`wasm-bindgen` Change Log

Unreleased

Added

Added support for arbitrary expressions when using #[wasm_bindgen(typescript_custom_section)]. #3901
Implement From<NonNull<T>> for JsValue. #3877
Add method copy_within for TypedArray, add methods find_last,find_last_index for Array. #3888
Added support for returning Vecs from async functions. #3630
Added bindings for InputDeviceInfo and MediaTrackCapabilities. #3935
Add bindings for RTCRtpReceiver.getCapabilities(DOMString) method. #3941

Changed

Stabilize Web Share API. #3882
Generate JS bindings for WebIDL dictionary setters instead of using Reflect. This increases the size of the Web API bindings but should be more performant. Also, importing getters/setters from JS now supports specifying the JS attribute name as a string, e.g. #[wasm_bindgen(method, setter = "x-cdm-codecs")]. #3898

Fixed

Copy port from headless test server when using WASM_BINDGEN_TEST_ADDRESS. #3873
Fix catch not being thread-safe. #3879
Fix MSRV compilation. #3927
Fixed clippy::empty_docs lint. #3946

0.2.92

Released 2024-03-04

Added

Add bindings for RTCPeerConnectionIceErrorEvent. #3835
Add bindings for CanvasState.reset(), affecting CanvasRenderingContext2D and OffscreenCanvasRenderingContext2D. #3844
Add TryFrom implementations for Number, that allow losslessly converting from 64- and 128-bits numbers. #3847
Add support for Option<*const T>, Option<*mut T> and NonNull<T>. #3852 #3857
Allow overriding the URL used for headless tests by setting WASM_BINDGEN_TEST_ADDRESS. #3861

Fixed

Make .wasm output deterministic when using --reference-types. #3851
Don't allow invalid Unicode scalar values in char. #3866

0.2.91

Released 2024-02-06

Added

Added bindings for the RTCRtpTransceiver.setCodecPreferences() and unstable bindings for the RTCRtpEncodingParameters.scalabilityMode. #3828
Add unstable bindings for the FileSystemAccess API #3810
Added support for running tests in shared and service workers with wasm_bindgen_test_configure! run_in_shared_worker and run_in_service_worker. #3804
Accept the --skip flag with wasm-bindgen-test-runner. #3803
Introduce environment variable WASM_BINDGEN_TEST_NO_ORIGIN_ISOLATION to disable origin isolation for wasm-bindgen-test-runner. #3807
Add bindings for USBDevice.forget(). #3821

Changed

Stabilize ClipboardEvent. #3791
Use immutable buffers in SubtleCrypto methods. #3797
Deprecate wasm_bindgen_test_configure!s run_in_worker in favor of run_in_dedicated_worker. #3804
Updated the WebGPU WebIDL to the current draft as of 2024-01-30. Note that this retains the previous update's workaround for GPUPipelineError, and holds back an update to the buffer argument of the GPUQueue.{writeBuffer,writeTexture} methods. #3816
Depreate --weak-refs and WASM_BINDGEN_WEAKREF in favor of automatic run-time detection. #3822

Fixed

Fixed UB when freeing strings received from JS if not using the default allocator. #3808
Fixed temporary folder detection by wasm-bindgen-test-runner on MacOS. #3817
Fixed using #[wasm_bindgen(js_name = default)] with #[wasm_bindgen(module = ...)]. #3823
Fixed nighly build of wasm-bindgen-futures. #3827

0.2.90

Released 2024-01-06

Fixed

Fix JS shim default path detection for the no-modules target. #3748

Added

Add bindings for HTMLFormElement.requestSubmit(). #3747
Add bindings for RTCRtpSender.getCapabilities(DOMString) method, RTCRtpCapabilities, RTCRtpCodecCapability and RTCRtpHeaderExtensionCapability. #3737
Add bindings for UserActivation. #3719
Add unstable bindings for the Compression Streams API. #3752

Changed

Stabilize File System API. #3745
Stabilize QueuingStrategy. #3753

Fixed

Fixed a compiler error when using #[wasm_bindgen] inside macro_rules!. #3725

Removed

Removed Gecko-only InstallTriggerData and Gecko-internal FlexLineGrowthState, GridDeclaration, GridTrackState, RtcLifecycleEvent and WebrtcGlobalStatisticsReport features. #3723

0.2.89

Released 2023-11-27.

Added

Add additional constructor to DataView for SharedArrayBuffer. #3695
Stabilize wasm_bindgen::module(). #3690

Fixed

The DWARF section is now correctly modified instead of leaving it in a broken state. #3483
Fixed an issue where #[wasm_bindgen] automatically derived the TryFrom trait for any struct, preventing custom TryFrom<JsValue> implementations. It has been updated to utilize a new TryFromJsValue trait instead. #3709
Update the TypeScript signature of __wbindgen_thread_destroy to indicate that it's parameters are optional. #3703

Removed

Removed Gecko-internal dictionary bindings Csp, CspPolicies, CspReport and CspReportProperties. #3721

