Make build script happier on windows

Author: joshuafcole

scripts/build.ts

@@ -62,18 +62,21 @@ export function build(callback:() => void) {
   // Copy static JS files into build.
   let matches = glob.sync("src/*.js");
   for(let match of matches) {
-    let relative = match.split("/").slice(1).join("/");
-    copy(match, "build/src/" + relative, tracker.track("copy static files"));
+    let relative = match.split(path.sep).slice(1).join(path.sep);
+    copy(match, path.join("build", "src", relative), tracker.track("copy static files"));
   }
 
   // Copy node dependencies required by the browser.
   let deps = [
     "node_modules/chevrotain/lib/chevrotain.js"
   ];
   for(let dep of deps) {
+    if(path.sep !== "/") {
+      dep = dep.replace("/", path.sep);
+    }
     dep = path.resolve(dep);
-    let base = dep.split("/").pop();
-    copy(dep, "build/src/" + base, tracker.track("copy node module files"));
+    let base = dep.split(path.sep).pop();
+    copy(dep, path.join("build", "src", base), tracker.track("copy node module files"));
   }
 
   // Package workspaces.