Test against Node 16

* Replaced node-sass dependency that isn't compatible with Node 16
* Added Node 16 to CI matrix
* Fixes #1894

.circleci/config.yml

@@ -7,6 +7,10 @@ orbs:
   node: circleci/node@3.0.0
 
 executors:
+  node16:
+    docker:
+      - image: cimg/node:16.1.0-browsers
+    working_directory: ~/workspace
   node14:
     docker:
       - image: circleci/node:14
@@ -108,6 +112,9 @@ workflows:
                  - "3.99"
                  - "4.0"
     jobs:
+      - build:
+          executor: node16
+          name: build_node_16
       - build:
           executor: node14
           name: build_node_14
@@ -117,6 +124,11 @@ workflows:
       - build:
           executor: node10
           name: build_node_10
+      - test_node:
+          executor: node16
+          name: test_node_16
+          requires:
+             - build_node_16
       - test_node_with_long_property_tests:
           executor: node14
           requires:
@@ -139,6 +151,9 @@ workflows:
               ignore: /pull\/.*/ # Don't run on pull requests.
   push:
     jobs:
+      - build:
+          executor: node16
+          name: build_node_16
       - build:
           executor: node14
           name: build_node_14
@@ -148,6 +163,11 @@ workflows:
       - build:
           executor: node10
           name: build_node_10
+      - test_node:
+          executor: node16
+          name: test_node_16
+          requires:
+             - build_node_16
       - test_node:
           executor: node14
           name: test_node_14