Dev: switch to yarn berry as package manager

.github/workflows/tests.yml

@@ -21,11 +21,11 @@ jobs:
       - uses: actions/setup-node@v5
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn --immutable
       
       - if: ${{ matrix.runner  == 'ubuntu-latest' }}
-        run: npm run lint
-      - run: npm run test-type-definitions
+        run: yarn run lint
+      - run: yarn run test-type-definitions
 
       - name: Install Chrome
         run: npx playwright install --with-deps chromium
@@ -37,4 +37,4 @@ jobs:
         run: npx playwright install --with-deps webkit
 
       - name: Run tests
-        run: npm test
+        run: yarn test

.gitignore

@@ -3,3 +3,4 @@ node_modules
 .DS_Store
 /build
 .vscode
+.yarn/install-state.gz

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-4.10.2.cjs

README.md

@@ -127,9 +127,13 @@ const sessionKey = await decryptSessionKey({
 ```
 </details>
 
-## Testing
+## Development
+Yarn is used as package manager; it comes bundled as part of the repository code.
+After checking out the repo, you can just run `yarn` to install dependencies.
+
+###  Testing
 Headless Chrome (or Chromium), Firefox and Webkit are used for the tests.
 To install any missing browsers automatically, you can run `npx playwright install --with-deps <chromium|firefox|webkit>`. Alternatively, you can install them manually as you normally would on your platform.
-If you'd like to test on a subset of browsers, use e.g. `npm test -- --browsers ChromeHeadless,FirefoxHeadless`.
+If you'd like to test on a subset of browsers, use e.g. `yarn test -- --browsers ChromeHeadless,FirefoxHeadless`.
 
 

package.json

@@ -69,5 +69,6 @@
         "web-streams-polyfill": "^3.3.3",
         "webpack": "^5.101.3",
         "webpack-cli": "^4.10.0"
-    }
+    },
+    "packageManager": "yarn@4.10.2"
 }