From b5d69a823bebdccf28bd288a4da1e27214293e77 Mon Sep 17 00:00:00 2001 From: Matt Hargett Date: Tue, 21 Jul 2026 21:55:02 -0700 Subject: [PATCH 1/4] Add optional WHATWG Streams polyfill Vendor the ES5 web-streams-polyfill 4.3.0 ponyfill and expose an idempotent Streams initializer that preserves constructors supplied by the selected JavaScript engine. Cover readable, writable, transform, BYOB, error, tee, subclassing, and host-constructor behavior with focused ports from WPT plus Firefox and Chromium regression tests. Validate the implementation on JavaScriptCore under ASan/UBSan and QuickJS Release. --- CMakeLists.txt | 1 + Polyfills/CMakeLists.txt | 6 +- Polyfills/Streams/CMakeLists.txt | 30 ++++ .../Include/Babylon/Polyfills/Streams.h | 11 ++ Polyfills/Streams/README.md | 14 ++ Polyfills/Streams/Source/Streams.cpp | 55 ++++++ Polyfills/Streams/Source/StreamsScripts.h.in | 36 ++++ .../ThirdParty/web-streams-polyfill/LICENSE | 22 +++ .../web-streams-polyfill/ponyfill.es5.js | 8 + Tests/UnitTests/CMakeLists.txt | 1 + Tests/UnitTests/Scripts/tests.ts | 156 ++++++++++++++++++ Tests/UnitTests/Shared/Shared.cpp | 26 +++ 12 files changed, 365 insertions(+), 1 deletion(-) create mode 100644 Polyfills/Streams/CMakeLists.txt create mode 100644 Polyfills/Streams/Include/Babylon/Polyfills/Streams.h create mode 100644 Polyfills/Streams/README.md create mode 100644 Polyfills/Streams/Source/Streams.cpp create mode 100644 Polyfills/Streams/Source/StreamsScripts.h.in create mode 100644 Polyfills/Streams/ThirdParty/web-streams-polyfill/LICENSE create mode 100644 Polyfills/Streams/ThirdParty/web-streams-polyfill/ponyfill.es5.js diff --git a/CMakeLists.txt b/CMakeLists.txt index 21882d3e..6535a653 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -102,6 +102,7 @@ option(JSRUNTIMEHOST_POLYFILL_FILE "Include JsRuntimeHost Polyfill File and File option(JSRUNTIMEHOST_POLYFILL_PERFORMANCE "Include JsRuntimeHost Polyfill Performance." ON) option(JSRUNTIMEHOST_POLYFILL_TEXTDECODER "Include JsRuntimeHost Polyfill TextDecoder." ON) option(JSRUNTIMEHOST_POLYFILL_TEXTENCODER "Include JsRuntimeHost Polyfill TextEncoder." ON) +option(JSRUNTIMEHOST_POLYFILL_STREAMS "Include JsRuntimeHost Polyfill Web Streams." ON) # Sanitizers option(ENABLE_SANITIZERS "Enable AddressSanitizer and UBSan" OFF) diff --git a/Polyfills/CMakeLists.txt b/Polyfills/CMakeLists.txt index a44765fb..c952cf27 100644 --- a/Polyfills/CMakeLists.txt +++ b/Polyfills/CMakeLists.txt @@ -44,4 +44,8 @@ endif() if(JSRUNTIMEHOST_POLYFILL_TEXTENCODER) add_subdirectory(TextEncoder) -endif() \ No newline at end of file +endif() + +if(JSRUNTIMEHOST_POLYFILL_STREAMS) + add_subdirectory(Streams) +endif() diff --git a/Polyfills/Streams/CMakeLists.txt b/Polyfills/Streams/CMakeLists.txt new file mode 100644 index 00000000..6c00ed81 --- /dev/null +++ b/Polyfills/Streams/CMakeLists.txt @@ -0,0 +1,30 @@ +set(WEB_STREAMS_POLYFILL_FILE + "${CMAKE_CURRENT_SOURCE_DIR}/ThirdParty/web-streams-polyfill/ponyfill.es5.js") +set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS + "${WEB_STREAMS_POLYFILL_FILE}") +file(READ "${WEB_STREAMS_POLYFILL_FILE}" WEB_STREAMS_POLYFILL_SOURCE) +string(SUBSTRING "${WEB_STREAMS_POLYFILL_SOURCE}" 0 60000 WEB_STREAMS_POLYFILL_SOURCE_1) +string(SUBSTRING "${WEB_STREAMS_POLYFILL_SOURCE}" 60000 -1 WEB_STREAMS_POLYFILL_SOURCE_2) +configure_file( + "Source/StreamsScripts.h.in" + "${CMAKE_CURRENT_BINARY_DIR}/Generated/StreamsScripts.h" + @ONLY) + +set(SOURCES + "Include/Babylon/Polyfills/Streams.h" + "Source/Streams.cpp" + "Source/StreamsScripts.h.in" + "ThirdParty/web-streams-polyfill/LICENSE" + "ThirdParty/web-streams-polyfill/ponyfill.es5.js") + +add_library(Streams ${SOURCES}) +warnings_as_errors(Streams) + +target_include_directories(Streams + PUBLIC "Include" + PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/Generated") + +target_link_libraries(Streams PUBLIC JsRuntime) + +set_property(TARGET Streams PROPERTY FOLDER Polyfills) +source_group(TREE ${CMAKE_CURRENT_SOURCE_DIR} FILES ${SOURCES}) diff --git a/Polyfills/Streams/Include/Babylon/Polyfills/Streams.h b/Polyfills/Streams/Include/Babylon/Polyfills/Streams.h new file mode 100644 index 00000000..01e5a15c --- /dev/null +++ b/Polyfills/Streams/Include/Babylon/Polyfills/Streams.h @@ -0,0 +1,11 @@ +#pragma once + +#include +#include + +namespace Babylon::Polyfills::Streams +{ + // Installs the WHATWG Streams constructors that are not already supplied + // by the JavaScript engine. + void BABYLON_API Initialize(Napi::Env env); +} diff --git a/Polyfills/Streams/README.md b/Polyfills/Streams/README.md new file mode 100644 index 00000000..c84a38e3 --- /dev/null +++ b/Polyfills/Streams/README.md @@ -0,0 +1,14 @@ +# Web Streams + +Installs the standard `ReadableStream`, `WritableStream`, `TransformStream`, +reader, writer, controller, and queuing-strategy globals when the selected +JavaScript engine does not provide them. + +The implementation is the ES5 ponyfill bundle from +[`web-streams-polyfill` 4.3.0](https://github.com/MattiasBuelens/web-streams-polyfill/tree/add69059ed08eae6a18559aba49575a280d1529e), +which is based on the WHATWG reference implementation. The vendored project +tests this release against the Streams portion of WPT at revision +[`c05b4473`](https://github.com/web-platform-tests/wpt/tree/c05b447326585237713013c66341eab2cdf967b6/streams). + +`Initialize` preserves any Streams constructors already supplied by the host +engine and fills only missing globals. diff --git a/Polyfills/Streams/Source/Streams.cpp b/Polyfills/Streams/Source/Streams.cpp new file mode 100644 index 00000000..4552ed07 --- /dev/null +++ b/Polyfills/Streams/Source/Streams.cpp @@ -0,0 +1,55 @@ +#include + +#include "StreamsScripts.h" + +#include +#include + +namespace Babylon::Polyfills::Streams +{ + void BABYLON_API Initialize(Napi::Env env) + { + Napi::HandleScope scope{env}; + auto global = env.Global(); + + static constexpr std::array constructorNames{ + "ReadableStream", + "ReadableStreamDefaultController", + "ReadableByteStreamController", + "ReadableStreamBYOBRequest", + "ReadableStreamDefaultReader", + "ReadableStreamBYOBReader", + "WritableStream", + "WritableStreamDefaultController", + "WritableStreamDefaultWriter", + "ByteLengthQueuingStrategy", + "CountQueuingStrategy", + "TransformStream", + "TransformStreamDefaultController", + }; + + bool needsPonyfill{}; + for (const auto name : constructorNames) + { + if (global.Get(name.data()).IsUndefined()) + { + needsPonyfill = true; + break; + } + } + + if (!needsPonyfill) + { + return; + } + + const auto exports = Napi::Eval(env, Internal::StreamsScripts::Ponyfill.data(), "jsruntimehost://web-streams-polyfill.js").As(); + for (const auto name : constructorNames) + { + if (global.Get(name.data()).IsUndefined()) + { + global.Set(name.data(), exports.Get(name.data())); + } + } + } +} diff --git a/Polyfills/Streams/Source/StreamsScripts.h.in b/Polyfills/Streams/Source/StreamsScripts.h.in new file mode 100644 index 00000000..9bf7f5bf --- /dev/null +++ b/Polyfills/Streams/Source/StreamsScripts.h.in @@ -0,0 +1,36 @@ +#pragma once + +#include +#include + +namespace Babylon::Polyfills::Internal::StreamsScripts +{ + inline constexpr char PonyfillPart1[] = R"JSRHSTREAM( +(function() { + var exports = {}; + var module = { exports: exports }; +@WEB_STREAMS_POLYFILL_SOURCE_1@ +)JSRHSTREAM"; + + inline constexpr char PonyfillPart2[] = R"JSRHSTREAM(@WEB_STREAMS_POLYFILL_SOURCE_2@ + return module.exports; +})() +)JSRHSTREAM"; + + template + consteval auto Join(const char (&part1)[Part1Size], const char (&part2)[Part2Size]) + { + std::array result{}; + for (std::size_t index{}; index < Part1Size - 1; ++index) + { + result[index] = part1[index]; + } + for (std::size_t index{}; index < Part2Size; ++index) + { + result[Part1Size - 1 + index] = part2[index]; + } + return result; + } + + inline constexpr auto Ponyfill = Join(PonyfillPart1, PonyfillPart2); +} diff --git a/Polyfills/Streams/ThirdParty/web-streams-polyfill/LICENSE b/Polyfills/Streams/ThirdParty/web-streams-polyfill/LICENSE new file mode 100644 index 00000000..7adbcf57 --- /dev/null +++ b/Polyfills/Streams/ThirdParty/web-streams-polyfill/LICENSE @@ -0,0 +1,22 @@ +The MIT License (MIT) + +Copyright (c) 2026 Mattias Buelens +Copyright (c) 2016 Diwank Singh Tomer + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/Polyfills/Streams/ThirdParty/web-streams-polyfill/ponyfill.es5.js b/Polyfills/Streams/ThirdParty/web-streams-polyfill/ponyfill.es5.js new file mode 100644 index 00000000..18d63683 --- /dev/null +++ b/Polyfills/Streams/ThirdParty/web-streams-polyfill/ponyfill.es5.js @@ -0,0 +1,8 @@ +/** + * @license + * web-streams-polyfill v4.3.0 + * Copyright 2026 Mattias Buelens, Diwank Singh Tomer and other contributors. + * This code is released under the MIT license. + * SPDX-License-Identifier: MIT + */ +!function(e,r){"object"==typeof exports&&"undefined"!