chore: Upload code coverage.

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
     build-and-test:
         docker:
-            - image: 'circleci/node:latest'
+            - image: "circleci/node:latest"
         steps:
             - checkout
             - restore_cache:
@@ -21,7 +21,10 @@ jobs:
                   command: yarn build
             - run:
                   name: Test
-                  command: yarn test
+                  command: yarn test --coverage
+            - run:
+                  name: Upload Test Coverage
+                  command: yarn bash <(curl -s https://codecov.io/bash)
             - save_cache:
                   paths:
                       - ~/.cache/yarn
@@ -32,7 +35,7 @@ jobs:
                       - .
     release:
         docker:
-            - image: 'circleci/node:latest'
+            - image: "circleci/node:latest"
         steps:
             - attach_workspace:
                   at: .