0.2.88

Released 2023-11-01

Added

Add bindings for RTCRtpTransceiverInit.sendEncodings. #3642
Add bindings for the Web Locks API to web-sys. #3604
Add bindings for ViewTransition to web-sys. #3598
Extend AudioContext with unstable features supporting audio sink configuration. #3433
Add bindings for WebAssembly.Tag and WebAssembly.Exception. #3484
Re-export wasm-bindgen from js-sys, web-sys and wasm-bindgen-futures. #3466 #3601
Re-export js-sys from web-sys and wasm-bindgen-futures. #3466 #3601
Add bindings for async variants of Atomics.wait. #3504
Add bindings for WorkerGlobalScope.performance. #3506
Add support for installing pre-built artifacts of wasm-bindgen-cli via cargo binstall wasm-bindgen-cli. #3544
Add bindings for RTCDataChannel.id. #3547
Add bindings for HTMLElement.inert. #3557
Add unstable bindings for the Prioritized Task Scheduling API. #3566
Add bindings for CssStyleSheet constructor and replace(_sync) methods. #3573
Add bindings for CanvasTransform.setTransform(DOMMatrix2DInit). #3580
Add a crate attribute to the wasm_bindgen_test proc-macro to specify a non-default path to the wasm-bindgen-test crate. #3593
Add support for passing Vecs of exported Rust types and strings to/from JS. #3554
Implement TryFrom<JsValue> for exported Rust types and strings. #3554
Handle the #[ignore = "reason"] attribute with the wasm_bindgen_test proc-macro and accept the --include-ignored flag with wasm-bindgen-test-runner. #3644
Added missing additions to the Notification API. #3667

Changed

Updated the WebGPU WebIDL. The optional message argument of GPUPipelineError's constructor has been manually specified as a required argument, because required arguments occurring after optional arguments are currently not supported by the generator. #3480
Replaced curl with ureq. By default we now use Rustls instead of OpenSSL. #3511
Changed mutability of the argument buffer in write functions to immutable for FileSystemSyncAccessHandle and FileSystemWritableFileStream. It was also automatically changed for IdbFileHandle, which is deprecated. #3537
Changed behavior when compiling to wasm32-wasi to match wasm32-emscripten and non-WASM targets, generating a stub that panics when called rather than a wasm- bindgen placeholder. #3233
Changed constructor implementation in generated JS bindings, it is now possible to override methods from generated JS classes using inheritance. When exported constructors return Self. #3562
Made wasm-bindgen forwards-compatible with the standard C ABI. #3595
Changed the design of the internal WasmAbi trait. Rather than marking a type which can be passed directly as a parameter/result to/from JS, it now lets types specify how they can be split into / recreated from multiple primitive types which are then passed to/from JS. WasmPrimitive now serves the old function of WasmAbi, minus allowing #[repr(C)] types. #3595
Use queueMicrotask in wasm-bindgen-futures for scheduling tasks on the next tick. If that is not available, use the previous Promise.then mechanism as a fallback. This should avoid quirks, like exceptions thrown get now properly reported as normal exceptions rather than as rejected promises. #3611
Improved TypeScript bindings to accurately reference Rust enum types in function signatures, enhancing type safety and compatibility. #3647
Throw an error on enum name collisions, previously only one enum would be emitted. #3669

Fixed

Fixed wasm_bindgen macro to handle raw identifiers in field names. #3621
Fixed bindings and comments for Atomics.wait. #3509
Fixed wasm_bindgen_test macro to handle raw identifiers in test names. #3541
Fixed Cargo license field to follow the SPDX 2.1 license expression standard. #3529
Use fully qualified paths in the wasm_bindgen_test macro. #3549
Fixed bug allowing JS primitives to be returned from exported constructors. #3562
Fixed optional parameters in JSDoc. #3577
Use re-exported js-sys from wasm-bindgen-futures to account for non-default path specified by the crate attribute in wasm_bindgen_futures proc-macro. #3601
Fix bug with function arguments coming from macro_rules!. #3625
Fix some calls to free() missing alignment. #3639
Fix wrong ABI for raw pointers. #3655

Removed

Removed ReadableStreamByobReader::read_with_u8_array() because it doesn't work with Wasm. #3582
Removed GetNotificationOptions, NotificationBehavior and Notification.get() because they don't exist anymore.

0.2.87

Released 2023-06-12.

Added

Implemented IntoIterator for Array. #3477

Changed

Deprecate HtmlMenuItemElement and parts of HtmlMenuElement. #3448
Stabilize ResizeObserver. #3459

Fixed

Take alignment into consideration during (de/re)allocation. #3463

0.2.86

Released 2023-05-16.

changes

0.2.85

Released 2023-05-09.

changes

0.2.84

Released 2023-02-01.

changes

0.2.83

Released 2022-09-12.

changes

0.2.82

Released 2022-07-25.

changes

0.2.81

Released 2022-06-14.

changes

0.2.80

Released 2022-04-04.

changes

0.2.79

Released 2022-01-19.

changes

0.2.78

Released 2021-09-15.

changes

0.2.77

Released 2021-09-08.

changes

0.2.76

Released 2021-08-19.

changes

0.2.75

Released 2021-08-02.

changes

0.2.74

Released 2021-05-10.

changes

0.2.73

Released 2021-03-29.

changes

0.2.72

Released 2021-03-18.

changes

0.2.71

Released 2021-02-26.

changes

0.2.70

Released 2021-01-25.

changes

0.2.69

Released 2020-11-30.

Added

Unstable bindings for WebBluetooth have been added. #2311
Unstable bindings for WebUSB have been added. #2345
Renaming a struct field with js_name is now supported. #2360
The WebGPU WebIDL has been updated. #2353

Fixed

The ImageCapture APIs of web-sys have been moved to unstable and were fixed. #2348
Bindings for waitAsync have been updated. #2362

0.2.68

Released 2020-09-08.

