Fix bug where ESM module load fails on windows. (firebase#3692)

Patch allows Windows users to deploy Firebase Functions packaged as ES module.

We apply the same fix we made for Windows ES module support in the Functions Emulator (firebase#3574) to the triggerParser script.

Fixes firebase#3689

CHANGELOG.md

@@ -1 +1,2 @@
-- Track use of runtime config and environment variables on function deploys. (#3704)
+- Fixes bug where functions packaged as ES module failed to load on Windows. (#3692)
+- Tracks use of runtime config and environment variables on function deploys. (#3704)

src/deploy/functions/runtimes/node/triggerParser.js

@@ -2,6 +2,7 @@
 // from a functions package directory.
 "use strict";
 
+var url = require("url");
 var extractTriggers = require("./extractTriggers");
 var EXIT = function () {
   process.exit(0);
@@ -21,8 +22,10 @@ async function loadModule(packageDir) {
     return require(packageDir);
   } catch (e) {
     if (e.code === "ERR_REQUIRE_ESM") {
-      const mod = await dynamicImport(require.resolve(packageDir));
-      return mod;
+      const modulePath = require.resolve(packageDir);
+      // Resolve module path to file:// URL. Required for windows support.
+      const moduleURL = url.pathToFileURL(modulePath).href;
+      return await dynamicImport(moduleURL);
     }
     throw e;
   }