Fix Angular SSR deployment on Windows

fixes #6543

src/frameworks/angular/index.ts

@@ -1,4 +1,4 @@
-import { join, posix } from "path";
+import { join, posix, sep } from "path";
 import { execSync } from "child_process";
 import { spawn, sync as spawnSync } from "cross-spawn";
 import { copy, pathExists } from "fs-extra";
@@ -212,6 +212,7 @@ export async function ɵcodegenFunctionsDirectory(
 
   let bootstrapScript: string;
   if (browserLocales) {
+    const serverOutputPosixPath = serverOutputPath.split(sep).join(posix.sep);
     const locales = serverLocales?.filter((it) => browserLocales.includes(it));
     bootstrapScript = `const localizedApps = new Map();
 const ffi18n = import("firebase-frameworks/i18n");
@@ -227,8 +228,8 @@ exports.handle = function(req,res) {
     } else {
       ${
         serverEntry?.endsWith(".mjs")
-          ? `import(\`./${serverOutputPath}/\${locale}/${serverEntry}\`)`
-          : `Promise.resolve(require(\`./${serverOutputPath}/\${locale}/${serverEntry}\`))`
+          ? `import(\`./${serverOutputPosixPath}/\${locale}/${serverEntry}\`)`
+          : `Promise.resolve(require(\`./${serverOutputPosixPath}/\${locale}/${serverEntry}\`))`
       }.then(server => {
         const app = server.app(locale);
         localizedApps.set(locale, app);
@@ -238,10 +239,11 @@ exports.handle = function(req,res) {
   });
 };\n`;
   } else if (serverOutputPath) {
+    const serverOutputPosixPath = serverOutputPath.split(sep).join(posix.sep);
     bootstrapScript = `const app = ${
       serverEntry?.endsWith(".mjs")
-        ? `import(\`./${serverOutputPath}/${serverEntry}\`)`
-        : `Promise.resolve(require('./${serverOutputPath}/${serverEntry}'))`
+        ? `import(\`./${serverOutputPosixPath}/${serverEntry}\`)`
+        : `Promise.resolve(require('./${serverOutputPosixPath}/${serverEntry}'))`
     }.then(server => server.app());
 exports.handle = (req,res) => app.then(it => it(req,res));\n`;
   } else {