Merge pull request #3657 from overleaf/jpa-karma-disable-watching

[misc] disable file-watching for karma and webpack in CI

GitOrigin-RevId: bbd5a0e38ccd18475d2e04e78fc86d5dbd5a3d1a

services/web/karma.conf.js

@@ -26,6 +26,17 @@ module.exports = function(config) {
     webpack: webpackConfig,
     // Configure the webpack dev server used to serve test files
     webpackMiddleware: {
+      // Disable file-watching -- it is of no use in CI, we use single runs.
+      // https://webpack.js.org/configuration/watch/
+      watch: false,
+      // ^ does not work when placed in webpack.config.test.
+      // webpack-dev-middleware overrides it :/
+      // v seems to be supported, according to
+      // https://www.npmjs.com/package/webpack-dev-middleware#watchoptions
+      watchOptions: {
+        ignored: [/node_modules/, /frontend/, /test/]
+      },
+
       // Disable noisy CLI output
       stats: 'errors-only'
     },

services/web/package.json

@@ -22,7 +22,7 @@
     "test:frontend": "NODE_ENV=test TZ=GMT mocha --recursive --timeout 5000 --exit --grep=$MOCHA_GREP --require test/frontend/bootstrap.js test/frontend modules/*/test/frontend",
     "test:frontend:coverage": "c8 --all --include 'frontend/js' --include 'modules/*/frontend/js' --exclude 'frontend/js/vendor' --reporter=lcov --reporter=text-summary npm run test:frontend",
     "test:karma": "karma start",
-    "test:karma:single": "karma start --single-run",
+    "test:karma:single": "karma start --no-auto-watch --single-run",
     "start": "node $NODE_APP_OPTIONS app.js",
     "nodemon": "nodemon --config nodemon.json",
     "webpack": "webpack-dev-server --config webpack.config.dev.js",