=typeof module?r(exports):"function"==typeof define&&define.amd?define(["exports"],r):r((e="undefined"!=typeof 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r=e._controlledReadableByteStream._state;return"errored"===r?null:"closed"===r?0:e._strategyHWM-e._queueTotalSize}function ar(e,r){var t=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==r)throw new TypeError("bytesWritten must be 0 when calling respond() on a closed stream")}else{if(0===r)throw new TypeError("bytesWritten must be greater than 0 when calling respond() on a readable stream");if(t.bytesFilled+r>t.byteLength)throw new RangeError("bytesWritten out of range")}t.buffer=pe(t.buffer),Ke(e,r)}function ur(e,r){var t=e._pendingPullIntos.peek();if("closed"===e._controlledReadableByteStream._state){if(0!==r.byteLength)throw new TypeError("The view's length must be 0 when calling respondWithNewView() on a closed stream")}else if(0===r.byteLength)throw new TypeError("The view's length must be greater than 0 when calling respondWithNewView() on a readable stream");if(t.byteOffset+t.bytesFilled!==r.byteOffset)throw new RangeError("The region 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e(){this._promise=void 0}return e.prototype._chunkSteps=function(e){this._promise=c({value:e,done:!1})},e.prototype._closeSteps=function(e){this._promise=c({value:e,done:!0})},e.prototype._errorSteps=function(e){this._promise=p(e)},e}();function yr(e){return!!o(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_readIntoRequests")&&e instanceof _r)}function gr(e,r,t,o){var n=e._ownerReadableStream;n._disturbed=!0,"errored"===n._state?o._errorSteps(n._storedError):function(e,r,t,o){var n,i=e._controlledReadableByteStream,a=r.constructor,u=ke(a),l=r.byteOffset,s=r.byteLength,c=t*u;try{n=pe(r.buffer)}catch(p){return void o._errorSteps(p)}var f={buffer:n,bufferByteLength:n.byteLength,byteOffset:l,byteLength:s,bytesFilled:0,minimumFill:c,elementSize:u,viewConstructor:a,readerType:"byob"};if(e._pendingPullIntos.length>0)return e._pendingPullIntos.push(f),void pr(i,o);if("closed"!==i._state){if(e._queueTotalSize>0){if(Ve(e,f)){var d=Ye(f);return Ge(e),void 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n=!1;"erroring"===o&&(n=!0,r=void 0);var i=f(function(t,o){e._pendingAbortRequest={_promise:void 0,_resolve:t,_reject:o,_reason:r,_wasAlreadyErroring:n}});return e._pendingAbortRequest._promise=i,n||Mr(e,r),i}function Lr(e){var r=e._state;if("closed"===r||"errored"===r)return p(new TypeError("The stream (in ".concat(r," state) is not in the writable state and cannot be closed")));var t,o=f(function(r,t){var o={_resolve:r,_reject:t};e._closeRequest=o}),n=e._writer;return void 0!==n&&e._backpressure&&"writable"===r&>(n),Oe(t=e._writableStreamController,Zr,0),nt(t),o}function Ir(e,r){"writable"!==e._state?xr(e):Mr(e,r)}function Mr(e,r){var t=e._writableStreamController;e._state="erroring",e._storedError=r;var o=e._writer;void 0!==o&&Xr(o,r),!function(e){if(void 0===e._inFlightWriteRequest&&void 0===e._inFlightCloseRequest)return!1;return!0}(e)&&t._started&&xr(e)}function xr(e){e._state="errored",e._writableStreamController[P]();var 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x(e,t),function(t){return w(e,r,[t])}}Object.defineProperties(co.prototype,{highWaterMark:{enumerable:!0},size:{enumerable:!0}}),"symbol"==typeof r.toStringTag&&Object.defineProperty(co.prototype,r.toStringTag,{value:"CountQueuingStrategy",configurable:!0});var vo=function(){function TransformStream(e,r,t){void 0===e&&(e={}),void 0===r&&(r={}),void 0===t&&(t={}),void 0===e&&(e=null);var o=Pr(r,"Second parameter"),n=Pr(t,"Third parameter"),i=function(e,r){M(e,r);var t=null==e?void 0:e.cancel,o=null==e?void 0:e.flush,n=null==e?void 0:e.readableType,i=null==e?void 0:e.start,a=null==e?void 0:e.transform,u=null==e?void 0:e.writableType;return{cancel:void 0===t?void 0:mo(t,e,"".concat(r," has member 'cancel' that")),flush:void 0===o?void 0:bo(o,e,"".concat(r," has member 'flush' that")),readableType:n,start:void 0===i?void 0:ho(i,e,"".concat(r," has member 'start' that")),transform:void 0===a?void 0:_o(a,e,"".concat(r," has member 'transform' that")),writableType:u}}(e,"First 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function(e){var r=e._transformStreamController;if(void 0!