Add syscall/js (#908)

This PR adds a new package `syscall/js`. Originally `syscall/js` is for WebAssembly, but in GopherJS this package works as a wrapper of `github.com/gopherjs/gopherjs/js`. With this package, developers can use `syscall/js` both for GopherJS and WebAssembly. The implementation is basically same as `github.com/gohperjs/gopherwasm`. Fixes #899
gopherjs · Apr 30, 2019 · de1776f · de1776f
1 parent bd77b11
commit de1776f
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diff --git a/build/build.go b/build/build.go
@@ -139,6 +139,9 @@ func importWithSrcDir(bctx build.Context, path string, srcDir string, mode build
 		if installSuffix != "" {
 			bctx.InstallSuffix += "_" + installSuffix
 		}
+	case "syscall/js":
+		// There are no buildable files in this package, but we need to use files in the virtual directory.
+		mode |= build.FindOnly
 	case "math/big":
 		// Use pure Go version of math/big; we don't want non-Go assembly versions.
 		bctx.BuildTags = append(bctx.BuildTags, "math_big_pure_go")

diff --git a/compiler/gopherjspkg/fs_vfsdata.go b/compiler/gopherjspkg/fs_vfsdata.go
diff --git a/compiler/natives/fs_vfsdata.go b/compiler/natives/fs_vfsdata.go