {`
`5`		`- context("#synopsis", () => {`
	`6`	`+ context("## Synopsis", () => {`
`6`	`7`	`it("runs", () => {`
`7`	`8`	`const object = {`
`8`	`9`	`nil: null,`
`@@ -21,4 +22,27 @@ describe("README", () => {`
`21`	`22`	`deepStrictEqual(decode(encoded), object);`
`22`	`23`	`});`
`23`	`24`	`});`
	`25`	`+`
	`26`	`+ context("## ReadableStream", () => {`
	`27`	`+ before(function() {`
	`28`	`+ if (typeof ReadableStream === "undefined") {`
	`29`	`+ this.skip();`
	`30`	`+ }`
	`31`	`+ });`
	`32`	`+`
	`33`	`+ it("reads from stream", async () => {`
	`34`	`+ const data = [1, 2, 3];`
	`35`	`+ const encoded = encode(data);`
	`36`	`+ const stream = new ReadableStream({`
	`37`	`+ start(controller) {`
	`38`	`+ for (const byte of encoded) {`
	`39`	`+ controller.enqueue([byte]);`
	`40`	`+ }`
	`41`	`+ controller.close();`
	`42`	`+ },`
	`43`	`+ });`
	`44`	`+`
	`45`	`+ deepStrictEqual(await decodeAsync(asyncIterableFromStream(stream)), data);`
	`46`	`+ });`
	`47`	`+ });`
`24`	`48`	`});`

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