Build as part of CI workflow

.github/workflows/continuous-integration-workflow.yml

@@ -7,7 +7,7 @@ on:
     branches: [main]
 
 jobs:
-  lint:
+  ci:
     runs-on: ubuntu-latest
 
     steps:
@@ -19,16 +19,23 @@ jobs:
         with:
           node-version: "12.x"
 
-      # This is needed because lerna expects loom-common to be an npm package (which it only is if it has a package.json file)
+      # As part of this, we have to copy loom-common's `package.json` to its `out` folder.
+      # This is needed because lerna expects loom-common/out to be an npm package (which it only is if it has a package.json file)
       # Normally, this is done as part of the build process, but it also needs to be done for a fresh install.
-      - name: Setup loom-common
-        run: mkdir -p loom-common/out && cp loom-common/package.json loom-common/out
-
       - name: Install dependencies
-        run: npm install
+        run: |
+          mkdir -p loom-common/out
+          cp loom-common/package.json loom-common/out
+          npm install
 
       - name: Lint
         run: npm run lint
 
+      # This step has two purposes:
+      # 1. Typecheck everything by putting it through tsc
+      # 2. Build loom-common, which is needed by loom-editor and loom-extension tests
+      - name: Typecheck and Build
+        run: npm run build
+
       - name: Tests
         run: npm run test