Added

Add userVisibleOnly property to PushSubscriptionOptionsInit. #2288

Fixed

TypeScript files now import *.wasm instead of bare files. #2283
Usage of externref now appropriately resizes the table by using 2x the previous capacity, fixing a performance issue with lots of externref objects. #2294
Compatibility with the latest Firefox WebDriver has been fixed. #2301
Non deterministic output with closures has been fixed. #2304

Updated

The WebGPU WebIDL was updated. #2267

0.2.67

Released 2020-07-28.

Added

A --reference-types flag was added to the CLI. #2257

Fixed

Breakage with Closure::forget in 0.2.66 was fixed. #2258

0.2.66

Released 2020-07-28.

Added

Reverse mappings from value to name are now available in JS bindings of enums. #2240

Fixed

Functions using a return pointer in threaded programs now correctly load and store return values in a way that doesn't interfere with other threads. #2249
Support for weak references has been updated and a --weak-refs flag is now available in the CLI for enabling weak references. #2248

0.2.65

Released 2020-07-15.

Added

Functions from JS can now be natively imported as async and will use promises under the hood. #2196

Changed

Encoding for the reference types proposal has been updated to the latest version of the spec. #2234

0.2.64

Released 2020-06-29.

Added

Nested namespaces for imports can now be specified. #2105
A deno target has been added. #2176

Fixed

Getters/setters that consume the original object have been fixed to invalidate the object correctly. #2172
Compatibility with nightly threading in LLVM has been fixed. #2183
Trailing space in generated doc comments is now removed. #2210

0.2.63

Released 2020-05-27.

Added

A new example about using WebRTC has been added. #2131
The Blob.stream() method has been added. #2140 #2142

Changed

The encoding and implementation of WebAssembly reference types has been sync'd with the latest upstream specification. #2125

Fixed

Test functions names will no longer collide with test intrinsic names. #2123
Fixed warnings with #[must_use] types in generated code. #2144
Fixed compatibility with latest Rust nightlies. #2159

0.2.62

Released 2020-05-01.

Fixed

Usage of require has been fixed with Webpack 5. #2115

0.2.61

Released 2020-04-29.

Added

Exported Rust enum types can now be renamed with js_name. #2071
More comments are copied to JS/TS files, and comments should no longer accidentally have escape sequences in them. #2070
Experimental bindings for the Clipboard browser APIs have been added. #2100

Changed

WebGPU bindings have been updated. #2080
setBindGroup methods for WebIDL now take immutable slices instead of mutable slices. #2087
JS code generation for catch functions has been improved. #2098
Usage of NPM dependencies with the web target is no longer an error. #2103

Fixed

Combining js_name with getter and setter has now been fixed. #2074
Importing global names which conflict with other namespaces should now work correctly. #2057
Acquiring the global JS object has been fixed for Firefox extension content scripts. #2099
The output of wasm-bindgen is now compatible with Webpack 5 and the updated version of the wasm ESM integration specification. #2110

0.2.60

Released 2020-03-25.

Added

The js_sys types are now more accurately reflected in TypeScript. #2028
The timeout in wasm-bindgen-test-runner's timeout can now be configured via WASM_BINDGEN_TEST_TIMEOUT. #2036
WebIDL for WebXR has been added. #2000

Changed

The WebIDL for WebGPU has been updated. #2037

0.2.59

Released 2020-03-03.

Added

The js_sys::Number type now has a number of JS-number associated constants on it now. #1965
The getTransform method on CanvasRenderingContext2D has been added. #1966
Initial experimental support was added for electron targets with a new --omit-imports flag. #1958
Optional struct fields are now reflected idiomatically in TypeScript. #1990
Typed arrays in js_sys now have get_index and set_index methods. #2001
The web_sys::Blob type has been updated with arrayBuffer and text methods. #2008
Support for unstable browser interfaces has now been added. By compiling web_sys with --cfg web_sys_unstable_apis (typically via RUSTFLAGS) you'll be able to access all bound WebIDL functions, even those like GPU support on the web, which has now also had its WebIDL updated. #1997
The compile time for web_sys has been massively reduced by pre-generating Rust code from WebIDL. It is also readable now since it generates #[wasm_bindgen] annotations instead of expanded code. #2012
A new typescript_type attribute can be used to specify the TypeScript type for an extern type. #2012
It is now possible to use string values with #[wasm_bindgen] enums. #2012
A new skip_tyepscript attribute is recognized to skip generating TypeScript bindings for a function or type. #2016

Changed

More uniformMatrix* bindings now are whitelisted take shared slice instead of a mutable slice. #1957
Non-dependency keys in package.json are now ignored instead of error'd about. #1969
WebGPU has been removed from web_sys since it was outdated and didn't work anywhere anyway. #1972
The JS heap of objects managed by wasm-bindgen has had its definition tightended up a bit. #1987
The self identifier is no longer used on the no-modules target, making it a bit more flexible in more environments. #1995
The wasm-loading logic is now more flexible and can take promises as well. #1996
JS glue for closures is now deduplicated. #2002
The web_sys crate now emits more accurate TypeScript definitions using named types instead of any everywhere. #1998
The send_with_u8_array methods in web_sys are whitelisted to take shared slices instead of mutable slices. #2015

0.2.58

Released 2020-01-07.

Added

When using the no-modules output type the initialization path for the wasm file is now optional if it can be inferred from the current JS script. #1938

Fixed

TypeScript for struct methods that have floats has been fixed. #1945

0.2.57

Released 2020-01-06.

Fixed

The js_sys::Promise type is now marked as #[must_use] #1927
Duplicate imports of the same name are now handled correctly again. #1942

0.2.56

Released 2019-12-20.

