npm start uses watch mode by default

for single-build dev server the new command `npm run start:single-build` is added

CHANGELOG.md

@@ -39,6 +39,8 @@ _Breaking developer changes, which may affect downstream projects or sites that
 
 #### :bug: Bugfixes
 * Fix context "edit" menu on touchscreens: render labels properly and always open the touch-specific edit menu ([#9425])
+#### :hammer: Development
+* `npm start` runs in _watch_ (i.e. `npm run start:watch`) mode by default (to start the dev server in _single build_ mode one can now use `npm run start:single-build`)
 
 [#9425]: https://github.com/openstreetmap/iD/issues/9425
 

package.json

@@ -34,7 +34,8 @@
     "imagery": "node scripts/update_imagery.js",
     "lint": "eslint scripts test/spec modules",
     "lint:fix": "eslint scripts test/spec modules --fix",
-    "start": "run-s build:js start:server",
+    "start": "run-s start:watch",
+    "start:single-build": "run-p build:js start:server",
     "start:watch": "run-p build:js:watch start:server",
     "start:server": "node scripts/server.js",
     "test": "npm-run-all -s lint build test:spec",