==r._finishPromise)return r._finishPromise;var t=e._readable;r._finishPromise=f(function(e,t){r._finishPromise_resolve=e,r._finishPromise_reject=t});var o=r._flushAlgorithm();return Co(r),h(o,function(){return"errored"===t._state?jo(r,t._storedError):(At(t._readableStreamController),Oo(r)),null},function(e){return Dt(t._readableStreamController,e),jo(r,e),null}),r._finishPromise}(e)}function c(){return function(e){return Ro(e,!1),e._backpressureChangePromise}(e)}function d(r){return function(e,r){var t=e._transformStreamController;if(void 0!==t._finishPromise)return t._finishPromise;var o=e._writable;t._finishPromise=f(function(e,r){t._finishPromise_resolve=e,t._finishPromise_reject=r});var n=t._cancelAlgorithm(r);return Co(t),h(n,function(){return"errored"===o._state?jo(t,o._storedError):(it(o._writableStreamController,r),wo(e),Oo(t)),null},function(r){return 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r;r=e,go(this._controlledTransformStream,r)},TransformStreamDefaultController.prototype.terminate=function(){if(!Po(this))throw Wo("terminate");!function(e){var r=e._controlledTransformStream;At(r._readable._readableStreamController);var t=new TypeError("TransformStream terminated");So(r,t)}(this)},TransformStreamDefaultController}();function Po(e){return!!o(e)&&(!!Object.prototype.hasOwnProperty.call(e,"_controlledTransformStream")&&e instanceof To)}function Co(e){e._transformAlgorithm=void 0,e._flushAlgorithm=void 0,e._cancelAlgorithm=void 0}function qo(e,r){var t=e._controlledTransformStream,o=t._readable._readableStreamController;if(!Lt(o))throw new TypeError("Readable side is not in a state that permits enqueue");try{zt(o,r)}catch(e){throw So(t,e),t._readable._storedError}var n=function(e){return!Bt(e)}(o);n!==t._backpressure&&Ro(t,!0)}function Eo(e,r){return v(e._transformAlgorithm(r),void 0,function(r){throw go(e._controlledTransformStream,r),r})}function Wo(e){return new TypeError("TransformStreamDefaultController.prototype.".concat(e," can only be used on a TransformStreamDefaultController"))}function Oo(e){void 0!==e._finishPromise_resolve&&(e._finishPromise_resolve(),e._finishPromise_resolve=void 0,e._finishPromise_reject=void 0)}function jo(e,r){void 0!==e._finishPromise_reject&&(y(e._finishPromise),e._finishPromise_reject(r),e._finishPromise_resolve=void 0,e._finishPromise_reject=void 0)}function Bo(e){return new TypeError("TransformStream.prototype.".concat(e," can only be used on a TransformStream"))}Object.defineProperties(To.prototype,{enqueue:{enumerable:!0},error:{enumerable:!0},terminate:{enumerable:!0},desiredSize:{enumerable:!0}}),i(To.prototype.enqueue,"enqueue"),i(To.prototype.error,"error"),i(To.prototype.terminate,"terminate"),"symbol"==typeof r.toStringTag&&Object.defineProperty(To.prototype,r.toStringTag,{value:"TransformStreamDefaultController",configurable:!0}),e.ByteLengthQueuingStrategy=ao,e.CountQueuingStrategy=co,e.ReadableByteStreamController=ze,e.ReadableStream=Gt,e.ReadableStreamBYOBReader=_r,e.ReadableStreamBYOBRequest=Ae,e.ReadableStreamDefaultController=Wt,e.ReadableStreamDefaultReader=ee,e.TransformStream=vo,e.TransformStreamDefaultController=To,e.WritableStream=Br,e.WritableStreamDefaultController=$r,e.WritableStreamDefaultWriter=Hr}); diff --git a/Tests/UnitTests/CMakeLists.txt b/Tests/UnitTests/CMakeLists.txt index f3676d7d..254b10dc 100644 --- a/Tests/UnitTests/CMakeLists.txt +++ b/Tests/UnitTests/CMakeLists.txt @@ -78,6 +78,7 @@ target_link_libraries(UnitTests PRIVATE Performance PRIVATE TextDecoder PRIVATE TextEncoder + PRIVATE Streams ${ADDITIONAL_LIBRARIES}) # See https://gitlab.kitware.com/cmake/cmake/-/issues/23543 diff --git a/Tests/UnitTests/Scripts/tests.ts b/Tests/UnitTests/Scripts/tests.ts index 654c60b6..6b153c59 100644 --- a/Tests/UnitTests/Scripts/tests.ts +++ b/Tests/UnitTests/Scripts/tests.ts @@ -1541,6 +1541,162 @@ describe("Console", function () { }); }); +describe("Web Streams", function () { + // Focused ports from the WHATWG Streams WPT suites at c05b4473: + // readable-streams/general.any.js and tee.any.js, + // writable-streams/write.any.js, and transform-streams/general.any.js. + it("installs the standard stream constructors", function () { + expect(ReadableStream).to.be.a("function"); + expect(WritableStream).to.be.a("function"); + expect(TransformStream).to.be.a("function"); + expect(ByteLengthQueuingStrategy).to.be.a("function"); + expect(CountQueuingStrategy).to.be.a("function"); + }); + + it("delivers queued chunks in order and closes the reader", async function () { + const stream = new ReadableStream({ + start(controller) { + controller.enqueue("a"); + controller.enqueue("b"); + controller.close(); + } + }); + const reader = stream.getReader(); + + expect(await reader.read()).to.deep.equal({ value: "a", done: false }); + expect(await reader.read()).to.deep.equal({ value: "b", done: false }); + expect(await reader.read()).to.deep.equal({ value: undefined, done: true }); + await reader.closed; + }); + + it("propagates a rejected pull to read and closed", async function () { + const failure = new Error("pull failed"); + const reader = new ReadableStream({ + pull() { + return Promise.reject(failure); + } + }).getReader(); + + let readFailure: unknown; + let closedFailure: unknown; + try { await reader.read(); } catch (error) { readFailure = error; } + try { await reader.closed; } catch (error) { closedFailure = error; } + expect(readFailure).to.equal(failure); + expect(closedFailure).to.equal(failure); + }); + + it("tees without one branch consuming the other", async function () { + const [first, second] = new ReadableStream({ + start(controller) { + controller.enqueue("a"); + controller.enqueue("b"); + controller.close(); + } + }).tee(); + const firstReader = first.getReader(); + const secondReader = second.getReader(); + + expect(await firstReader.read()).to.deep.equal({ value: "a", done: false }); + expect(await firstReader.read()).to.deep.equal({ value: "b", done: false }); + expect(await firstReader.read()).to.deep.equal({ value: undefined, done: true }); + expect(await secondReader.read()).to.deep.equal({ value: "a", done: false }); + }); + + it("waits for asynchronous writes before closing", async function () { + const stored: number[] = []; + const writable = new WritableStream({ + write(chunk) { + return Promise.resolve().then(() => stored.push(chunk)); + } + }); + const writer = writable.getWriter(); + + writer.write(1); + writer.write(2); + await writer.close(); + expect(stored).to.deep.equal([1, 2]); + }); + + it("applies transform output and backpressure", async function () { + const transform = new TransformStream({ + transform(chunk, controller) { + controller.enqueue(chunk.toUpperCase()); + } + }); + const writer = transform.writable.getWriter(); + const reader = transform.readable.getReader(); + const write = writer.write("native"); + + expect(await reader.read()).to.deep.equal({ value: "NATIVE", done: false }); + await write; + await writer.close(); + expect(await reader.read()).to.deep.equal({ value: undefined, done: true }); + }); + + it("supports BYOB reads from byte streams", async function () { + let sent = false; + const stream = new ReadableStream({ + type: "bytes", + pull(controller) { + if (!sent) { + sent = true; + controller.enqueue(new Uint8Array([8, 241, 48, 123, 151])); + controller.close(); + } + } + } as any); + const reader = stream.getReader({ mode: "byob" }); + const result = await reader.read(new Uint8Array(8)); + + expect(result.done).to.equal(false); + expect(Array.from(result.value!)).to.deep.equal([8, 241, 48, 123, 151]); + expect((await reader.read(new Uint8Array(8))).done).to.equal(true); + }); + + // Ported from Firefox's dom/streams/test/xpcshell/subclassing.js. + it("supports subclassed streams, readers, and queuing strategies", async function () { + class SubclassedStream extends ReadableStream {} + class SubclassedStrategy extends CountQueuingStrategy {} + const stream = new SubclassedStream({ + start(controller) { + controller.enqueue("first"); + controller.close(); + } + }); + const Reader = stream.getReader().constructor as typeof ReadableStreamDefaultReader; + class SubclassedReader extends Reader {} + + expect(stream).to.be.instanceOf(ReadableStream); + expect(new SubclassedStrategy({ highWaterMark: 4 }).highWaterMark).to.equal(4); + + const secondStream = new ReadableStream({ + start(controller) { + controller.enqueue("second"); + controller.close(); + } + }); + const reader = new SubclassedReader(secondStream); + expect(await reader.read()).to.deep.equal({ value: "second", done: false }); + }); + + // Ported from