Added

Added a #[wasm_bindgen(inspectable)] attribute for exported objects to generate toJSON and toString implementations. #1876
Support for the most recent interface types proposal has been implemented. #1882
Initial support for async iterators has been added. #1895
Support for an async start function was added. #1905
Array::iter and Array::to_vec methods were added to js-sys. #1909

Fixed

Another webkit-specific WebIDL construct was fixed in web-sys. #1865

0.2.55

Released 2019-11-19.

Fixed

Running wasm-bindgen over empty anyref modules now works again. #1861
Support for multi-value JS engines has been fixed as a wasm interface types polyfill. #1863

0.2.54

Released 2019-11-07.

Added

A safe to_vec method has been added for typed arrays. #1844
A unsafe method view_mut_raw has been added to typed arrays. #1850
The HTMLImageElement WebIDL has been updated with recent features. #1842
Binary crates are now supported and fn main will be automatically executed like the start function. #1843

Changed

Some JS glue generation has been tweaked to avoid TypeScript warnings. #1852

0.2.53

Released 2019-10-29.

Fixed

A bug with the experimental support for multi-value interface types has been fixed. #1839

0.2.52

Released 2019-10-24.

Added

The support for wasm-interface-types now uses multi-value by default. #1805
The Worklet IDL has been updated. #1817
The HTMLInputElement type has selectionStart and selectionEnd properties now. #1811
An unintern function has been added to remove an interned string from the cache. #1828

Changed

Some WebIDL indexing getters have been corrected to reflect that they can throw and/or return undefined #1789

Fixed

A bug with TextDecoder and Safari has been fxied #1789

0.2.51

Released 2019-09-26.

Added

The wasm-bindgen-futures and wasm-bindgen-test crates now require Nightly Rust and have a new major version published as a result. These crates now support async/await by default, and they will be supported in the stable Rust 1.39.0 release. The previous versions of crates will continue to work on stable today. #1741
Using #[wasm_bindgen] on an async function will now work and return a Promise on the JS side of things. #1754
More helper methods for js_sys::Array have been added. #1749
Initial support for the WebAssembly multi-value proposal has been added. #1764
Constructors for js_sys::Date with optional parameters has been added. #1759
Headless tests can now be run against a remote webdriver client #1744

Changed

The passStringToWasm function has been optimized for size. #1736

Fixed

BOM markers will not be preserved when passing strings to/from wasm. #1730
Importing a static value which isn't a JsValue has been fixed. #1784
Converting undefined to a Rust value via into_serde has been fixed. #1783
Routine errors are no longer erroneously logged in debug mode. #1788

0.2.50

Released 2019-08-19.

Added

Experimental support with a WASM_INTERFACE_TYPES=1 environment variable has been added to emit a Wasm Interface Types custom section, making the output of wasm-bindgen a single standalone WebAssembly file. #1725

Fixed

Unrelated errors are now no longer accidentally swallowed by the instantiateStreaming fallback. #1723

0.2.49

Released 2019-08-14.

Added

Add binding for Element.getElementsByClassName. #1665
PartialEq and Eq are now implemented for all web-sys types. #1673
The wasm-bindgen-futures crate now has support for futures when the experimental WebAssembly threading feature is enabled. #1514
A new enable-interning feature is available to intern strings and reduce the cost of transferring strings across the JS/Rust boundary. #1612
The wasm-bindgen CLI has experimental support for reading native webidl-bindings custom sections and generating JS glue. This support is in addition to Rust's own custom sections and allows using wasm-bindgen with binaries produced by other than rustc possibly. #1690
New environment variables have been added to configure webdriver startup arguments. #1703
New JsValue::{is_truthy,is_falsy} methods are now available. #1638

Changed

JS import shims are now skipped again when they are unnecessary. #1654
WebAssembly output files now directly embed the module/name for imports if supported for the target and the import, reducing JS shims even further. #1689

Fixed

Support for threads have been updated for LLVM 9 and nightly Rust. #1675 #1688
The anyref passes in wasm-bindgen have seen a number of fixes to improve their correctness and get the full test suite running. #1692 #1704
Support for futures-preview 0.3.0-alpha.18 has been added to wasm-bindgen-futures. #1716

0.2.48

Released 2019-07-11.

Added

All typed arrays now implement From for the corresponding Rust slice type, providing a safe way to create an instance which copies the data. #1620
Function::bind{2,3,4} are now available in js-sys. #1633

Changed

More WebGL methods have been updated to use shared slices instead of mutable slices. #1639
When using the bundler target the import of the wasm file now uses the .wasm extension to ensure a wasm file is loaded. #1646
The old internal Stack trait has been removed since it is no longer used. #1624

Fixed

The js_sys::global() accessor now attempts other strategies before falling back to a Function constructor which can violate some strict CSP settings. #1650
Dropping a JsFuture no longer logs a benign error to the console. #1649
Fixed an assertion which could happen in some modules when generating bindings. #1617

0.2.47

Released 2019-06-19.

Changed

The HtmlHyperlinkElement should now include more native methods after a small edit to the WebIDL. #1604
Duplicate names for getters/setters now have a first-class wasm-bindgen error. #1605

Fixed

TypeScript definition of init with --target web now reflects that the first argument is optional. #1599
A panic with the futures 0.3 support has been fixed. #1598
More slice types are recognized as becoming immutable in some WebIDL methods. #1602
The function table is now no longer too aggressively removed. #1606

0.2.46

Released 2019-06-14.

