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README: document the current GOOS and GOARCH values #1180

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Jan 3, 2023
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README: document the current GOOS and GOARCH values #1180

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4 changes: 3 additions & 1 deletion README.md
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Expand Up @@ -155,7 +155,9 @@ For more details see [Jason Stone's blog post](http://legacytotheedge.blogspot.d

#### General

GopherJS emulates a 32-bit environment. This means that `int`, `uint` and `uintptr` have a precision of 32 bits. However, the explicit 64-bit integer types `int64` and `uint64` are supported. The `GOARCH` value of GopherJS is "js". You may use it as a build constraint: `// +build js,-wasm`.
GopherJS emulates a 32-bit environment. This means that `int`, `uint` and `uintptr` have a precision of 32 bits. However, the explicit 64-bit integer types `int64` and `uint64` are supported.

The `GOOS` value of this environment is `js`, and the `GOARCH` value is `ecmascript`. You may use these values in build constraints when [writing platform-specific code](doc/compatibility.md#how-to-write-portable-code). (GopherJS 1.17 and older used `js` as the `GOARCH` value.)

#### Application Lifecycle

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2 changes: 1 addition & 1 deletion doc/compatibility.md
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Expand Up @@ -58,7 +58,7 @@ Also be careful about using GopherJS-specific packages (e.g. `github.com/gopherj

GopherJS implements `syscall/js` package, so it _should_ be able to run most code written for WebAssembly. However, in practice this topic is largely unexplored at this time.

It is worth noting that GopherJS emulates 32-bit environment, whereas Go WebAssembly is 64 bit, so you should use fixed-size types if you need to guarantee consistent behavior between the two architectures.
It is worth noting that Go predeclares both architecture-independent [numeric types](https://go.dev/ref/spec#Numeric_types) (`int32`, `int64`, etc.) and ones with implementation-specific sizes (`int`, `uintptr`, etc.). Pay attention to this distinction to avoid portability issues between 32-bit and 64-bit platforms.

🚧 If you have first-hand experience with this, please consider adding it to this section!

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