*: support compilation under js/wasm

Author: mcuadros

.github/workflows/test_js.yml

@@ -0,0 +1,27 @@
+on: [push, pull_request]
+name: Test
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [1.14.x, 1.15.x, 1.16.x]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.go-version }}
+
+    - name: Install wasmbrowsertest
+      run: |
+        go get github.com/agnivade/wasmbrowsertest
+        mv ~/go/bin/wasmbrowsertest ~/go/bin/go_js_wasm_exec
+
+    - name: Checkout code
+      uses: actions/checkout@v2
+
+    - name: Test
+      run: go test -exec="$HOME/go/bin/go_js_wasm_exec" ./...
+      env:
+        GOOS: js
+        GOARCH: wasm

go.sum

@@ -1,8 +1,5 @@
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/go-git/go-billy v1.0.0 h1:bXR6Zu3opPSg0R4dDxqaLglY4rxw7ja7wS16qSpOKL4=
-github.com/go-git/go-billy v3.1.0+incompatible h1:dwrJ8G2Jt1srYgIJs+lRjA36qBY68O2Lg5idKG8ef5M=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
-github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=

osfs/os.go

@@ -1,3 +1,5 @@
+// +build !js
+
 // Package osfs provides a billy filesystem for the OS.
 package osfs // import "github.com/go-git/go-billy/v5/osfs"
 

osfs/os_posix.go

@@ -1,4 +1,4 @@
-// +build !plan9,!windows
+// +build !plan9,!windows,!js
 
 package osfs
 

osfs/os_test.go

@@ -1,3 +1,5 @@
+// +build !js
+
 package osfs
 
 import (

osfs/os_unsupported.go

@@ -0,0 +1,11 @@
+// +build js
+
+package osfs
+
+import (
+	"github.com/go-git/go-billy/v5"
+)
+
+func New(string) billy.Filesystem {
+	panic("unsupported arch or os")
+}