Added

Bindings for Array#flat and Array#flatMap have been added. #1573
All #[wasm_bindgen] types now AsRef to themselves. #1583
When using --target web the path passed to init is no longer required. #1579

Fixed

Some diagnostics related to compiler errors in #[wasm_bindgen] have been improved. #1550
The support for weak references has been updated to the current JS proposal. #1557
Documentation and feature gating for web-sys dictionaries has improved. #1572
Getter and setter TypeScript has been fixed. #1577
The env_logger crate and its tree of dependencies is no longer required to build web-sys. #1586

0.2.45

Released 2019-05-20.

Fixed

Using __wbindgen_cb_forget on --target web has been fixed. #1544

Changed

More whitelists have been added for web-sys to use shared slices instead of mutable slices. #1539

0.2.44

Released 2019-05-16.

Added

Support for exporting "fields" on JS objects wrapping Rust structs which are hooked up to getters/setters has been added. This is in addition to pub struct fields and allows performing more complicated computations in getters/setters. #1440
Support for futures 0.3 (and async / await syntax) has been added to the wasm-bindgen-futures crate. #1507
Stacks of imported JS functions that throw and aren't marked catch are now logged in debug mode. #1466
A utility for counting the size of the anyref heap has been added. #1521
Passing ASCII-only strings to WASM should now be significantly faster. #1470
The selectionStart and selectionEnd APIs of text areas have been enabled. #1533

Changed

Some more methods in web-sys now take immutable slices instead of mutable ones. #1508
TypeScript bindings for Option<T> arguments now use foo? where possible. #1483

Fixed

Unnecessary bindings to __wbindgen_object_drop_ref have been fixed. #1504
Some direct imports have been fixed for --target web. #1503
Both importing and exporting the same name has been fixed. #1506
TypeScript typings for init in --target web have been fixed. #1520
Calling a dropped Closure should no longer "segfault" but produce a clear error. #1530

0.2.43

Released 2019-04-29.

Added

Support for isize and usize arrays has been added. #1448
Support customizing dyn_ref and friends via a new is_type_of attribute and apply it to some js_sys bindings. #1405 #1450 #1490
A new skip attribute to #[wasm_bindgen] has been added to skip fields and methods when generating bindings. #1410
More bindings have been added to web-sys for interfaces tagged with [NoInterfaceObject] in WebIDL. These types always fail dyn_ref and friends and must be manually casted into. #1449
Added Debug for JsFuture. #1477
Initial bindings for Atomics and SharedArrayBuffer have been added to js_sys. #1463
Bindings for Object.fromEntries has been added to js_sys. #1456
Tuple structs exported to JS now have indexed struct properties. #1467
Binding for new Function(args, body) has been added to js_sys. #1492
Bindings for some variadic functions have been added to js_sys. #1491

Changed

Many js-sys types have received various tweaks and improvements to ensure they're consistent and work similarly to native Rust types. #1447 #1444 #1473
Dummy types in js-sys only used to namespace methods were removed and now modules are used for namespacing instead. #1451
Bindings in web-sys are formatted by default for ease of usage in IDEs. #1461

Fixed

Documentation for Rust methods now show up in TypeScript as well. #1472

0.2.42

Released 2019-04-11.

Fixed

Fixed an issue in Firefox where using encodeInto accidentally caused empty strings to keep getting passed to Rust. #1434

0.2.41

Released 2019-04-10.

Added

Initial support for transitive NPM dependencies has been added. #1305
The constructor property of Object is now bound in js-sys. #1403
The Closure type now always implements Debug. #1408
Closures which take one &T argument are now supported. More implementations may be added in the future, but for now it's just one argument closures. #1417
The TypeScript bindings for --web now expose the init function. #1412
A js_sys::JsString::is_valid_utf16 method has been added to handle unpaired surrogates in JS strings. Surrounding documentation has also been updated to document this potential pitfall. #1416
A wasm_bindgen::function_table() function has been added to expose the WebAssembly.Table and get access to it in wasm code. #1431

Fixed

Reexporting the wasm_bindgen macro in crates has been fixed. #1359
Returning u32 to JS has been fixed where large u32 values would show up in JS as large negative numbers. #1401
Manual instantiation with WebAssembly.Module has been fixed. #1419
Error message for non-Copy public struct fields has been improved. #1430

Changed

Performance of passing strings to Rust in Node.js has been improved. #1391
Performance of js_sys::try_iter has been improved. #1393
Performance of using TextEncoder#encodeInto has been improved. #1414

0.2.40

Released 2019-03-21.

Added

TypeScript and JS generation will now attempt to preserve argument names in the generated JS where possible. #1344
Enable Option<T> support for enums defined in WebIDL. #1350
Add a raw_module attribute to #[wasm_bindgen] which is the same as module except doesn't attempt to recognize ./, ../, or /` prefixed paths. #1353
The wasm-bindgen CLI flags have now all been renamed under a --target flag. Instead of --web you'll now pass --target web, for example. This increases consistency between the wasm-bindgen and wasm-pack CLI. #1369

Fixed

Definitions for TypedArray imports of js-sys have been unified with a macro to improve consistency and fix future bugs. #1371
Usage of --no-modules in CloudFlare workers should now work by default. #1384
A use-after-free when a closure is reinvoked after being destroyed on the Rust die has been fixed. #1385
A bug causing nondeterministic generation of JS bindings has been fixed. #1383

0.2.39

Released 2018-03-13.

