internal/filepathlite: use host node.js function to parse path in wasm

misc/wasm/wasm_exec.js

@@ -77,7 +77,19 @@
 		globalThis.path = {
 			resolve(...pathSegments) {
 				return pathSegments.join("/");
-			}
+			},
+			isAbsolute(path) {
+				return path[0] === "/";
+			},
+			parse(path) {
+				return {
+					root: "/"
+				}
+			},
+			normalize(path) {
+				return path;
+			},
+			sep: "/",
 		}
 	}
 

src/internal/filepathlite/path_js_wasm.go

@@ -0,0 +1,36 @@
+// Copyright 2024 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build js && wasm
+
+package filepathlite
+
+import "syscall/js"
+
+func IsPathSeparator(c uint8) bool {
+	return c == '\\' || c == '/'
+}
+
+var jsPath = js.Global().Get("path")
+
+var (
+	Separator = jsPath.Get("sep").String()[0]
+)
+
+func isLocal(path string) bool {
+	return !jsPath.Call("isAbsolute", path).Bool()
+}
+
+func localize(path string) (string, error) {
+	return jsPath.Call("normalize", path).String(), nil
+}
+
+func IsAbs(path string) bool {
+	return jsPath.Call("isAbsolute", path).Bool()
+}
+
+func volumeNameLen(path string) int {
+	length := jsPath.Call("parse", path).Get("root").Get("length").Int()
+	return max(0, length-1)
+}

src/internal/filepathlite/path_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm) || wasip1
+//go:build unix || wasip1
 
 package filepathlite