Chromium's http/tests/streams/chromium/transform-stream-enqueue.html. + it("rejects enqueues after a transform is terminated or errored", function () { + expect(() => new TransformStream({ + start(controller) { + controller.terminate(); + controller.enqueue("late"); + } + })).to.throw(TypeError); + + expect(() => new TransformStream({ + start(controller) { + controller.error(new Error("failed")); + controller.enqueue("late"); + } + })).to.throw(TypeError); + }); +}); + describe("Blob", function () { let emptyBlobs: Blob[], helloBlobs: Blob[], stringBlob: Blob, typedArrayBlob: Blob, arrayBufferBlob: Blob, blobBlob: Blob; diff --git a/Tests/UnitTests/Shared/Shared.cpp b/Tests/UnitTests/Shared/Shared.cpp index 1c7e9ff7..b71218bd 100644 --- a/Tests/UnitTests/Shared/Shared.cpp +++ b/Tests/UnitTests/Shared/Shared.cpp @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -90,6 +91,7 @@ TEST(JavaScript, All) Babylon::Polyfills::File::Initialize(env); Babylon::Polyfills::TextDecoder::Initialize(env); Babylon::Polyfills::TextEncoder::Initialize(env); + Babylon::Polyfills::Streams::Initialize(env); auto setExitCodeCallback = Napi::Function::New( env, [&exitCodePromise](const Napi::CallbackInfo& info) { @@ -166,6 +168,30 @@ TEST(Scheduling, IntervalSurvivesThrowingCallback) EXPECT_EQ(unhandledErrorCount.load(), 2); } +TEST(Streams, PreservesHostConstructorsAndIsIdempotent) +{ + Babylon::AppRuntime runtime{}; + std::promise done; + + runtime.Dispatch([&done](Napi::Env env) { + auto global = env.Global(); + const auto hostReadableStream = Napi::Function::New(env, [](const Napi::CallbackInfo&) {}, "HostReadableStream"); + global.Set("ReadableStream", hostReadableStream); + + Babylon::Polyfills::Streams::Initialize(env); + EXPECT_TRUE(global.Get("ReadableStream").StrictEquals(hostReadableStream)); + EXPECT_TRUE(global.Get("TransformStream").IsFunction()); + + const auto installedTransformStream = global.Get("TransformStream"); + Babylon::Polyfills::Streams::Initialize(env); + EXPECT_TRUE(global.Get("ReadableStream").StrictEquals(hostReadableStream)); + EXPECT_TRUE(global.Get("TransformStream").StrictEquals(installedTransformStream)); + done.set_value(); + }); + + done.get_future().get(); +} + TEST(Console, Log) { Babylon::AppRuntime runtime{}; From 9dc464aac071b157292a34b6081b1cc59d42d45e Mon Sep 17 00:00:00 2001 From: Matt Hargett Date: Wed, 22 Jul 2026 00:26:50 -0700 Subject: [PATCH 2/4] Keep Streams implementations internally consistent Replace a partial or null host Streams surface as a complete constructor suite so stream products retain compatible instanceof relationships. Preserve a complete suite on repeated initialization.\n\nHarden the native initialization test so N-API failures complete the test promise instead of hanging, and cover partial host replacement plus null handling and cross-constructor compatibility. --- Polyfills/Streams/Source/Streams.cpp | 8 ++---- Tests/UnitTests/Shared/Shared.cpp | 42 +++++++++++++++++++++------- 2 files changed, 35 insertions(+), 15 deletions(-) diff --git a/Polyfills/Streams/Source/Streams.cpp b/Polyfills/Streams/Source/Streams.cpp index 4552ed07..e742344f 100644 --- a/Polyfills/Streams/Source/Streams.cpp +++ b/Polyfills/Streams/Source/Streams.cpp @@ -31,7 +31,8 @@ namespace Babylon::Polyfills::Streams bool needsPonyfill{}; for (const auto name : constructorNames) { - if (global.Get(name.data()).IsUndefined()) + const auto constructor = global.Get(name.data()); + if (constructor.IsUndefined() || constructor.IsNull()) { needsPonyfill = true; break; @@ -46,10 +47,7 @@ namespace Babylon::Polyfills::Streams const auto exports = Napi::Eval(env, Internal::StreamsScripts::Ponyfill.data(), "jsruntimehost://web-streams-polyfill.js").As(); for (const auto name : constructorNames) { - if (global.Get(name.data()).IsUndefined()) - { - global.Set(name.data(), exports.Get(name.data())); - } + global.Set(name.data(), exports.Get(name.data())); } } } diff --git a/Tests/UnitTests/Shared/Shared.cpp b/Tests/UnitTests/Shared/Shared.cpp index b71218bd..f27cad71 100644 --- a/Tests/UnitTests/Shared/Shared.cpp +++ b/Tests/UnitTests/Shared/Shared.cpp @@ -168,28 +168,50 @@ TEST(Scheduling, IntervalSurvivesThrowingCallback) EXPECT_EQ(unhandledErrorCount.load(), 2); } -TEST(Streams, PreservesHostConstructorsAndIsIdempotent) +TEST(Streams, ReplacesPartialHostSuiteAndIsIdempotent) { - Babylon::AppRuntime