v0.4.0

This module has been renamed. Going forward, please use go.bytecodealliance.org instead of github.com/bytecodealliance/wasm-tools-go.

v0.3.1

Added

• wit-bindgen-go now accepts arguments that control the level of logging output on stderr. Verbose mode (-v or --verbose) will print informational log lines, warnings, and errors. Debug mode (-vv or --debug) will emit finer-grained debugging information. By default, wit-bindgen-go will print warnings or errors.
• New method (cm.Result).Result() (ok OK, err Err, isErr bool) added to streamline common patterns using result types. It has a value receiver, allowing it to be chained off a function call that returns a Result, eliminating the need to declare a temporary variable. For example: stream, err, isErr := stream.BlockingRead(n)

Fixed

• #215: generate variant accessor methods with the correct scope for Go names.

New Contributors

• @vados-cosmonic: #212 and #214 — verbose logging controls in wit-bindgen-go.

v0.3.0

Added

• Go type aliases are now generated for each WIT type alias (type foo = bar). Deep chains of type aliases (type b = a; type c = b;) are fully supported. Generated documentation now reflects whether a type is an alias. Fixes #204.
• go:wasmimport and go:wasmexport functions are now generated in a separate .wasm.go file. This helps enable testing or use of generated packages outside of WebAssembly.
• wit-bindgen-go generate now generates a WIT file for each WIT world in its corresponding Go package directory. For example the wasi:http/proxy world would generate wasi/http/proxy/proxy.wit.
• wit-bindgen-go wit now accepts a --world argument in the form of imports, wasi:clocks/imports, or wasi:clocks/[email protected]. This filters the serialized WIT to a specific world and interfaces it references. This can be used to generate focused WIT for a specific world with a minimal set of dependencies.

Changed

• Method wit.(*Package).WIT() now interprets the non-empty string name argument as signal to render in single-file, multi-package braced form.
• wit.(*Resolve).WIT() and wit.(*Package).WIT() now accept a *wit.World as context to filter serialized WIT to a specific world.
• Packages are now sorted topologically by dependency in generated WIT files. For example, wasi:cli would be followed by its dependencies like wasi:io, wasi:filesystem, or wasi:random.

v0.2.4

Added

• Generated variant shape types (...Shape) now include structs.HostLayout.

v0.2.3

Added

• wit-bindgen-go generate now accepts a remote registry reference to pull down a WIT package and generate the Go code. Example: wit-bindgen-go generate ghcr.io/webassembly/wasi/http:0.2.0.

Changed

• cm.List now stores list length as a uintptr, permitted by the Go wasm types proposal. It was previously a uint, which was removed from the list of permitted types. There should be no change in the memory layout in TinyGo GOARCH=wasm or Go GOARCH=wasm32 using 32-bit pointers.
• The helper functions cm.NewList, cm.LiftList, and cm.LiftString now accept any integer type for len, defined as cm.AnyInteger.
• cm.Option[T].Value() method now value receiver (not pointer receiver), so it can be chained.

v0.2.2

Added

• All struct types in package cm now include structs.HostLayout on Go 1.23 or later.
• Added type constraints AnyList, AnyResult, and AnyVariant in package cm to constrain generic functions accepting any of those types.
• Variant types now implement fmt.Stringer, with a String method. Breaking: variant cases named string map to String_ in Go.
• cm.Option[T] types now have a Value() convenience method that returns the zero value for T if the option represents the none case. For example, this simplifies getting an empty string or slice from option<string> or option<list<T>>, respectively.
• Added a release workflow to publish tagged releases to GitHub.

Fixed

• wit-bindgen-go --version now displays the version without empty ().

v0.2.1

Added

• Generated structs and structs in package cm now include a HostLayout field in order to conform with the relaxed types proposal for GOARCH=wasm32. The cm.HostLayout type is an alias for structs.HostLayout on Go 1.23 or later, and a polyfill for Go 1.22 or earlier.
• #163: added cm.F32ToU64() and cm.U64ToF32() for flattening f32 and u64 types in the Canonical ABI.
• Test data from bytecodealliance/wit-bindgen/tests/codegen.

Fixed

• #159: correctly escape all WIT keywords, including when used in package names.
• #160: fixed the use of Go reserved keywords in function returns as result types.
• #161: correctly handle constructor as a WIT keyword in wit.
• #165: fixed use of imported types in exported functions.
• #167: fixed a logic flaw in TestHasBorrow.
• #170: resolve implied names for interface imports and exports in a world.
• #175: generated correct symbol names for imported and exported functions in worlds ($root) or interfaces declared inline in worlds.

v0.2.0

This project has moved! wasm-tools-go is now an official Bytecode Alliance project.

Going forward, please update your Go imports from github.com/ydnar/wasm-tools-go to github.com/bytecodealliance/wasm-tools-go. Thanks to @ricochet, @mossaka, @lxfontes, and others for their help making this possible.

Changed

• Added support for @deprecated directive implemented in wasm-tools#1687.
• Removed support for @since feature gating implemented in wasm-tools#1741.

Fixed

• #151: backport support for JSON generated by wasm-tools prior to v1.209.0, which added @since and @unstable feature gates.

v0.1.5

Added

• wit-bindgen-go --version now reports the module version and git revision of the wit-bindgen-go command.

Changed

• Omit the default //go:build !wasip1 build tags from generated Go files. This enables wit-bindgen-go to target GOOS=wasip1 (fixes #147).
• Package wit now serializes multi-package WIT files with an un-nested “root” package. See WebAssembly/component-model#380 and bytecodealliance/wasm-tools#1700.

v0.1.4

Added

• wit-bindgen-go generate now accepts a --cm option to specify the Go import path to package cm. Used for custom or internal implementations of package cm. Defaults to github.com/ydnar/wasm-tools-go/cm.
• Tuple9...Tuple16 types in package cm to align with component-model#373. Tuples with 9 to 16 types will no longer generate inline struct types.
• Documentation for Canonical ABI lift and lower helper functions in package cm.

Changed

• Removed outdated documentation in design.