Added

Crates can now import locally written JS snippets to get bundled into the final output. See RFC 6 for more details as well as the PR. #1295

Changed

A typo in the return value of slice methods on typed arrays in js-sys was corrected. #1321
The directory specified by --out-dir is now created if it doesn't exist already. #1330

Fixed

A bug where if nom was in a crate graph and was compiled with the verbose-errors feature has been fixed. Previously the wasm-bindgen-webidl crate wouldn't compile, and now it will. #1338

0.2.38

Released 2019-03-04.

Added

Support for Option<RustStruct> in #[wasm_bindgen] functions has now been added. #1275
Experimental support for the anyref type proposal in WebAssembly has now landed and is enabled with WASM_BINDGEN_ANYREF=1. #1002
Support for the new browser TextEncode#encodeInto API has been added. #1279
JS doc comments are now added to TypeScript bindings in addition to the JS bindings generated. #1302
Initial support for FnOnce closures has been added to the Closure type. #1281

Fixed

Fixed an internal assert tripping when some modules were compiled with LTO. #1274
The Context type in the wasm-bindgen-test crate had its JS name changed to avoid conflicts with other crates that have a Context type being exported. #1280
The headless test runner for Safari on macOS High Sierra has been fixed. #1298

Changed

The wasm-bindgen CLI tool now emits the producers section again with relevant bugs having been fixed in the meantime. The --remove-producers-section flag can continue to be used to omit emission of this section. #1263

0.2.37

Released 2019-02-15.

Added

The HtmlMediaElement type now exposes a src_object getter. #1248.
The js_sys::Reflect type now has specializes getter/setters for u32 and f64 indices. #1225.
A --remove-producers-section flag has been added to the CLI tool to, well, remove the producers section from the final wasm file. #1256.

Fixed

The wasm-bindgen CLI tool will correctly strip DWARF debug information unless --keep-debug is passed. #1255.

Changed

The wasm-bindgen CLI tool no longer emits the producers custom section by default to work around a webpack bug. See #1260.

0.2.36

Released 2019-02-12.

Fixed

Fixed a bug where using closures and LTO together caused a panic inside the wasm-bindgen CLI tool. See #1244.

0.2.35

Released 2019-02-12.

Changed

wasm-bindgen now internally uses the walrus crate to perform its transformations of the wasm that rustc/LLVM emits. See #1237.

Fixed

When WebAssembly.instantiateStreaming fails due to incorrect MIME type, actually properly recover. See #1243.

0.2.34

Released 2019-02-11.

Added

Added support for optional enums. See #1214.
Added the UnwrapThrowExt<T> trait, which can enable smaller code sizes for panics. See #1219.

Fixed

Some WebGlRenderingContext methods are now whitelisted to use shared slices instead of exclusive slices. See #1199.
Fixed TypeScript definitions for optional types. See #1201.
Quiet clippy warnings inside generated code. See 1207.
Fixed using cfg_attr and wasm_bindgen together like #[cfg_attr(..., wasm_bindgen)]. See 1208.
The WebAudio example program was fixed. See #1215.
Fixed logging HTML in wasm-bindgen-test. See #1233.
When WebAssembly.instantiateStreaming fails due to incorrect MIME type, properly recover. See #1235.

0.2.33

Released 2019-01-18.

Added

Improved the Debug output of JsValue #1161
Bindings for JSON.stringify and its optional arguments have been added #1190

Fixed

A bug with windows binaries being released has ben resolved.

0.2.32

Released 2019-01-16.

Added

Added support for Web IDL sequences. This enabled bindings generation for a couple more Web APIs. We generate functions for Web APIs that take sequences to accept any iterable, and for Web APIs that return sequences, a js_sys::Array is returned. See #1152 and #1038.
The wasm-bindgen-test test runner will capture console.debug, console.info, and console.warn log messages and print them to stdout now. It already supported console.log and console.error and continues to support them. See #1183 and #1184.
Added additional --debug-only assertions in the emitted JS glue for cases where an imported JS function that is not annotated with #[wasm_bindgen(catch)] throws an exception. This should help catch some bugs earlier! See #1179.

Fixed

Fixed a bug where #[wasm_bindgen_test] tests would fail in non-headless Web browsers if they used console.log. See #1167.
Fixed a bug where returning closures from exported functions sometimes resulted in a faulty error. See #1174 and #1175.
Sometimes our generated TypeScript interface files had syntax errors in them (missing semicolons). This has been fixed. See #1181.

0.2.31

Released 2019-01-09.

Added

A new spawn_local function has been added to the wasm-bindgen-futures crate. #1148
Built-in conversions are now available from typed arrays and Rust arrays. #1147

Fixed

Some casing of dictionary properties in WebIDL has been fixed. #1155

0.2.30

Released 2019-01-07.

Added

The wasm-bindgen CLI now has an --out-name argument to name the output module. #1084
Support for importing the default export has been added. #1106

Changed

All web-sys methods are now flagged as structural, fixing a few bindings. #1117

Fixed

A small bug with LTO and closures has been fixed. #1145

0.2.29

Released 2018-12-04.

Added

Add a #[wasm_bindgen(start)] attribute to customize the start section of the wasm module. #1057
Add support for producing the new "producers" section of wasm binaries #1041
Add support a typescript_custom_section attribute for producing custom typescript abstractions #1048
Generate *.d.ts files for wasm files in addition to the JS bindings #1053
Add a feature to assert that all attributes in #[wasm_bindgen] are used to help catch typos and mistakes #1055

Changed

JS glue generation has received a few small optimizations such as removing shims and removing object allocations #1033 #1030
JS glue now just uses one array of JS objects instead of two #1069

Fixed

Fix a typo in the --no-modules generated JS #1045

0.2.28

Released 2018-11-12.