runtime{}; - std::promise done; + std::promise done; + std::atomic_bool completed{}; + const auto complete = [&done, &completed](std::string result) { + if (!completed.exchange(true)) + { + done.set_value(std::move(result)); + } + }; + + Babylon::AppRuntime::Options options{}; + options.UnhandledExceptionHandler = [&complete](const Napi::Error& error) { + complete(Napi::GetErrorString(error)); + }; + Babylon::AppRuntime runtime{options}; - runtime.Dispatch([&done](Napi::Env env) { + runtime.Dispatch([&complete](Napi::Env env) { auto global = env.Global(); const auto hostReadableStream = Napi::Function::New(env, [](const Napi::CallbackInfo&) {}, "HostReadableStream"); global.Set("ReadableStream", hostReadableStream); + global.Set("TransformStream", env.Null()); Babylon::Polyfills::Streams::Initialize(env); - EXPECT_TRUE(global.Get("ReadableStream").StrictEquals(hostReadableStream)); - EXPECT_TRUE(global.Get("TransformStream").IsFunction()); - + const auto installedReadableStream = global.Get("ReadableStream"); const auto installedTransformStream = global.Get("TransformStream"); + EXPECT_FALSE(installedReadableStream.StrictEquals(hostReadableStream)); + if (!installedReadableStream.IsFunction() || !installedTransformStream.IsFunction()) + { + complete("Streams::Initialize did not install a complete constructor suite."); + return; + } + + const auto transform = installedTransformStream.As().New({}); + EXPECT_TRUE(transform.Get("readable").As().InstanceOf(installedReadableStream.As())); + Babylon::Polyfills::Streams::Initialize(env); - EXPECT_TRUE(global.Get("ReadableStream").StrictEquals(hostReadableStream)); + EXPECT_TRUE(global.Get("ReadableStream").StrictEquals(installedReadableStream)); EXPECT_TRUE(global.Get("TransformStream").StrictEquals(installedTransformStream)); - done.set_value(); + complete({}); }); - done.get_future().get(); + const auto error = done.get_future().get(); + EXPECT_TRUE(error.empty()) << error; } TEST(Console, Log) From 54c2d6e20fd10961279977ee2c81e920f3bed4a0 Mon Sep 17 00:00:00 2001 From: Matt Hargett Date: Sun, 26 Jul 2026 02:14:45 -0700 Subject: [PATCH 3/4] Preserve Streams bundle bytes across source splits --- Polyfills/Streams/Source/StreamsScripts.h.in | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/Polyfills/Streams/Source/StreamsScripts.h.in b/Polyfills/Streams/Source/StreamsScripts.h.in index 9bf7f5bf..126a23f7 100644 --- a/Polyfills/Streams/Source/StreamsScripts.h.in +++ b/Polyfills/Streams/Source/StreamsScripts.h.in @@ -9,9 +9,10 @@ namespace Babylon::Polyfills::Internal::StreamsScripts (function() { var exports = {}; var module = { exports: exports }; -@WEB_STREAMS_POLYFILL_SOURCE_1@ -)JSRHSTREAM"; +@WEB_STREAMS_POLYFILL_SOURCE_1@)JSRHSTREAM"; + // Keep the split transparent: inserting whitespace here can divide an + // identifier or string literal when the vendored bundle is regenerated. inline constexpr char PonyfillPart2[] = R"JSRHSTREAM(@WEB_STREAMS_POLYFILL_SOURCE_2@ return module.exports; })() From 9b273a4339df3585582e72559c7861e6c134fedc Mon Sep 17 00:00:00 2001 From: Matt Hargett Date: Sun, 13 Sep 2026 02:56:11 -0500 Subject: [PATCH 4/4] Streams: emit the embedded bundle as <=16 KB literals; link Streams into the Android test host MSVC caps a single string literal at 16,380 bytes (C2026) and a concatenated one at 65,535; the 71 KB bundle was emitted as two 60,000/11,188-byte raw strings, so every Windows and UWP job failed at "Build Solution". CMake now emits consecutive parts of at most 16,000 bytes, abutting with no separator (the split stays byte-transparent), and a variadic consteval Join reassembles them into the same std::array as before. The desktop UnitTests target links Streams for the Shared.cpp coverage but the Android UnitTestsJNI host did not, so the Android build failed on the include. --- Polyfills/Streams/CMakeLists.txt | 26 ++++++++++++- Polyfills/Streams/Source/StreamsScripts.h.in | 37 ++++++++++--------- .../Android/app/src/main/cpp/CMakeLists.txt | 3 +- 3 files changed, 46 insertions(+), 20 deletions(-) diff --git a/Polyfills/Streams/CMakeLists.txt b/Polyfills/Streams/CMakeLists.txt index 6c00ed81..6a756ccc 100644 --- a/Polyfills/Streams/CMakeLists.txt +++ b/Polyfills/Streams/CMakeLists.txt @@ -3,8 +3,30 @@ set(WEB_STREAMS_POLYFILL_FILE set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS "${WEB_STREAMS_POLYFILL_FILE}") file(READ "${WEB_STREAMS_POLYFILL_FILE}" WEB_STREAMS_POLYFILL_SOURCE) -string(SUBSTRING "${WEB_STREAMS_POLYFILL_SOURCE}" 0 60000 WEB_STREAMS_POLYFILL_SOURCE_1) -string(SUBSTRING "${WEB_STREAMS_POLYFILL_SOURCE}" 60000 -1 WEB_STREAMS_POLYFILL_SOURCE_2) +# MSVC caps a single string literal at 16,380 bytes (C2026) and a concatenated one at 65,535, so +# the bundle is emitted as consecutive raw-string parts of at most 16,000 bytes and joined back +# into one array at compile time. Parts abut with no separator so the split stays byte-transparent +# (a separator could land inside an identifier or string literal when the bundle is regenerated). +string(LENGTH "${WEB_STREAMS_POLYFILL_SOURCE}" _streams_length) +set(_streams_part_size 16000) +set(_streams_offset 0) +set(_streams_index 0) +set(WEB_STREAMS_POLYFILL_PARTS "") +set(WEB_STREAMS_POLYFILL_PART_NAMES "") +while(_streams_offset LESS _streams_length) + math(EXPR _streams_index "${_streams_index} + 1") + math(EXPR _streams_remaining "${_streams_length} - ${_streams_offset}") + if(_streams_remaining LESS _streams_part_size) + set(_streams_take ${_streams_remaining}) + else() + set(_streams_take ${_streams_part_size}) + endif() + string(SUBSTRING "${WEB_STREAMS_POLYFILL_SOURCE}" ${_streams_offset} ${_streams_take} _streams_part) + string(APPEND WEB_STREAMS_POLYFILL_PARTS + " inline constexpr char PonyfillPart${_streams_index}[] = R\"JSRHSTREAM(${_streams_part})JSRHSTREAM\";\n") + string(APPEND WEB_STREAMS_POLYFILL_PART_NAMES ", PonyfillPart${_streams_index}") + math(EXPR _streams_offset "${_streams_offset} + ${_streams_take}") +endwhile() configure_file( "Source/StreamsScripts.h.in" "${CMAKE_CURRENT_BINARY_DIR}/Generated/StreamsScripts.h" diff --git a/Polyfills/Streams/Source/StreamsScripts.h.in b/Polyfills/Streams/Source/StreamsScripts.h.in index 126a23f7..6b145ef5 100644 --- a/Polyfills/Streams/Source/StreamsScripts.h.in +++ b/Polyfills/Streams/Source/StreamsScripts.h.in @@ -5,33 +5,36 @@ namespace Babylon::Polyfills::Internal::StreamsScripts { - inline constexpr char PonyfillPart1[] = R"JSRHSTREAM( + // The vendored bundle is split by CMake into PonyfillPart1..N raw-string literals of at most + // 16,000 bytes each (MSVC C2026) and joined below. The prologue and epilogue wrap it as a + // CommonJS module so its exports can be read back. Nothing is inserted between parts: a + // separator could divide an identifier or string literal when the bundle is regenerated. + inline constexpr char PonyfillPrologue[] = R"JSRHSTREAM( (function() { var exports = {}; var module = { exports: exports }; -@WEB_STREAMS_POLYFILL_SOURCE_1@)JSRHSTREAM"; +)JSRHSTREAM"; - // Keep the split transparent: inserting whitespace here can divide an - // identifier or string literal when the vendored bundle is regenerated. - inline constexpr char PonyfillPart2[] = R"JSRHSTREAM(@WEB_STREAMS_POLYFILL_SOURCE_2@ +@WEB_STREAMS_POLYFILL_PARTS@ + inline constexpr char PonyfillEpilogue[] = R"JSRHSTREAM( return module.exports; })() )JSRHSTREAM"; - template - consteval auto Join(const char (&part1)[Part1Size], const char (&part2)[Part2Size]) + template + consteval auto Join(const char (&... parts)[Sizes]) { - std::array result{}; - for (std::size_t index{}; index < Part1Size - 1; ++index) - { - result[index] = part1[index]; - } - for (std::size_t index{}; index < Part2Size; ++index) - { - result[Part1Size - 1 + index] = part2[index]; - } + std::array result{}; + std::size_t offset{}; + auto append = [&](const char* part, std::size_t size) { + for (std::size_t index{}; index + 1 < size; ++index) + { + result[offset++] = part[index]; + } + }; + (append(parts, Sizes), ...); return result; } - inline constexpr auto Ponyfill = Join(PonyfillPart1, PonyfillPart2); + inline constexpr auto Ponyfill = Join(PonyfillPrologue@WEB_STREAMS_POLYFILL_PART_NAMES@, PonyfillEpilogue); } diff --git a/Tests/UnitTests/Android/app/src/main/cpp/CMakeLists.txt b/Tests/UnitTests/Android/app/src/main/cpp/CMakeLists.txt index 2e31e0fb..844fa056 100644 --- a/Tests/UnitTests/Android/app/src/main/cpp/CMakeLists.txt +++ b/Tests/UnitTests/Android/app/src/main/cpp/CMakeLists.txt @@ -55,4 +55,5 @@ target_link_libraries(UnitTestsJNI PRIVATE File PRIVATE TextDecoder PRIVATE TextEncoder - PRIVATE Performance) + PRIVATE Performance + PRIVATE Streams) \ No newline at end of file