Merge pull request #7 from xmtp/remove-yarn

Remove yarn

.github/workflows/build-test.yml

@@ -11,28 +11,17 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        node-version: [16.x, 18.x]
+        node-version: [18.x]
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
-      - name: Get Yarn cache directory
-        run: echo "::set-output name=YARN_CACHE_DIR::$(yarn cache dir)"
-        id: yarn-cache-dir
-      - name: Get Yarn version
-        run: echo "::set-output name=YARN_VERSION::$(yarn --version)"
-        id: yarn-version
-      - name: Cache yarn dependencies
-        uses: actions/cache@v2
-        with:
-          path: ${{ steps.yarn-cache-dir.outputs.YARN_CACHE_DIR }}
-          key: yarn-cache-${{ runner.os }}-${{ steps.yarn-version.outputs.YARN_VERSION }}-${{ hashFiles('yarn.lock') }}
-      - run: yarn install --immutable
-      - run: yarn build
-      - run: yarn lint
-      - run: yarn test
+      - run: npm ci
+      - run: npm run build
+      - run: npm run lint
+      - run: npm run test
   all-jobs-pass:
     name: All jobs pass
     runs-on: ubuntu-20.04