Added

The js_class support is now supported on exported types to define a different class in JS than is named in Rust #1012
More WebIDL bindings are exposed with some internal restructuring to ignore unimplemented types at a different location #1014
All imported types now implement Deref to their first extends attribute (or JsValue if one isn't listed). This is intended to greatly improve the ergonomics of web-sys bindings by allowing easy access to parent class methods #1019
A new attribute, final, can be applied to JS imports. This attribute is relatively nuanced and best explained in documentation, but is added since structural is now the default #1019

A new CLI flag, --remove-name-section, can be passed to remove the wasm name section which contains the names of functions for debugging (typically not needed in release mode) #1024

Changed

All imported functions are now structural by default. This shouldn't change the semantics of imported functions, only how they're invoked in the JS function shims that are generated by wasm-bindgen. More discussion can be founed on RFC 5 and the PR #1019

JS glue assertions for moved arguments are now only emitted in debug mode, which is still off by default #1020

Fixed

Typescript generated bindings now correctly reflect Option<T> for more types #1008
The JS shim code generation has been optimized for structural bindings (now the default) to include fewer JS shims and more easily optimizable for JS engines #1019
Passing a WebAssembly.Module to the --no-modules constructor has been fixed #1025

0.2.27

Released 2018-10-29.

Fixed

Fixed an internal panic where the gc passes were being too aggressive #995

0.2.26

Released 2018-10-29.

Added

The TypedArray.slice methods have now been bound in js-sys. #956
The Debug and Clone traits are now implemented for js_sys::Promise. #957
The js_sys::DataView type now exposes overloads to specify endianness. #966
When using --no-modules a WebAssembly.Module can now be directly passed into the instantiation glue. #969

Fixed

The JsValue type is no longer considered Send. #955
The generated JS glue is now more robust in the face of missing APIs. #959
An issue with the latest version of safaridriver used to run headless tests has been resolved. #991

0.2.25

Released 2018-10-10.

Fixed

Using wasm-bindgen will no longer unconditionally pull in Rust's default allocator for Wasm (dlmalloc) regardless if you configured a custom global allocator (eg wee_alloc). #947
Fixed web-sys build on some Windows machines. #943
Fixed generated ES class bindings to Rust structs that were only referenced through struct fields. #948

0.2.24

Released 2018-10-05.

Added

Constructors for types in web-sys should now have better documentation.
A new vendor_prefix attribute in #[wasm_bindgen] is supported to bind APIs on the web which may have a vendor prefix (like webkitAudioContext). This is then subsequently used to fix AudioContext usage in Safari.
The #[wasm_bindgen(extends = Foo)] attribute now supports full paths, so you can also say #[wasm_bindgen(extends = foo::Bar)] and such.

Changed

The Closure<T> type is now optimized when the underlying closure is a ZST. The type now no longer allocates memory in this situation.
The documentation now has a list of caveats for browser support, including how TextEncoder and TextDecoder are not implemented in Edge. If you're using webpack there's a listed strategy available, and improvements to the polyfill strategy are always welcome!
The BaseAudioContext and AudioScheduledSourceNode types in web-sys have been deprecated as they don't exist in Safari or Edge.

Fixed

Fixed the #[wasm_bindgen_test]'s error messages in a browser to correctly escape HTML-looking output.
WebIDL Attributes on Window are now correctly bound to not go through Window.prototype which doesn't exist but instead use a structural definition.
Fixed a codegen error when the BorrowMut trait was in scope.
Fixed TypeScript generation for constructors of classes, it was accidentally producing a syntactially invalid file!

0.2.23

Released 2018-09-26.

Added

This is the first release of the web-sys crate!
Added support for unions of interfaces and non-interfaces in the WebIDL frontend.
Added a policy for inclusion of new ECMAScript features in js-sys: the feature must be in stage 4 or greater for us to support it.
Added some documentation about size profiling and optimization with wasm-bindgen to the guide.
Added the Clamped<T> type for generating JavaScript Uint8ClampedArrays.
CI is now running on beta! Can't wait for the rustc release trains to roll over, so we can run CI on stable too!
Added the js_sys::try_iter function, which checks arbitrary JS values for compliance with the JS iteration protocol, and if they are iterable, converts them into an iterator over the JS values that they yield.

Changed

We now only generate null checks on methods on the JS side when in debug mode. For safety we will always null check on the Rust side, however.
Improved error messages when defining setters that don't start with set_ and don't use js_name = ....
Improved generated code for classes in a way that avoids an unnecessary allocation with static methods that return Self but are not the "main" constructor.
BREAKING: js_sys::Reflect APIs are all fallible now. This is because reflecting on Proxys whose trap handlers throw an exception can cause any of the reflection APIs to throw. Accordingly, js_sys has been bumped from 0.2.X to 0.3.X.

Fixed

The method of ensuring that __wbindgen_malloc and __wbindgen_free are always emitted in the .wasm binary, regardless of seeming reachability is now zero-overhead.

0.2.22

Released 2018-09-21

Added

The IntoIterator trait is now implemented for JS Iterator types
A number of variadic methods in js-sys have had explicit arities added.
The guide has been improved quite a bit as well as enhanced with more examples
The js-sys crate is now complete! Thanks so much to everyone involved to help fill out all the APIs.
Exported Rust functions with #[wasm_bindgen] can now return a Result where the Err payload is raised as an exception in JS.

