Make module types explicit and convert some to ESM (#15964)

build-scripts/gulp/app.cjs

@@ -0,0 +1,59 @@
+// Run HA develop mode
+
+const gulp = require("gulp");
+const env = require("../env.cjs");
+require("./clean.cjs");
+require("./translations.cjs");
+require("./locale-data.cjs");
+require("./gen-icons-json.cjs");
+require("./gather-static.cjs");
+require("./compress.cjs");
+require("./webpack.cjs");
+require("./service-worker.cjs");
+require("./entry-html.cjs");
+require("./rollup.cjs");
+require("./wds.cjs");
+
+gulp.task(
+  "develop-app",
+  gulp.series(
+    async function setEnv() {
+      process.env.NODE_ENV = "development";
+    },
+    "clean",
+    gulp.parallel(
+      "gen-service-worker-app-dev",
+      "gen-icons-json",
+      "gen-pages-dev",
+      "gen-index-app-dev",
+      "build-translations",
+      "build-locale-data"
+    ),
+    "copy-static-app",
+    env.useWDS()
+      ? "wds-watch-app"
+      : env.useRollup()
+      ? "rollup-watch-app"
+      : "webpack-watch-app"
+  )
+);
+
+gulp.task(
+  "build-app",
+  gulp.series(
+    async function setEnv() {
+      process.env.NODE_ENV = "production";
+    },
+    "clean",
+    gulp.parallel("gen-icons-json", "build-translations", "build-locale-data"),
+    "copy-static-app",
+    env.useRollup() ? "rollup-prod-app" : "webpack-prod-app",
+    // Don't compress running tests
+    ...(env.isTestBuild() ? [] : ["compress-app"]),
+    gulp.parallel(
+      "gen-pages-prod",
+      "gen-index-app-prod",
+      "gen-service-worker-app-prod"
+    )
+  )
+);