Fixed

An issue with running wasm-bindgen on crates that have been compiled with LTO has been resolved.

0.2.21

Released 2018-09-07

Added

Added many more bindings for WebAssembly in the js-sys crate.

Fixed

The "names" section of the wasm binary is now correctly preserved by wasm-bindgen.

0.2.20

Released 2018-09-06

Added

All of wasm-bindgen is configured to compile on stable Rust as of the upcoming 1.30.0 release, scheduled for October 25, 2018.
The underlying JsValue of a Closure<T> type can now be extracted at any time.
Initial and experimental support was added for modules that have shared memory (use atomic instructions).

Removed

The --wasm2asm flag of wasm2es6js was removed because the wasm2asm tool has been removed from upstream Binaryen. This is replaced with the new wasm2js tool from Binaryen.

Fixed

The "schema" version for wasm-bindgen now changes on all publishes, meaning we can't forget to update it. This means that the crate version and CLI version must exactly match.
The wasm-bindgen crate now has a links key which forbids multiple versions of wasm-bindgen from being linked into a dependency graph, fixing obscure linking errors with a more first-class error message.
Binary releases for Windows has been fixed.

0.2.19 (and 0.2.18)

Released 2018-08-27.

Added

Added bindings to js-sys for some WebAssembly types.
Added bindings to js-sys for some Intl types.
Added bindings to js-sys for some String methods.
Added an example of using the WebAudio APIs.
Added an example of using the fetch API.
Added more extends annotations for types in js-sys.
Experimental support for WeakRef was added to automatically deallocate Rust objects when gc'd.
Added support for executing wasm-bindgen over modules that import their memory.
Added a global memory() function in the wasm-bindgen crate for accessing the JS object that represent wasm's own memory.

Removed

Removed AsMut implementations for imported objects.

Fixed

Fixed the constructor and catch attributes combined on imported types.
Fixed importing the same-named static in two modules.

0.2.17

Released 2018-08-16.

Added

Greatly expanded documentation in the wasm-bindgen guide.
Added bindings to js-sys for Intl.DateTimeFormat
Added a number of extends attributes for types in js-sys

Fixed

Fixed compile on latest nightly with latest proc-macro2
Fixed compilation in some scenarios on Windows with paths in module paths

0.2.16

Released 2018-08-13.

Added

Added the wasm_bindgen::JsCast trait, as described in RFC #2.
Added the #[wasm_bindgen(extends = ...)] attribute to describe inheritance relationships, as described in RFC #2.
Added support for receiving Option<&T> parameters from JavaScript in exported Rust functions and methods.
Added support for receiving Option<u32> and other option-wrapped scalars.
Added reference documentation to the guide for every #[wasm_bindgen] attribute and how it affects the generated bindings.
Published the wasm-bindgen-futures crate for converting between JS Promises and Rust Futures.

Changed

Overhauled the guide's documentation on passing JS closures to Rust, and Rust closures to JS.
Overhauled the guide's documentation on using serde to serialize complex data to JsValue and deserialize JsValues back into complex data.
Static methods are now always bound to their JS class, as is required for Promise's static methods.

Removed

Removed internal usage of syn's visit-mut cargo feature, which should result in faster build times.

Fixed

Various usage errors for the #[wasm_bindgen] proc-macro are now properly reported with source span information, rather than panic!()s inside the proc-macro.
Fixed a bug where taking a struct by reference and returning a slice resulted in lexical variable redeclaration errors in the generated JS glue. #662
The #[wasm_bindgen(js_class = "....")] attribute for binding methods to renamed imported JS classes now properly works with constructors.

0.2.15

Released 2018-07-26.

Fixed

Fixed wasm-bindgen CLI version mismatch checks that got broken in the last point release.

0.2.14

Released 2018-07-25.

Fixed

Fixed compilation errors on targets that use Mach-O. #545

0.2.13

Released 2018-07-22.

Added

Support the #[wasm_bindgen(js_name = foo)] attribute on exported functions and methods to allow renaming an export to JS. This allows JS to call it by one name and Rust to call it by another, for example using camelCase in JS and snake_case in Rust

Fixed

Compilation with the latest nightly compiler has been fixed (nightlies on and after 2018-07-21)

0.2.12

Released 2018-07-19.

This release is mostly internal refactorings and minor improvements to the existing crates and functionality, but the bigs news is an upcoming js-sys and web-sys set of crates. The js-sys crate will expose all global JS bindings and the web-sys crate will be generated from WebIDL to expose all APIs browsers have. More info on this soon!

Added

Support for Option<T> was added where T can be a number of slices or imported types.
Comments in Rust are now preserved in generated JS bindings, as well as comments being generated to indicate the types of arguments/return values.
The online documentation has been reorganized into a book.
The generated JS is now formatted better by default for readability.
A --keep-debug flag has been added to the CLI to retain debug sections by default. This happens by default when --debug is passed.

Fixed

Compilation with the latest nightly compiler has been fixed (nightlies on and after 2018-07-19)
Declarations of an imported function in multiple crates have been fixed to not conflict.
Compilation with #![deny(missing_docs)] has been fixed.

0.2.11

Released 2018-05-24.

0.2.10

Released 2018-05-17.

0.2.9

Released 2018-05-11.

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wasm-bindgen Change Log

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0.2.92

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0.2.91

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0.2.90

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0.2.89

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0.2.86

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0.2.83

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0.2.64

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0.2.63

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0.2.62

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0.2.61

`wasm-bindgen` Change Log